In-situ neutron diffraction of a quasicrystal-containing Mg alloy interpreted using a new polycrystal plasticity model of hardening due to {10.2} tensile twinning

被引:56
作者
Agnew, S. R. [1 ]
Singh, A. [2 ]
Calhoun, C. A. [1 ,6 ]
Mulay, R. P. [1 ,7 ]
Bhattacharyya, J. J. [1 ]
Somekawa, H. [2 ]
Mukai, T. [3 ]
Clausen, B. [4 ]
Wu, P. D. [5 ]
机构
[1] Univ Virginia, Mat Sci & Engn, Charlottesville, VA 22904 USA
[2] Natl Inst Mat Sci, Tsukuba, Ibaraki, Japan
[3] Kobe Univ, Mech Engn, Kobe, Hyogo, Japan
[4] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM USA
[5] McMaster Univ, Mech Engn, Hamilton, ON, Canada
[6] NIST, Gaithersburg, MD 20899 USA
[7] LLNL, Livermore, CA 94550 USA
基金
加拿大自然科学与工程研究理事会; 美国国家科学基金会;
关键词
Precipitation; Quasicrystal; Icosahedral; Twinning; Neutron diffraction; Internal stress; MAGNESIUM SINGLE-CRYSTALS; ZN-Y ALLOYS; TRANSMISSION ELECTRON-MICROSCOPY; STACKING-FAULT-ENERGY; FINITE-ELEMENT MODEL; DEFORMATION MECHANISMS; FRACTURE-TOUGHNESS; DISLOCATION CLIMB; GRAIN-REFINEMENT; PRISMATIC SLIP;
D O I
10.1016/j.ijplas.2017.09.005
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Due to the excellent balance of strength and ductility exhibited by some Mg-Zn-RE (Y subgroup rare earth element) alloys, which contain icosahedral quasicrystalline precipitates, it is of interest to examine their deformation mechanisms. The internal strain evolution Mg-3at%Zn-0.5 at%Y with 4 vol% i-phase was measured using in-situ neutron diffraction. The extruded samples exhibit an initially weak <10.0> parallel to extrusion direction "rod texture," distinct from the normally strong texture of extruded Mg alloys, but the grain size is unexceptional (16.7 +/- 2.1 mu m). The initially weak texture contributes to a nearly symmetric yielding response between tension and compression. The hardening responses are asymmetric, however, since {10.2} extension twinning is significantly more active during compressive straining, despite the initially weak texture. In-situ neutron diffraction tension and compression experiments parallel to the extrusion direction, together with elasto-plastic self-consistent (EPSC) crystal plasticity modeling, reveal the strength and hardening behavior of individual slip and twinning modes. The previously published twinning-detwinning (TDT) model is implemented within the EPSC framework, and it is proven effective for describing the observed, mild tension-compression asymmetry. This is not possible with previous EPSC-based models of twinning. Finally, the description of hardening within the TDT model is modified, in order to accurately describe the evolution of internal strains within the twins. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码:34 / 51
页数:18
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