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The Influence of Age Hardening and Shot Peening on the Surface
materials Article The Influence of Age Hardening and Shot Peening on the Surface Properties of 7075 Aluminium Alloy Sebastjan Žagar 1, Boštjan Markoli 2, Iztok Nagliˇc 2 and Roman Šturm 1,* 1 Faculty of Mechanical Engineering, Aškerˇceva6, 1000 Ljubljana, Slovenia; [email protected] 2 Faculty of Natural Sciences and Engineering, Aškerˇceva12, 1000 Ljubljana, Slovenia; [email protected] (B.M.); [email protected] (I.N.) * Correspondence: [email protected]; Tel.: +386-14-771-203 Abstract: The present study investigates the effect of shot peening (SP) on the mechanical properties and surface roughness of 7075 aluminum alloy during different stages and conditions of heat treatment. The mechanical properties were determined by measuring Vickers microhardness profiles and residual stress profiles, while the amount of alloying elements present in the solid solution of the samples under different heat treatment conditions was determined by measuring the electrical conductivity. The results show that the increase in microhardness near the SP surface and the maximum compressive residual stresses are mainly related to the content of alloying elements in the solid solution. Surface roughness increases with increasing SP Almen intensity, and samples with the highest microhardness and residual stresses have the lowest surface roughness. Keywords: aluminum alloy 7075; shot peening; microhardness; residual stresses; surface roughness Citation: Žagar, S.; Markoli, B.; Nagliˇc,I.; Šturm, R. The Influence of 1. Introduction Age Hardening and Shot Peening on Aluminum alloy 7075 is widely used in automotive and aerospace industries due to its the Surface Properties of 7075 high strength and light weight [1]. -
On Mechanical Properties of Aluminum Alloys
Technical Journal, University of Engineering and Technology (UET) Taxila, Pakistan Vol. 25 No. 1-2020 ISSN:1813-1786 (Print) 2313-7770 (Online) The Effect of Filler Materials (Al 4047 and Al 5356) on Mechanical Properties of Aluminum Alloys (AA6061-O and Heat-Treated AA7075-T6) in Tungsten Inert Gas (TIG) Dissimilar Metal Welding A.Batool1, N.A.Anjum2, H.Jawaid3 1,2,3Department of Mechanical Engineering, University of Engineering & Technology, Taxila, Pakistan 2 [email protected] Abstract- The purpose of the current work is to any other Alloy. investigate the combined effect of thickness and the As compared to other alloys of aluminum, the 6061 mechanical properties of dissimilar aluminum alloys series Al-alloys have been examined broadly due to annealed AA6061-O and heat-treated AA7075-T6 on their attributes like medium strength, better weld- the tensile strength of the joint. The joint is made by ability, formability, good corrosion resistance and Tungsten Inert Gas (TIG) welding using suitable fillers reduced cost of Aluminum alloy 6061 is one of the most Al 4047 and Al 5356. Different samples i.e. Welded utilized of the 6000 series aluminum alloys [2]. It is a Over-Nugget Sample (WOS), Welded Ground Sample versatile heat treatable alloy with intermediate to (WGS) and Base Material (BM) were investigated advanced strength capabilities [3]. The 6061 under tensile loading. In order to avoid failure, the Aluminum alloys are extensively used in the thickness of weak strength AA6061-O must be greater fabrication of several Aircraft and aerospace as compared to the thickness of AA7075 comprising components, transport and bicycle frames, marine high strength in order to balance stresses on both sides. -
Stress Corrosion Cracking of Friction Stir-Welded AA-2024 T3 Alloy
materials Article Stress Corrosion Cracking of Friction Stir-Welded AA-2024 T3 Alloy Marina Cabrini 1,2,3 , Sara Bocchi 4 , Gianluca D’Urso 4, Claudio Giardini 4 , Sergio Lorenzi 1,2,3,* , Cristian Testa 1,2,3 and Tommaso Pastore 1,2,3 1 Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine (BG), Italy; [email protected] (M.C.); [email protected] (C.T.); [email protected] (T.P.) 2 National Interuniversity Consortium of Materials Science and Technology (INSTM) Research Unit of Bergamo, 24044 Dalmine (BG), Italy 3 Center for Colloid and Surface Science (CSGI) Research Unit of Bergamo, 24044 Dalmine (BG), Italy 4 Information and Production Engineering, Department of Management, University