Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys

doi:10.3389/fmats.2021.767795

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys
	Cheng WQ(程文强)1,2; Yuan FP(袁福平)1,2; Wu XL(武晓雷)1,2
刊名	FRONTIERS IN MATERIALS
	2021-11-12
卷号	8 页码:12
关键词	high-entropy alloys lattice distortion local chemical ordering precipitation strengthening mechanisms molecular dynamics simulations
ISSN号	2296-8016
DOI	10.3389/fmats.2021.767795
通讯作者	Yuan, Fuping(fpyuan@lnm.imech.ac.cn)
英文摘要	Extraordinary mechanical properties can be achieved in high-entropy alloys (HEAs) or medium-entropy alloys (MEAs) with nanoprecipitates. In the present study, the extra coupled strengthening effects by lattice distortion, local chemical ordering, and nanoprecipitates in the HEAs and MEAs with nanoprecipitates have been systematically investigated by large-scale molecular dynamics simulations. The moving of the dislocation can be slowed down, and the dislocation line shows a wavy configuration due to lattice distortion and local chemical ordering, resulting in strengthening. The degree of the wavy configuration increases and the sliding velocity of the dislocation decreases with increasing degrees of local chemical ordering. It is clearly indicated that the dislocation moves via nanoscale segment detrapping mechanism due to the effects of lattice distortion and local chemical ordering, resulting in roughened dislocation pathways for strengthening. The activated nanoscale segments are observed to be easier to detrap from the regions with stronger Co-Cr local chemical ordering and then propagate into the regions without such chemical ordering. These moving characteristics of the dislocation can delay the unpinning process from nanoprecipitates; thus, extra coupled strengthening effect has been revealed in the HEAs and MEAs with nanoprecipitates compared to pure Orowan's strengthening.
分类号	二类
资助项目	National Key R and D Program of China[2017YFA0204402] ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics[11988102] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] ; Development Project of China Railway[N2020J028]
WOS关键词	SHORT-RANGE ORDER ; ATOMISTIC SIMULATIONS ; CRCONI ; DEFORMATION ; DUCTILITY ; IMPACT ; NANOPARTICLES ; BEHAVIOR ; STEEL
WOS研究方向	Materials Science
语种	英语
WOS记录号	WOS:000726070300001
资助机构	National Key R and D Program of China ; NSFC Basic Science Center Program for Multiscale Problems in Nonlinear Mechanics ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Development Project of China Railway
其他责任者	Yuan, Fuping
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/88058]
专题	力学研究所_非线性力学国家重点实验室
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing, Peoples R China;
推荐引用方式 GB/T 7714	Cheng WQ,Yuan FP,Wu XL. Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys[J]. FRONTIERS IN MATERIALS,2021,8:12.
APA	程文强,袁福平,&武晓雷.(2021).Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys.FRONTIERS IN MATERIALS,8,12.
MLA	程文强,et al."Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys".FRONTIERS IN MATERIALS 8(2021):12.