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

文献类型：期刊论文

作者Cheng, Wenqiang1,2; Yuan, Fuping1,2; Wu, Xiaolei1,2; Yuan FP(袁福平); Wu XL(武晓雷); Cheng WQ(程文强); Wu XL(武晓雷); Yuan FP(袁福平); Cheng WQ(程文强)
刊名FRONTIERS IN MATERIALS
出版日期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
DOI10.3389/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.
WOS关键词SHORT-RANGE ORDER ; ATOMISTIC SIMULATIONS ; CRCONI ; DEFORMATION ; DUCTILITY ; IMPACT ; NANOPARTICLES ; BEHAVIOR ; STEEL
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
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
通讯作者Yuan, Fuping
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, Wenqiang,Yuan, Fuping,Wu, Xiaolei,et al. Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys[J]. FRONTIERS IN MATERIALS,2021,8:12.
APA Cheng, Wenqiang.,Yuan, Fuping.,Wu, Xiaolei.,袁福平.,武晓雷.,...&Cheng WQ.(2021).Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys.FRONTIERS IN MATERIALS,8,12.
MLA Cheng, Wenqiang,et al."Coupled Strengthening Effects by Lattice Distortion, Local Chemical Ordering, and Nanoprecipitates in Medium-Entropy Alloys".FRONTIERS IN MATERIALS 8(2021):12.

入库方式： OAI收割

来源：力学研究所

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