of Bergamo, 24044 Dalmine (BG), Italy; [email protected] (S.B.); [email protected] (G.D.); [email protected] (C.G.) * Correspondence: [email protected] Received: 2 May 2020; Accepted: 3 June 2020; Published: 8 June 2020 Abstract: The paper is devoted to the study of stress corrosion cracking phenomena in friction stir welding AA-2024 T3 joints. Constant load (CL) cell and slow strain rate (SSR) tests were carried out in aerated NaCl 35 g/L solution. During the tests, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were measured in the different zones of the welding. The results evidenced initial practical nobilty of the nugget lower compared to both heat-affected zone and the base metal. This effect can be mainly ascribed to the aluminum matrix depletion in copper, which precipitates in form of copper-rich second phases. -
Surface Deformation and Rebound for Normal Single-Particle Collisions in a Surrounding fluid
J. Fluid Mech. (2019), vol. 871, pp. 1044–1066. c Cambridge University Press 2019 1044 doi:10.1017/jfm.2019.349 Surface deformation and rebound for normal single-particle collisions in a surrounding fluid https://doi.org/10.1017/jfm.2019.349 . Angel Ruiz-Angulo1, Shahrzad Roshankhah2 and Melany L. Hunt2,† 1Icelandic Meteorological Office, 108 Reykjavík, Iceland 2Division of Engineering and Applied Science, California Institute of Technology, 1200 E. California Blvd., MC 104-44, Pasadena, CA 91125, USA (Received 21 December 2018; revised 4 March 2019; accepted 23 April 2019; first published online 3 June 2019) This article presents experimental measurements involving immersed collisions https://www.cambridge.org/core/terms between a rigid impactor and a deformable target for a wide range of Reynolds and Stokes numbers. Three aluminium alloys are used as solid targets submerged in seven different fluids covering a wide range of viscosity and density. The collision and rebound velocities as well as the depth and diameter of the crater produced by the collisions are measured with high resolution. Most of the experiments in this study occur at velocities for which the deformation is within the elastic–plastic regime. Results of the experiments in air are analysed by elastic, plastic and elastic–plastic theories, and demonstrate the complexities of modelling elastic–plastic collisions. For collisions in a liquid, the measurements show that the size of the crater is independent of the fluid characteristics if the Stokes number is beyond a critical value. The normal coefficient of restitution can be estimated by including both viscous losses and plasticity effects and assuming that the collision time scale is significantly shorter than the hydrodynamic time scale. -
Effect of Post Weld Heat Treatment on Aluminium Alloys
ISSN(Online): 2319-8753 ISSN (Print): 2347-6710 International Journal of Innovative Research in Science, Engineering and Technology (A High Impact Factor, Monthly, Peer Reviewed Journal) Visit: www.ijirset.com Vol. 7, Issue 12, December 2018 Effect of Post Weld Heat Treatment on Aluminium Alloys Sanket V Bhosale1, Vijay J Dhembare2, Jaydeep M Khade3, Department of Production Engineering, D Y Patil College of Engineering, Akurdi, Pune, India1,2,3 ABSTRACT:In this paper, the effect of post-weld heat treatment (PWHT) on mechanical properties and change in microstructure of friction stir welded 2024 and 7075 aluminum alloys are studied. Solution heat treatment and various ageing treatments were given to the welded joints. The PWHT procedures caused abnormal coarsening of the grains in the weld zone, which resulted in a drop in micro-hardness at the weld zone compared to the base material of the joints. Another objective of this work is to study effect of Post Weld Heat Treatment on hardness and tensile properties of material. To gate optimum result, hardness and tensile properties of parent material, welded material and heat treated material is compared. Vickers micro hardness test is used to study hardness of samples. KEYWORDS: Friction Stir Welding, Microstructure, aluminium, heat treatment. I. INTRODUCTION Today aluminium alloys are widely used in many manufacturing areas like aerospace, railways, military and automobile sector. Aluminium has low density and good mechanical properties as compared to other metals. Welding is widely used method for joining the alloys of aluminium. But welding of aluminium alloy is big challenge for designers because of oxide layer cavity and hot cracking sensitivity of aluminium alloy. -
