| Improving ductility by coherent nanoprecipitates in medium entropy alloy | |
Zhang ZH(张子晗)1,2 ; Ma Y(马彦)1,3; Yang MX(杨沐鑫)1; Jiang P(姜萍)1; Feng HQ(冯航旗)1; Zhu, Yuntian3; Wu XL(武晓雷)1,2; Yuan FP(袁福平)1,2
| |
| Corresponding Author | Ma, Yan([email protected]) ; Yuan, Fuping([email protected]) |
| Source Publication | INTERNATIONAL JOURNAL OF PLASTICITY
 |
| 2024 | |
| Volume | 172Pages:13 |
| ISSN | 0749-6419 |
| Abstract | Controlling precipitates in spatial density and size distribution is essential for tailoring the microstructure and mechanical properties through precipitation hardening. We herein obtained heterogeneous grain structures with coherent L12 nanoprecipitates in (CrCoNi)94Al4Ti2 medium entropy alloy (MEA) by annealing and aging. Additional pre-aging leads to a high spatial density and more random distribution nucleation sites of the coherent L12 nanoprecipitates. The preaging doubled the ductility without apparently sacrificing the strength. Transmission electron microscopy (TEM) revealed that, in pre-aged MEA, finely dispersed L12 nanoprecipitates with higher spatial density were sheared by dislocation, promoting planar slips, which favors geometrically necessary dislocations (GNDs) piling up to increased hetero-deformation-induced (HDI) stress and work-hardening. Stacking faults, Lomer-Cottrell locks, and 9R structures were formed in aged and pre-aged MEA after tensile deformation. The formation of these defects enormously enhanced strain hardening by blocking dislocation movements and accumulating dislocations. Moreover, a higher frequency of interactions between defects and coherent L12 nanoprecipitates can be observed in the pre-aged MEA due to the more randomly distributed L12 nanoprecipitates, substantially increasing ductility. This work demonstrates a new route to achieving a super strength-ductility combination of single-phase FCC high entropy alloys by nanoscale coherent precipitation strengthening. |
| Keyword | Medium-entropy alloys Ductility Coherent nanoprecipitates 9R structures Precipitation hardening |
| DOI | 10.1016/j.ijplas.2023.103821 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001135202500001 |
| WOS Keyword | LOCAL LATTICE DISTORTION ; SHORT-RANGE ORDER ; MEDIATED FORMATION ; HIGH-STRENGTH ; MECHANISMS ; PRECIPITATION ; NANOPARTICLES ; DEFORMATION |
| WOS Research Area | Engineering ; Materials Science ; Mechanics |
| WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary ; Mechanics |
| Funding Project | National Natural Science Foundation of China (NSFC) Basic Science Center Program[11988102] ; National Key Research & Development Program of China[2017YFA0204402] ; National Natural Science Foundation of China[52192591] ; National Natural Science Foundation of China[11790293] ; Hong Kong Research Grants Council[GRF 11214121] ; Hong Kong Institute for Advanced Study |
| Funding Organization | National Natural Science Foundation of China (NSFC) Basic Science Center Program ; National Key Research & Development Program of China ; National Natural Science Foundation of China ; Hong Kong Research Grants Council ; Hong Kong Institute for Advanced Study |
| Classification | 一类 |
| Ranking | 1 |
| Contributor | Ma, Yan ; Yuan, Fuping |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/94025 |
| Collection | 非线性力学国家重点实验室 |
| Affiliation | 1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China; 3.City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China |
| Recommended Citation GB/T 7714 | Zhang ZH,Ma Y,Yang MX,et al. Improving ductility by coherent nanoprecipitates in medium entropy alloy[J]. INTERNATIONAL JOURNAL OF PLASTICITY,2024,172:13.Rp_Au:Ma, Yan, Yuan, Fuping |
| APA | 张子晗.,马彦.,杨沐鑫.,姜萍.,冯航旗.,...&袁福平.(2024).Improving ductility by coherent nanoprecipitates in medium entropy alloy.INTERNATIONAL JOURNAL OF PLASTICITY,172,13. |
| MLA | 张子晗,et al."Improving ductility by coherent nanoprecipitates in medium entropy alloy".INTERNATIONAL JOURNAL OF PLASTICITY 172(2024):13. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| Improving ductility （20557KB） | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Download | |
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment