Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy

Nanocrystalline materials exhibit many unique physical and chemical properties with respect to their coarse-grained counterparts due to the high volume fraction of grain boundaries. Research interests on nanocrystalline materials around the world have been lasting over the past decades. In this stud...

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Autores principales:	Shilun Yu, Yingchun Wan, Chuming Liu, Zhiyong Chen, Xiangyang Zhou
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Mg alloy nanocrystalline nanoindentation strain rate sensitivity creep Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
Acceso en línea:	https://doaj.org/article/098e47d0ba8848c1a568b892d38e5d19
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spelling	oai:doaj.org-article:098e47d0ba8848c1a568b892d38e5d192021-11-25T18:16:23ZTwinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy10.3390/ma142271041996-1944https://doaj.org/article/098e47d0ba8848c1a568b892d38e5d192021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1944/14/22/7104https://doaj.org/toc/1996-1944Nanocrystalline materials exhibit many unique physical and chemical properties with respect to their coarse-grained counterparts due to the high volume fraction of grain boundaries. Research interests on nanocrystalline materials around the world have been lasting over the past decades. In this study, we explored the room temperature strain rate sensitivity and creep behavior of the nanocrystalline Mg–Gd–Y–Zr alloy by using a nanoindentation technique. Results showed that the hardness and creep displacements of the nanocrystalline Mg–Gd–Y–Zr alloy decreased with increasing loading strain rate. That is, the nanocrystalline Mg–Gd–Y–Zr alloy showed negative strain rate sensitivity and its creep behavior also exhibited negative rate dependence. It was revealed that the enhanced twinning activities at higher loading strain rates resulted in reduced hardness and creep displacements. The dominant creep mechanism of the nanocrystalline Mg–Gd–Y–Zr alloy is discussed based on a work-of-indentation theory in this paper.Shilun YuYingchun WanChuming LiuZhiyong ChenXiangyang ZhouMDPI AGarticleMg alloynanocrystallinenanoindentationstrain rate sensitivitycreepTechnologyTElectrical engineering. Electronics. Nuclear engineeringTK1-9971Engineering (General). Civil engineering (General)TA1-2040MicroscopyQH201-278.5Descriptive and experimental mechanicsQC120-168.85ENMaterials, Vol 14, Iss 7104, p 7104 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mg alloy nanocrystalline nanoindentation strain rate sensitivity creep Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85
spellingShingle	Mg alloy nanocrystalline nanoindentation strain rate sensitivity creep Technology T Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 Shilun Yu Yingchun Wan Chuming Liu Zhiyong Chen Xiangyang Zhou Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
description	Nanocrystalline materials exhibit many unique physical and chemical properties with respect to their coarse-grained counterparts due to the high volume fraction of grain boundaries. Research interests on nanocrystalline materials around the world have been lasting over the past decades. In this study, we explored the room temperature strain rate sensitivity and creep behavior of the nanocrystalline Mg–Gd–Y–Zr alloy by using a nanoindentation technique. Results showed that the hardness and creep displacements of the nanocrystalline Mg–Gd–Y–Zr alloy decreased with increasing loading strain rate. That is, the nanocrystalline Mg–Gd–Y–Zr alloy showed negative strain rate sensitivity and its creep behavior also exhibited negative rate dependence. It was revealed that the enhanced twinning activities at higher loading strain rates resulted in reduced hardness and creep displacements. The dominant creep mechanism of the nanocrystalline Mg–Gd–Y–Zr alloy is discussed based on a work-of-indentation theory in this paper.
format	article
author	Shilun Yu Yingchun Wan Chuming Liu Zhiyong Chen Xiangyang Zhou
author_facet	Shilun Yu Yingchun Wan Chuming Liu Zhiyong Chen Xiangyang Zhou
author_sort	Shilun Yu
title	Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
title_short	Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
title_full	Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
title_fullStr	Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
title_full_unstemmed	Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy
title_sort	twinning-induced abnormal strain rate sensitivity and indentation creep behavior in nanocrystalline mg alloy
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/098e47d0ba8848c1a568b892d38e5d19
work_keys_str_mv	AT shilunyu twinninginducedabnormalstrainratesensitivityandindentationcreepbehaviorinnanocrystallinemgalloy AT yingchunwan twinninginducedabnormalstrainratesensitivityandindentationcreepbehaviorinnanocrystallinemgalloy AT chumingliu twinninginducedabnormalstrainratesensitivityandindentationcreepbehaviorinnanocrystallinemgalloy AT zhiyongchen twinninginducedabnormalstrainratesensitivityandindentationcreepbehaviorinnanocrystallinemgalloy AT xiangyangzhou twinninginducedabnormalstrainratesensitivityandindentationcreepbehaviorinnanocrystallinemgalloy
_version_	1718411361488207872

Twinning-Induced Abnormal Strain Rate Sensitivity and Indentation Creep Behavior in Nanocrystalline Mg Alloy

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