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Title: A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg

Abstract

Mg is inherently plastically anisotropic and, over the years, alloying development efforts have sought to reduce the plastic anisotropy in order to enhance formability. To understand the relationship between alloy type and plastic anisotropy, we use a visco-plastic self-consistent (VPSC) polycrystal plasticity model to relate the macroscopic constitutive response to the underlying slip and twinning mechanisms in pure Mg and several Mg alloys. In the calculations, the influence of alloy type is represented by the differences in the CRSS values among the basal, prismatic, pyramidal slip and tensile twin systems. We show that for the same initial texture, this microscopic-level CRSS anisotropy can have a significant effect on the macroscopic indicators of formability, namely the anisotropy of the post-deformation polycrystal yield surface, tension-compression yield asymmetry, and Lankford coefficients. A plastic anisotropy (PA) measure is formulated to quantify the degree of single crystal plastic anisotropy acquired by the dissimilarities in the CRSS values of the slip and twinning modes for a given alloy. We demonstrate a strong correlation between the PA measure with the formability indicators mentioned above for multiple initial textures commonly enountered in processing. In conclusion, we find that alloys can be classified into two groups, those with amore » PA value below 2, which are more formable, less twinnable, and less sensitive to initial texture, where PA ~2 for pure Mg, and those with a PA value above 2, which possess the opposite deformation response.« less

Authors:
 [1];  [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC). Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1331290
Report Number(s):
LA-UR-16-26904
Journal ID: ISSN 0925-8388
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Name: Journal of Alloys and Compounds; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; anisotropy; magnesium; yield surface; Lankford coefficients; texture

Citation Formats

Arul Kumar, Mariyappan, Beyerlein, Irene Jane, and Tome, Carlos N. A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg. United States: N. p., 2016. Web. https://doi.org/10.1016/j.jallcom.2016.10.287.
Arul Kumar, Mariyappan, Beyerlein, Irene Jane, & Tome, Carlos N. A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg. United States. https://doi.org/10.1016/j.jallcom.2016.10.287
Arul Kumar, Mariyappan, Beyerlein, Irene Jane, and Tome, Carlos N. Tue . "A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg". United States. https://doi.org/10.1016/j.jallcom.2016.10.287. https://www.osti.gov/servlets/purl/1331290.
@article{osti_1331290,
title = {A measure of plastic anisotropy for hexagonal close packed metals: Application to alloying effects on the formability of Mg},
author = {Arul Kumar, Mariyappan and Beyerlein, Irene Jane and Tome, Carlos N.},
abstractNote = {Mg is inherently plastically anisotropic and, over the years, alloying development efforts have sought to reduce the plastic anisotropy in order to enhance formability. To understand the relationship between alloy type and plastic anisotropy, we use a visco-plastic self-consistent (VPSC) polycrystal plasticity model to relate the macroscopic constitutive response to the underlying slip and twinning mechanisms in pure Mg and several Mg alloys. In the calculations, the influence of alloy type is represented by the differences in the CRSS values among the basal, prismatic, pyramidal slip and tensile twin systems. We show that for the same initial texture, this microscopic-level CRSS anisotropy can have a significant effect on the macroscopic indicators of formability, namely the anisotropy of the post-deformation polycrystal yield surface, tension-compression yield asymmetry, and Lankford coefficients. A plastic anisotropy (PA) measure is formulated to quantify the degree of single crystal plastic anisotropy acquired by the dissimilarities in the CRSS values of the slip and twinning modes for a given alloy. We demonstrate a strong correlation between the PA measure with the formability indicators mentioned above for multiple initial textures commonly enountered in processing. In conclusion, we find that alloys can be classified into two groups, those with a PA value below 2, which are more formable, less twinnable, and less sensitive to initial texture, where PA ~2 for pure Mg, and those with a PA value above 2, which possess the opposite deformation response.},
doi = {10.1016/j.jallcom.2016.10.287},
journal = {Journal of Alloys and Compounds},
number = ,
volume = ,
place = {United States},
year = {2016},
month = {11}
}

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