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Symposium BB: 2005 MRS Spring Meeting (PDF) SYMPOSIUM BB Mechanical Properties of Nanostructured Materials-Experiments and Modeling March 29 - April 1, 2005 Chairs .T. G. Swadener Erica Lilleoden Los Alamos National Laboratory Lawrence Berkeley Laboratory MST-8, MS G755 MS 66-200 Los Alamos, NM 87545 1 Cyclotron Rd. 505-667-9952 Berkeley, CA 94720 510-486-4836 Syed Asif David Bahr Hysitron, Inc. School of Mechanical & Materials Engr 1025 Valley View Rd. Washington State University Minneapolis, MN 55344 Pullman, WA 99164-2920 952-835-6366 509-335-8523 Daniel Weygand Institut fur Zuverlssigkeit von Bauteilen und Systemen Universitat Karlsruhe Kaiserstr. 12 Karlsruhe, 76131 Germany 49-721-608-8508 Symposium Support tHysitron, Inc. P005 Spring Exhibitor Proceedings to be published online (see ONLINE PUBLICATIONS at www.mrs.org) as volume 880E of the Materials Research Society Symposium Proceedings Series. This 1Jolum,p may bp published in print format after thp meeting. * Invited paper 599 SESSION BB1: Microscopic Characterization and electrodeposition. The grain sizes range fron1 40nn1 to 800nn1 in Processing dian1eter. Results n1echanical properties were investigated by tensile Chairs: Bennett Larson and Helena van Swygenhoven test perforn1ed within a high resolution scanning electron n1icroscope Tuesday Morning, March 29, 2005 and by nanoidentation. The characterization of the grain shape Room 201 () (Moscone West) through the cross-section, population of growth twins, grain boundary character, local texture and local relationship between microstructure and grain orientation were done by use of Electron backscattered 8:30 AM *BB1.1 diffraction (EBSD). 3D X-Ray Structural Microscopy Study of Nanoindentation Induced Deformation in Copper. Bennett Larson, Condensed 9:30 AM BB1.4 Matter Sciences, Oak Ridge National Lab., Oak Ridge, Tennessee. Process and Properties of Bulk Nanostructured Materials. l 1 l 2 Ricardo B. Schwarz , Tong D. Shen , Xing H. Zhang and Ke Han ; Nanoindentation in ductile 111aterials induces plastic deforn1ation within confined volumes under well-defined boundary conditions and 'MST-8, Los Alamos National Laboratory, Los Alamos, New Mexico: strong strain gradients. Three-din1ensional x-ray structural 2National High Mag. Field Lab., Tallahassee, Florida. 111icroscopy with subn1icron point-to-point spatial resolution has been used to 111ake non-destructive 111easuren1ents of the local defor111ation During the past two decades, there has been increasing interest into 111icrostructure under nano/111icroindents in single crystal Cu. nano-crystalline n1aterials, aiIning at exploring their potential for Measuren1ents of local lattice orientations under spherical indents in applications. Most of the studies, however, have been in Cu (~0.02 degree angular resolution) show a complex distribution of zero-dilnensional (nanoparticles), one-dilnensional (nanowires) and collective lattice rotations with sharply defined features penetrating two-din1ensional (thin-filn1 n1ultilayers) nanon1aterials. There have deeply into the crystal. These local rotation n1easuren1ents have been been few studies on three-diInensional bulk nanon1aterials because used to construct 3D spatially resolved maps of the local lattice good-quality BULK nanocrystalline alloys are difficult to prepare. We curvature in terms of local Nye dislocation tensors. Spatially resolved have prepared bulk nanocrystalline Ag-Cu alloys that are free of plots of the three orthogonal rotations and each of the nine artifacts (porosity, inclusions, cracks, etc). The breakthrough came components of the dislocation tensor will be presented for selected through the use of a flux-lnelting technique, which enabled us purify slices through the deforn1ed volun1es. Such n1easuren1ents provide a the n10lten alloy, ren10ving Inost heteronucleants. A purified eutectic direct and absolute connection between experin1ental n1easuren1ents of Ag-Cu melt was thus undercooled by approximately 250 K. At this deforn1ation in n1aterials and the results of con1puter sin1ulations and large undercooling, the rate of crystal nucleation don1inates over the n1ulti-scale n10deling. The outlook for extending x-ray structural rate of crystal growth, resulting in a nanocrystalline n1icrostructure. n1icroscopy n1easuren1ents to shorter length scales and polycrystalline These alloys are composed of Ag and Cu lamellae, with an average n1aterials will be discussed. *Research sponsored by the Departn1ent lan1ellar spacing of 50 nn1 and an average crystallite size of 40 nn1. We of Energy, Office of Science, Division of Materials Sciences at ORNL have studied the n1icrostructure, physical, and n1echanical properties managed by UT-Battelle, LLC, under contract DE-AC05-000R2272. of bulk Ag-Cu nanocrystalline alloys. The