(11604843) Under the Guidance of Mr. Piyush Gulati Asst. Professor
Evaluating the effects of reinforcement particles on mechanical and metallurgical properties of friction stir processed aluminum alloy composites Dissertation-II Submitted in partial fulfillment of the requirement for the award of degree Of MASTER OF TECHNOLOGY In MECHANICAL ENGINEERING By Kaushal Kumar (11604843) Under the guidance of Mr. Piyush Gulati Asst. Professor SCHOOL OF MECHANICAL ENGINEERING LOVELY PROFESSIONAL UNIVERSITY PUNJAB TOPIC APPROVAL PERFORMA School of Mechanical Engineering Program : P17H::M.Tech. (Design) [Full Time] COURSE CODE: MEC604 REGULAR/BACKLOG: Regular GROUP NUMBER : MERGD0013 Supervisor Name: Piyush Gulati UID:14775 Designation : Assistant Professor Qualification:________________________ Research Experience : ________________________ SR.NO. NAME OF STUDENT REGISTRATION NO BATCH SECTION CONTACT NUMBER 1 Kaushal Kumar 11604843 2016 M1671 8559999054 SPECIALIZATION AREA : Design Supervisor Signature:___________________ PROPOSED TOPIC : Evaluating the effects of reinforcement particles on mechanical and metallurgical properties of friction stir processed aluminum alloy composites Qualitative Assessment of Proposed Topic by PAC Sr.No. Parameter Rating (out of 10) 1 Project Novelty: Potential of the project to create new knowledge 7.50 2 Project Feasibility: Project can be timely carried out in-house with low-cost and available 7.00 resources in the University by the students. 3 Project Academic Inputs: Project topic is relevant and makes extensive use of academic 7.50 inputs in UG program and serves as a culminating effort for core study area of the degree program. 4 Project Supervision: Project supervisor’s is technically competent to guide students, 7.00 resolve any issues, and impart necessary skills. 5 Social Applicability: Project work intends to solve a practical problem. 6.50 6 Future Scope: Project has potential to become basis of future research work, publication 7.50 or patent. -
Corrosion Behavior of 2024 Aluminum Alloys Structure Produced by Wire Arc Additive Manufacture
Corrosion Behavior of 2024 Aluminum Alloys Structure produced by Wire Arc Additive Manufacture A dissertation submitted to the University of the Manchester for the degree of MSc by Research In the Faculty of Engineering and Physical Sciences 2017 SIHAN TAN School of Materials Corrosion and Protection Centre Table of Contents List of figures ............................................................................................................................. 3 List of tables .............................................................................................................................. 5 Abstract ..................................................................................................................................... 6 Declaration .................................................................................................................................... 7 Copyright Statement ..................................................................................................................... 8 Acknowledgement ........................................................................................................................ 9 1 Introduction ........................................................................................................................ 10 2 Literature review ................................................................................................................. 12 2.1 History of AM ............................................................................................................. -
Mechanical and Tribological Properties of Al7475-Sicp Composites by Stir Casting Method and Wear Rate Modeling Using RSM
