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Development of Magnesium Powder Metallurgy AZ31 Alloy Using Commercially Available Powders

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Development of Magnesium Powder Metallurgy AZ31 Alloy Using Commercially Available Powders High Temp. Mater. Proc., Vol. 30 (2011), pp. 51–61 Copyright © 2011 De Gruyter. DOI 10.1515/HTMP.2011.007 Development of Magnesium Powder Metallurgy AZ31 Alloy Using Commercially Available Powders Paul Burke1 and Georges J. Kipouros2; 1 Introduction In the past quarter century the increasing cost of energy and 1 Massachusetts Institute of Technology, Department increased environmental awareness has lead to a global re- of Materials Science and Engineering, Cambridge, quirement for the reduction of automotive emissions. One Masachusetts, U.S.A. strategy for the reduction of emissions is reducing the gross 2 Materials Engineering Program, Dalhousie University, weight of vehicles. As the weight is decreased, less fuel Halifax, Nova Scotia, Canada is consumed to propel the vehicle. The average vehicle in 1977 had a mass of 1666 kg, and in 2001 the average Abstract. Magnesium and its alloys are attractive mate- weight had been reduced to 1504 kg; an over 136 kg reduc- rials for use in automotive and aerospace applications be- tion [1]. One of the principal reasons for the weight reduc- cause of their low density and good mechanical properties. tion was the increased use of lightweight materials, espe- However, difficulty in forming magnesium and the limited cially aluminum. In the same 24 year period, the average number of available commercial alloys limit their use. The amount of Al utilized per automobile climbed from 44 kg present work reviews the efforts to improve the attractive- to 116.6 kg. The driving force behind the increased usage ness of magnesium through non-traditional processing, and can be attributed to the intense research effort put forth to presents the results of producing AZ31 magnesium alloy provide over 1600 aluminum alloys from multi-component via powder metallurgy P/M. P/M can be used to alleviate systems and numerous production and fabrication improve- the formability problem through near-net-shape processing, ments. More recently, aluminum products processed via and also allows unique chemical compositions that can lead powder metallurgy (P/M) routes have shown excellent prop- to the development of new alloys with novel properties. erties and are increasing in utilization. The feasibility of producing magnesium powder metal- Magnesium, which has the lowest density of all struc- lurgy products utilizing the industrially dominant process tural metals, has not enjoyed the phenomenal increase in of mixed powder blending, uni-axial die compaction and average mass per vehicle that aluminum has, but had an controlled atmosphere sintering was investigated. An al- exceptional growth of 850 %. Unfortunately, the actual loy composition based on the commercial Mg alloy AZ31 amounts went from under 1 kg in 1977 to 3.86 kg in 2001. (3 mass % Al, 1 mass % Zn) was used to facilitate the com- Aside for low density, magnesium has a number of other parison to similar wrought product. The optimal processing advantageous properties. Its stiffness to weight ratio is very conditions (compaction pressure, sintering time and tem- high; one kilogram of magnesium is as stiff as 3.96 kg of perature) were found to maximize sintered density and me- aluminum and 4.62 kg of steel. The dimensional stability chanical properties. and damping capacity are high, it is easily machined and Results show that sintering temperature is one of the major can be readily recycled [2]. For magnesium to penetrate variables that has an appreciable effect on the final prop- the automotive industry as a structural material several erties of the samples, and that the effects of compaction requirements need to be met [3]. pressure and sintering time were insignificant. The mate- Magnesium has poor corrosion resistance due to heavy rial showed poor tensile properties, with a maximum tensile metal contamination [4] and lacks a catalogue of developed strength of 32 MPa due to lack of sufficient densification. alloys [5]. The use of magnesium in under the hood compo- The latter was related to the lack of liquid phase formed nents is also hindered by the low creep resistance of com- during sintering of Al/Zn magnesium alloys and the barrier mercial alloys [2]. Also, magnesium has a hexagonal close to diffusion due to the presence of the stable magnesium packed (HCP) crystal structure, which leads to difficulty in surface layer. forming, especially at room temperature [5]. Industrially, one of the most commonly utilized magne- sium alloys is AZ31, which contains 3 % aluminum and Keywords. Magnesium powders, magnesium powder metallurgy, AZ31, sintering phenomena. Corresponding author: Georges J. Kipouros, Materials Engineering Program, Dalhousie University, 1360 Barrington Street, Halifax, PACS®(2010). 81.20.EV, 72.15.-V, 82.40.ck, 82.0.-s, Nova Scotia, Canada B3J 2X4; E-mail: [email protected]. 89.20.kk, 61.66.DK, 66.30.Ny. Received: May 23, 2010. Accepted: August 5, 2010. 