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

Agnew, S. R.; Singh, A.; Calhoun, C. A.; Mulay, R. P.; Bhattacharyya, J. J.; Somekawa, H.; Mukai, T.; Clausen, B.; Wu, P. D.

doi:10.1016/j.ijplas.2017.09.005

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

Journal Article · Mon Sep 17 00:00:00 EDT 2018 · International Journal of Plasticity

DOI:https://doi.org/10.1016/j.ijplas.2017.09.005· OSTI ID:1407881

Agnew, S. R. ^[1]; ^[2]; Calhoun, C. A. ^[1]; Mulay, R. P. ^[1]; Bhattacharyya, J. J. ^[1]; Somekawa, H. ^[2]; Mukai, T. ^[3]; ^[4]; Wu, P. D. ^[5]

Univ. of Virginia, Charlottesville, VA (United States). Materials Science and Engineering
National Inst. of Materials Science, Tsukuba (Japan)
Kobe Univ. (Japan). Mechanical Engineering
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
McMaster Univ., Hamilton, ON (Canada). Mechanical Engineering

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. Furthermore, 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> || extrusion direction “rod texture,” distinct from the normally strong texture of extruded Mg alloys, but the grain size is unexceptional (16.7 ± 2.1 μm). 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. A model that was previously published about twinning-detwinning (TDT) 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.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1407881

Alternate ID(s):: OSTI ID: 1550012

Report Number(s):: LA-UR-17-21567

Journal Information:: International Journal of Plasticity, Journal Name: International Journal of Plasticity Journal Issue: C Vol. 100; ISSN 0749-6419

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Journal Article · Sun Jan 31 19:00:00 EST 2021 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing · OSTI ID:1785086

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36 MATERIALS SCIENCE
icosahedral
internal stress
neutron diffraction
precipitation
quasicrystal
twinning

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

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