Sådhanå (2019) 44:129 Ó Indian Academy of Sciences https://doi.org/10.1007/s12046-019-1105-1Sadhana(0123456789().,-volV)FT3](0123456789().,-volV) Mechanical and tribological properties of Al7475-SiCp composites by stir casting method and wear rate modeling using RSM K SEKAR Department of Mechanical Engineering, National Institute of Technology Calicut, Calicut 673601, India e-mail: [email protected] MS received 21 July 2018; revised 26 December 2018; accepted 7 March 2019; published online 29 April 2019 Abstract. The microstructure, mechanical and wear properties of the Al 7475-SiCp composites and to investigate the effects of SiC micro-particles reinforcement with alloy have been studied. Al 7475-SiCp com- posites have been developed by a stir casting method. The SiCp size in the range of 15–40 lm with weight.% of 0, 5, 10 and 15 were injected in molten Aluminum 7475 alloy in argon gas environment and stirrer using a mechanical method at 450 rpm to ensure uniform distribution of SiC particles. The mechanical properties such as hardness and compressive strength of the composites were found to be gradually improved with the addition of 5–15% SiCp reinforcement. The ultimate tensile and impact strength increased with 10% of SiCp rein- forcement. For modeling the wear rate, the experiments were conducted in Pin-on Disc tribometer at room condition. A three-level central composite design with response surface methodology was used to reduce the experimental conditions and to predict the abrasive response of wear rate through the development of mathe- matical models. The model developed is efficiently predicted the rate of wear at 95% confidence level and the entire model validate with analysis of variance. -
Influence of the Microstructure on the Corrosion Behaviour of 2024 Aluminium Alloy Coated with a Trivalent Chromium Conversion Layer
OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible This is an author’s version published in: http://oatao.univ-toulouse.fr/21412 Official URL: https://doi.org/10.1016/j.corsci.2018.07.007 To cite this version: Saillard, Romain and Viguier, Bernard and Odemer, Grégory and Pugliara, Alessandro and Fori, Benoit and Blanc, Christine Influence of the microstructure on the corrosion behaviour of 2024 aluminium alloy coated with a trivalent chromium conversion layer. (2018) Corrosion Science, 142. 119-132. ISSN 0010-938X Any correspondence concerning this service should be sent to the repository administrator: [email protected] Influence of the microstructure on the corrosion behaviour of 2024 aluminium alloy coated with a trivalent chromium conversion layer ⁎ R. Saillarda, B. Viguiera, G. Odemera, A. Pugliaraa, B. Forib, C. Blanca, a CIRIMAT, Université de Toulouse, CNRS, INP-ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse Cedex 4, France b MECAPROTEC Industries, 34 Boulevard de Joffrery, BP 30204, 31605 Muret Cedex, France ARTICLEINFO ABSTRACT Keywords: The influence of 2024 aluminium alloy microstructure on the protective properties of trivalent chromium A. Aluminium process (TCP) coatings was studied: samples aged at 190 °C were analysed by comparison to a T3 state. The A. Copper surface Cu coverage after deoxidation was higher for long-aged samples because nanometer scale Cu-rich pre- A. Intermetallics cipitates formed during ageing behaved as distinct electrochemical entities and contributed to the formation of A. Metal coatings copper deposits. The growth mechanisms and kinetics of TCP coatings were directly related to the surface Cu B. -
Mechanical Properties of 7075 Aluminium Matrix Composites Reinforced by Nanometric Silicon Carbide Particulates
Mechanical Properties of 7075 Aluminium Matrix Composites Reinforced by Nanometric Silicon Carbide Particulates By Zheng Ren A thesis submitted for the Degree of Master of Engineering School of Materials Science and Engineering Faculty of Science University of New South Wales September 2007 PLEASE TYPE THE UNIVERSITY OF NEW SOUTH WALES Thesis/Dissertation Sheet Surname or Family name: Ren First name: Zheng Other name/s: Abbreviation for degree as given in the University calendar: ME School: Materials Science and Engineering Faculty: Faculty of Science Title: Mechanical Properties of 7075 Aluminium Matrix Composites Reinforced by Nanometric Silicon Carbide Particulates Abstract 350 words maximum: (PLEASE TYPE) Aluminium composites reinforced by particles have received considerable attention because of their superior mechanical properties over monolithic aluminum matrix. Over the last ten years, nanocomposites with nano-sized reinforcements have become a revolutionary progress for composites because they have different strengthening mechanisms as compared to that in composites with micro-sized