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Title: Effect of local stress fields on twin characteristics in HCP metals

Abstract

Here we study the effect of nearest neighboring grains on the propensity for {1012} twin growth in Mg and Zr. Twin lamellae lying within one grain flanked by two neighboring grains with several orientations are considered. The fields of resolved shear stress on the twin system are calculated in the multicrystal using a three-dimensional full-field crystal plasticity Fast Fourier Transform approach. The calculations were carried out for Mg and Zr using slip threshold stresses corresponding to 300K and 76K, respectively, where twin activity is important. We show that the neighboring grain constraint tends to oppose further growth and that the critical applied stress needed to overcome this resistance depends on neighboring grain orientation, more strongly in Zr than in Mg. We also present results for a pair of adjacent and parallel twins at various spacings. It is found that their paired interaction increases the resistive forces for twin growth above that for an isolated twin. The critical spacing above which this enhanced resistance is removed is smaller for Zr than Mg. Our analysis reveals that these two disparate responses of Zr and Mg are both a consequence of the fact that Zr is elastically and plastically more anisotropic than Mg.more » Additional calculations carried out on Ti support this conclusion. Finally, these findings can help explain why, for the same grain size, more twins per grain form in Zr than in Mg, twins in Zr tend to be thinner than those in Mg, and the relationship between the thickness of the twin and its Schmid factor in Zr is not as strong as in Mg.« less

Authors:
 [1];  [2];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Division
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Materials Science and Technology Divisio
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); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1304731
Alternate Identifier(s):
OSTI ID: 1351012
Report Number(s):
LA-UR-16-24148
Journal ID: ISSN 1359-6454
Grant/Contract Number:  
AC52-06NA25396; FWP-06SCPE401
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 116; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Arul Kumar, M., Beyerlein, Irene Jane, and Tomé, Carlos N. Effect of local stress fields on twin characteristics in HCP metals. United States: N. p., 2016. Web. https://doi.org/10.1016/j.actamat.2016.06.042.
Arul Kumar, M., Beyerlein, Irene Jane, & Tomé, Carlos N. Effect of local stress fields on twin characteristics in HCP metals. United States. https://doi.org/10.1016/j.actamat.2016.06.042
Arul Kumar, M., Beyerlein, Irene Jane, and Tomé, Carlos N. Thu . "Effect of local stress fields on twin characteristics in HCP metals". United States. https://doi.org/10.1016/j.actamat.2016.06.042. https://www.osti.gov/servlets/purl/1304731.
@article{osti_1304731,
title = {Effect of local stress fields on twin characteristics in HCP metals},
author = {Arul Kumar, M. and Beyerlein, Irene Jane and Tomé, Carlos N.},
abstractNote = {Here we study the effect of nearest neighboring grains on the propensity for {1012} twin growth in Mg and Zr. Twin lamellae lying within one grain flanked by two neighboring grains with several orientations are considered. The fields of resolved shear stress on the twin system are calculated in the multicrystal using a three-dimensional full-field crystal plasticity Fast Fourier Transform approach. The calculations were carried out for Mg and Zr using slip threshold stresses corresponding to 300K and 76K, respectively, where twin activity is important. We show that the neighboring grain constraint tends to oppose further growth and that the critical applied stress needed to overcome this resistance depends on neighboring grain orientation, more strongly in Zr than in Mg. We also present results for a pair of adjacent and parallel twins at various spacings. It is found that their paired interaction increases the resistive forces for twin growth above that for an isolated twin. The critical spacing above which this enhanced resistance is removed is smaller for Zr than Mg. Our analysis reveals that these two disparate responses of Zr and Mg are both a consequence of the fact that Zr is elastically and plastically more anisotropic than Mg. Additional calculations carried out on Ti support this conclusion. Finally, these findings can help explain why, for the same grain size, more twins per grain form in Zr than in Mg, twins in Zr tend to be thinner than those in Mg, and the relationship between the thickness of the twin and its Schmid factor in Zr is not as strong as in Mg.},
doi = {10.1016/j.actamat.2016.06.042},
journal = {Acta Materialia},
number = C,
volume = 116,
place = {United States},
year = {2016},
month = {9}
}

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Cited by: 14 works
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Works referencing / citing this record:

Twin hopping in nanolayered Zr-2.5Nb
journal, April 2020


Strong grain neighbour effects in polycrystals
journal, January 2018

  • Abdolvand, Hamidreza; Wright, Jonathan; Wilkinson, Angus J.
  • Nature Communications, Vol. 9, Issue 1
  • DOI: 10.1038/s41467-017-02213-9

Three-dimensional character of the deformation twin in magnesium
journal, July 2019


On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys
journal, September 2019


Quantitative analysis of {332}〈113〉 twinning in a Ti-15Mo alloy by in situ scanning electron microscopy
journal, June 2018

  • Gutierrez-Urrutia, Ivan; Li, Cheng-Lin; Ji, Xin
  • Science and Technology of Advanced Materials, Vol. 19, Issue 1
  • DOI: 10.1080/14686996.2018.1475824

Twin hopping in nanolayered Zr-2.5Nb
text, January 2020