52 P. Burke and G. J. Kipouros 1 % zinc, by weight. It is used to produce wrought prod- ity not possible with ingot metallurgy. Alloying additions ucts such as sheet and plate, as well as extruded bars and are chosen to improve strength, creep resistance and super- shapes. The relatively low Al content allows greater duc- plasticity [12]. tility at hot working temperatures, and also strengthens the The P/M method utilized to produce the majority of sam- matrix by solid solution. The phase diagram suggests that ples in both the MMC and grain refinement research is precipitation hardening may be possible because Al solu- through canned powder hot extrusion [11,12] primarily due bility reduces from a maximum of 12.7 mass % to 2 mass to safety considerations. In this process, the base powders % at room temperature. However, the precipitates formed, are blended and loaded into a thin-walled cylindrical ves- Mg17Al12 intermetallics, are coarse and not dense enough sel made from a highly formable metal such as aluminum to produce a strong strengthening effect. or copper. The powders are vacuum de-gassed at an ele- Zinc is added to magnesium aluminum alloys in small vated temperature to remove air trapped between particles. amounts to further increase strength by solid solution. Zinc Following de-gassing, the can is sealed. Extrusion takes will form beneficial precipitates through age hardening, but place at sintering temperature and the reduction is typically the co-precipitation of the Mg17Al12 intermetallic negates between 10 W 1 and 20 W 1, allowing the powders to be any increase in strength. AZ31 alloy is generally considered compacted and sintered in one step. This process produces non-heat treatable. parts with very high densities, in the range of 98 %C,but Powder metallurgy can be used to alleviate one the it is mainly a laboratory batch type procedure. To imple- largest problems with magnesium utilization, formability, ment such a process on an industrial scale would be both with its inherent near-net-shape processing. Raw magne- costly and time consuming. It also forfeits near-net-shape sium powders of a 75 m typical size are blended with al- processing, one of P/Ms key advantages. loying elements and compacted in a die at high pressure. The major issue in the development of the magnesium The “green” compacts are then sintered in a controlled at- P/M is the availability of commercial magnesium powders. mosphere at a temperature lower than the melting point, but Unlike aluminum most commercial magnesium powders high enough to allow rapid diffusion between the powder are produced by mechanical grinding. The low cost and particles. The method in which powders are produced al- less restrictive requirements for the main intended use of lows unique chemical compositions that can lead to new magnesium as a reactant make grinding attractive. For P/M alloys with novel properties [6, 7]. applications the angular morphology of the powder gives Limited research has been done on the use of powder good green strength because of mechanical interlocking, but metallurgy routes for the production of magnesium prod- the powder particles are typically covered by a thick surface ucts. The research that has involved magnesium pow- layer. The layer is hypothesized to contain primarily oxides, der mainly uses P/M as a means to produce difficult but hydroxides and carbonates are possible due to long sub- to form alloys. These include metal matrix composites jection to atmospheric conditions during the grinding pro- (MMC) [8–10], where P/M can alleviate some of the ma- cess. Recently magnesium powder is also being produced trix/reinforcement interface issues when the matrix metal is commercially by centrifugal atomization by a small number in the molten state. The P/M method also allows a highly of companies. The product has very little surface oxidation homogenous mixture of the reinforcement particles within due to the inert conditions maintained during production, the matrix, resulting in consistent mechanical properties but the spherical morphology gives poor green strength. Be- in all directions. Difficulty to achieve successful sintering cause the amount of surface absorbed oxygen is not readily has brought into question the possibility of P/M to produce available the applicability of powder metallurgy to magne- magnesium matrix composites [9]. The state in which the sium metal is in question [9]. No fundamental studies of the surface of the magnesium powder before the P/M process- sintering behaviour of magnesium powders have been com- ing is the controlling factor in the sintering process. Obvi- pleted to date, but preliminary studies have been reported ously the methods of production of magnesium powder are [13,14]. The goal of the study is to determine if the surface critical in achieving the properties required for a successful layer is in fact the main obstacle to producing magnesium sintering. It appears that no attention has been paid into the P/M parts without the addition of secondary hot working, characterization of the surface properties of the magnesium by looking solely at solid state sintering of pure magnesium powders.
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