reinforcements. Consequently novel properties can be expected from the nanometric particulate reinforced composites. The aim of this project was to fabricate SiC (50nm)/7075 aluminium composites via a modified powder metallurgy and extrusion route. Ageing treatment was used to increase the strength of the composites and mechanical tests, including tensile test and abrasive wear test, were performed. The effects of nanometric silicon carbide particulates to the ageing behaviours and mechanical properties of the composites have been studied by optical metallography, scanning electron microscopy and transmission electron microscopy. It was found that the dispersion of nanometric silicon carbide was not homogeneous, but tended to disperse along grain boundaries. -
Durability and Corrosion of Aluminium and Its Alloys: Overview, Property Space, Techniques and Developments
Chapter 2 Durability and Corrosion of Aluminium and Its Alloys: Overview, Property Space, Techniques and Developments N. L. Sukiman, X. Zhou, N. Birbilis, A.E. Hughes, J. M. C. Mol, S. J. Garcia, X. Zhou and G. E. Thompson Additional information is available at the end of the chapter http://dx.doi.org/10.5772/53752 1. Introduction Aluminium (Al) is an important structural engineering material, its usage ranking only behind ferrous alloys (Birbilis, Muster et al. 2011). The growth in usage and production of Al continues to increase (Davis 1999). The extensive use of Al lies in its strength:density ratio, toughness, and to some degree, its corrosion resistance. From a corrosion perspec‐ tive, which is most relevant to this chapter, Al has been a successful metal used in a num‐ ber of applications from commodity roles, to structural components of aircraft. A number of Al alloys can be satisfactorily deployed in environmental/atmospheric conditions in their conventional form, leaving the corrosion protection industry to focus on market needs in more demanding applications (such as those which require coating systems, for example, the aerospace industry). Relatively pure aluminium presents good corrosion resistance due to the formation of a bar‐ rier oxide film that is bonded strongly to its surface (passive layer) and, that if damaged, re- forms immediately in most environments; i.e. re-passivation (Davis 1999). This protective oxide layer is especially stable in near-neutral solutions of most non-halide salts leading to excellent pitting resistance. Nevertheless, in open air solutions containing halide ions, with Cl- being the most common, aluminium is susceptible to pitting corrosion. -
Effect of Actual and Accelerated Ageing on Microstructure Evolution and Mechanical Properties of a 2024-T351 Aluminium Alloy
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Open Archive Toulouse Archive Ouverte Open Archive Toulouse Archive Ouverte (OATAO) OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in: http://oatao.univ-toulouse.fr/ Eprints ID: 18653 To link to this article: DOI:10.1016/j.ijfatigue.2017.10.015 URL: http://dx.doi.org/10.1016/j.ijfatigue.2017.10.015 To cite this version: Prudhomme, Manida and Billy, François and Alexis, Joël and Benoit, Guillaume and Hamon, Florence and Larignon, Céline and Odemer, Grégory and Blanc, Christine and Hénaff, Gilbert Effect of actual and accelerated ageing on microstructure evolution and mechanical properties of a 2024-T351 aluminium alloy. (2018) International Journal of Fatigue, vol. 107. pp. 60-71. ISSN 0142-1123 Any correspondence concerning this service should be sent to the repository administrator: [email protected] Effect of actual and accelerated ageing on microstructure evolution and mechanical properties of a 2024-T351 aluminium alloy M. Prudhommea,b, F. Billya, J. Alexisc, G. Benoita, F. Hamona, C. Larignonb, G. Odemerb, C. Blancb and G. Hénaffa, * a Pprime Institute, UPR 3346 CNRS-ENSMA-Université de Poitiers, ISAE-ENSMA, 1 avenue Clément Ader, 86961 Futuroscope Chasseneuil, France b CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, ENSIACET, 4, allée Emile Monso BP 44362, 31030 Toulouse Cedex 4, France c LGP, ENIT, 47 avenue d'Azereix - BP 1629 - 65016 Tarbes CEDEX, France Abstract Due to the increasing number of civil transport aircrafts that come close to the end of the initial design life, airliners as well as aircraft manufacturers have to face different challenges.