alloys have high strength The work was performed on the UNI-CAT beamline at the APS: the (in the 500 to 1,000 MPa range), reasonable tensile ductility (10% operation of the APS is sponsored by the DOE. elongation at 500 MPa), very soft elastic moduli (10% of polycrystalline alloys), high conductivity (80% of fully annealed pure 9:00 AM BB1.2 Cu), and relatively high thermal stability. Furthermore, the yield Influence of Temperature on in-situ X-ray Peak Profile strength n1easured in tension and in con1pression are approxin1ately Behaviour in Nanocrystalline Ni. Stefan Brandstetter', Zeljka the san1e, indicating the asyn1n1etry between these quantities 1 1 2 previously reported for nanocrystalline n1aterials was n10st likely due Budrovic Steven Van Petegen1 , Bernd Schn1itt , Antonio 1 Cervellino and Helena Van Swygenhoven1; 1 ASQ/NUM, Paul to n1anufacture artifacts. The strength of our nanocrystalline Ag-Cu rods has been further increased by drawing. These alloys have Scherrer Institution, Villigen PSI, Switzerland; 2SYN, Paul Scherrer potential for the n1anufacture of coils for high-energy pulsed n1agnets. Institute, Villigen PSI, Switzerland. 9:45 AM BB1.5 Electrodeposited nc-Ni and ultra-fine grained HPT-Ni are deformed Mechanical Behavior of a Nanostrllctllren Al Matrix in-situ under tension at the Inaterials bealnline of the Swiss Light Composite. Jichun Ye, Bing Q. Han, Feng Tang and Julie M. Source allowing n1easuren1ent of peak position and peak width as a Schoenung; Chenlical Engineering and Materials Science, University of function of applied stress and strain, fron1 which inforn1ation on California, Davis, Davis, California. elastic and plastic properties can be obtained. Continuous l loading/unloading and stress relaxation experin1ents are carried out at Mechanical n1illing at cryogenic ten1peratures (cryon1illing) was 300K and now also at 200K where diffusional properties are expected applied to fabricate a composite powder with 20 wt. % submicron to be suppressed. The Youngs n10dulus is calculated fron1 the peak B4C particulates in a nanocrystalline (NC) 5083 Al matrix. A mixture positions as a function of stress during elastic loading, revealing of 50 wt.% cryomilled composite powder and 50 wt. % unmilled different elastic properties between ED-Ni and HPT-Ni. Peak profile coarse-grained (CG) 5083 Al powder was degassed, followed by cold analysis denlonstrates that plastic deforn1ation in HPT-Ni is governed isostatic pressing (CIP) and extrusion to forn1 a nanocon1posite with by dislocation Inediated processes that accunnl1ate a residual 10 wt.% B4C, 50 wt. % CG 5083 Al and balance NC 5083 A!. The dislocation network producing inhon10geneous strains and an n1echanical properties under con1pressive and tensile loading irreversible broadening of the Bragg peaks in X-ray diffraction. On conditions at various ten1peratures were exan1ined. At an1bient the contrary, the peak broadening during plastic defoflnation of temperature, the composite possessed a yield stress of 1150 MPa and nanocrystalline Ni is entirely reversible upon unloading, elongation-to-failure of 2.5 % under the con1pressive load, while under demonstrating that the deformation process does not build up a tensile load it fractured in elastic deforn1ation region. A residual dislocation network (Science 304 (2004) 273). Lowering the tension-con1pression syn1n1etry was observed at all elevated deforn1ation ten1perature for ED-Ni reduces the an10unt of peak temperatures. The composite exhibited a high yield strength of 940 broadening however keeping the reversibility upon unloading. Stress MPa and 340 MPa at temperatures of 373 K (0.43 Tm) and 473 K relaxation at rOO1n ten1perature is characterized by a serious drops in (0.55 Tm), respectively. Even at a high temperature of 673 K (0.78 peak broadening over the tin1e span of a few hours, whereas at low Tm), the composite still possessed a yield strength of 100 MPa. A ten1peratures, hardly any reduction in peak width is observed. The highest tensile ductility of 26% was observed at 473 K. Homogeneous effect of ten1perature on the defoflnation n1echanisn1 is discussed in con1pressive deforn1ation was observed at all the elevated ten1peratures tern1S of dislocation and grain boundary accon1n10dation n1echanisn1s (373 K). The hybrid microstructure of this composite, including the suggested by at01nistic con1puter silnulations. distribution of each phase, the grain sizes of the Al n1atrix, the interfaces between these three phases, and the fracture surfaces were 9:15 AM BB1.3 characterized using transn1ission electron n1icroscopy (TEM) and Characterization of the Microstructure of Nanostructure scanning electron microscopy (SEM) techniques. The relationship Electrodeposited Materials by use of Electron Backscattered
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