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The mechanism for the different effects of texture on yield strength and hardness of Mg alloys

A study regarding the effect of texture on tensile yield strength and hardness of an extruded Mg-15Gd-0.5Zr rod was performed, with a great emphasis laid on the relevant mechanisms. A 7% pre-tension along the extrusion direction (ED) in the solid solution condition was used to transform the texture...

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Autores principales: Guo, Feilong, Yu, Huihui, Wu, Chenyu, Xin, Yunchang, He, Cong, Liu, Qing
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5561024/
https://www.ncbi.nlm.nih.gov/pubmed/28819311
http://dx.doi.org/10.1038/s41598-017-08966-z
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author Guo, Feilong
Yu, Huihui
Wu, Chenyu
Xin, Yunchang
He, Cong
Liu, Qing
author_facet Guo, Feilong
Yu, Huihui
Wu, Chenyu
Xin, Yunchang
He, Cong
Liu, Qing
author_sort Guo, Feilong
collection PubMed
description A study regarding the effect of texture on tensile yield strength and hardness of an extruded Mg-15Gd-0.5Zr rod was performed, with a great emphasis laid on the relevant mechanisms. A 7% pre-tension along the extrusion direction (ED) in the solid solution condition was used to transform the texture from a broad distribution of basal poles with a peak approximately 45° with respect to the ED into a texture with basal poles largely perpendicular to the ED. This texture variation enhances the yield strength of peak aged sample by approximately 103 MPa, while hardly increases the peak hardness. The analysis about the ratio of the critical resolved shear stress (CRSS) to Schmid factor shows that this texture variation results in a larger fraction of grains favoring prismatic slip with a higher activation stress under tension along the ED. In contrast, the complex stress state during hardness test initiates multiple deformation modes, which renders the value of hardness insensitive to the texture variation. This different dependence of deformation modes on texture mainly accounts for the different increments in hardness and tensile yield strength.
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spelling pubmed-55610242017-08-18 The mechanism for the different effects of texture on yield strength and hardness of Mg alloys Guo, Feilong Yu, Huihui Wu, Chenyu Xin, Yunchang He, Cong Liu, Qing Sci Rep Article A study regarding the effect of texture on tensile yield strength and hardness of an extruded Mg-15Gd-0.5Zr rod was performed, with a great emphasis laid on the relevant mechanisms. A 7% pre-tension along the extrusion direction (ED) in the solid solution condition was used to transform the texture from a broad distribution of basal poles with a peak approximately 45° with respect to the ED into a texture with basal poles largely perpendicular to the ED. This texture variation enhances the yield strength of peak aged sample by approximately 103 MPa, while hardly increases the peak hardness. The analysis about the ratio of the critical resolved shear stress (CRSS) to Schmid factor shows that this texture variation results in a larger fraction of grains favoring prismatic slip with a higher activation stress under tension along the ED. In contrast, the complex stress state during hardness test initiates multiple deformation modes, which renders the value of hardness insensitive to the texture variation. This different dependence of deformation modes on texture mainly accounts for the different increments in hardness and tensile yield strength. Nature Publishing Group UK 2017-08-17 /pmc/articles/PMC5561024/ /pubmed/28819311 http://dx.doi.org/10.1038/s41598-017-08966-z Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Guo, Feilong
Yu, Huihui
Wu, Chenyu
Xin, Yunchang
He, Cong
Liu, Qing
The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title_full The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title_fullStr The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title_full_unstemmed The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title_short The mechanism for the different effects of texture on yield strength and hardness of Mg alloys
title_sort mechanism for the different effects of texture on yield strength and hardness of mg alloys
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5561024/
https://www.ncbi.nlm.nih.gov/pubmed/28819311
http://dx.doi.org/10.1038/s41598-017-08966-z
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