Beyond Orowan hardening: Mapping the four distinct mechanisms associated with dislocation-precipitate interaction

doi:10.1016/j.ijplas.2023.103710

IMECH-IR > 非线性力学国家重点实验室

	Beyond Orowan hardening: Mapping the four distinct mechanisms associated with dislocation-precipitate interaction
	Peng, Shenyou; Wang, Zhili ; Li, Jia ; Fang, Qihong ; Wei YJ(魏宇杰)
发表期刊	INTERNATIONAL JOURNAL OF PLASTICITY
	2023-10-01
卷号	169 页码:103710
ISSN	0749-6419
摘要	The conventional role played by precipitates in crystalline solids is in blocking the motion of dislocations and for consequentially hardening, a mechanism attributed to Orowan's finding. Recent experiments and theoretical analysis demonstrated that a few nanometre-sized pre-cipitates, when dispersed in advanced metals at fine spacing, can further boost their strength at no sacrifice in ductility. In this paper, we construct the deformation map of four distinct mechanisms associated with dislocation-precipitate interaction: at low-to-intermediate stress level, disloca-tions may loop around a precipitate or cut-through it. In both scenarios the precipitates harden the materials and there is no net gaining of dislocations. At high stress level, nanoscale pre-cipitates may in contrast act as dislocation sources and generate dislocations from the matrix-precipitate interface - an interface-nucleation process; or emit dislocations when highly stressed dislocations transverse them - a radiation-emission process. While the interface-nucleation mechanism could supply sustainable dislocation multiplication, the radiation-emission leads to the multiplication of two additional dislocations. Based on large-scale simula-tions and theoretical analysis, we construct a deformation map on dislocation-precipitate inter-action in terms of stress and precipitate size. The revealed mechanisms and the dislocation-precipitate interaction map pave the way for strength-ductility optimization in materials through precipitation engineering.
关键词	Dislocation Precipitate Orowan hardening Radiation-emission Interface-nucleation
DOI	10.1016/j.ijplas.2023.103710
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:001050863200001
WOS研究方向	Engineering ; Materials Science ; Mechanics
WOS类目	Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics
项目资助者	National Natural Science Foundation of China [12102133, 12172123, 12072109, 11988102]
论文分区	一类
力学所作者排名	1
RpAuthor	Fang, QH (corresponding author), Hunan Univ, Coll Mech & Vehicle Engn, Changsha 410082, Peoples R China. ; Wei, YJ (corresponding author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
引用统计	被引频次：4[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/92655
专题	非线性力学国家重点实验室
作者单位	1.{Peng Shenyou, Wang Zhili, Li Jia, Fang Qihong} Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China 2.{Wei Yujie} Chinese Acad Sci Inst Mech LNM Beijing 100190 Peoples R China 3.{Wei Yujie} Eastern Inst Adv Study EIAS Ningbo 315200 Peoples R China
推荐引用方式 GB/T 7714	Peng, Shenyou,Wang, Zhili,Li, Jia,et al. Beyond Orowan hardening: Mapping the four distinct mechanisms associated with dislocation-precipitate interaction[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2023,169:103710.
APA	Peng, Shenyou,Wang, Zhili,Li, Jia,Fang, Qihong,&魏宇杰.(2023).Beyond Orowan hardening: Mapping the four distinct mechanisms associated with dislocation-precipitate interaction.INTERNATIONAL JOURNAL OF PLASTICITY,169,103710.
MLA	Peng, Shenyou,et al."Beyond Orowan hardening: Mapping the four distinct mechanisms associated with dislocation-precipitate interaction".INTERNATIONAL JOURNAL OF PLASTICITY 169(2023):103710.

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