Outstanding fracture toughness combines gigapascal yield strength in an N-doped heterostructured medium-entropy alloy | |
Liu XR(刘潇如)2,3; Zhang SD(张胜德)2,3; Feng H1; Wang J(王晶)3; Jiang P(姜萍)3; Li HB1; Yuan FP(袁福平)2,3; Wu XL(武晓雷)2,3 | |
刊名 | ACTA MATERIALIA |
2023 | |
卷号 | 255页码:119079 |
关键词 | Fracture toughness Work hardening Heterostructure High-entropy alloy Chemical short-range order |
DOI | 10.1016/j.actamat.2023.119079 |
英文摘要 | The superior strength and toughness balance prevails in the face-centered-cubic-structured high/medium-entropy alloys (H/MEAs) of low strength, while a gain in yield strength is normally accompanied by a sacrifice in toughness, leading to the strength and toughness trade-off particularly when yield strength increases to the gigapascal levels. Here, we showed the superior fracture toughness by heterostructuring an N-doped CrCoNi MEA having different levels of yield strength higher than 1 GPa. The fracture toughness was 91 MPa⋅m1/2 at yield strength of 1.3 GPa in the heterogeneous lamella structure and 168 MPa⋅m1/2 at yield strength of 1.0 GPa in the heterogeneous grain structure. The fracture toughness was attributed to forest hardening plus an extra heterodeformation induced hardening. The pile-ups of geometrically necessary dislocations were observed to be formed at the domain boundaries to accommodate strain gradient at the plastic zone of the crack tip. The chemical short-range orders were found for the enhanced strain hardening near the crack tip by the interaction with dislocations. Moreover, a new parameter was proposed to characterize the work hardening capacity at the crack tip by the integral of hardness increment in the plastic zone which shows a linear relation-ship with the Jintegral value during the crack initiation. |
URL标识 | 查看原文 |
语种 | 英语 |
其他责任者 | Yuan, Fuping ; Wu Xiaolei |
内容类型 | 期刊论文 |
源URL | [http://dspace.imech.ac.cn/handle/311007/92291] |
专题 | 力学研究所_非线性力学国家重点实验室 |
作者单位 | 1.School of Metallurgy, Northeastern University, Shenyang 110819, China 2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China 3.State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China |
推荐引用方式 GB/T 7714 | Liu XR,Zhang SD,Feng H,et al. Outstanding fracture toughness combines gigapascal yield strength in an N-doped heterostructured medium-entropy alloy[J]. ACTA MATERIALIA,2023,255:119079. |
APA | Liu XR.,Zhang SD.,Feng H.,Wang J.,Jiang P.,...&Wu XL.(2023).Outstanding fracture toughness combines gigapascal yield strength in an N-doped heterostructured medium-entropy alloy.ACTA MATERIALIA,255,119079. |
MLA | Liu XR,et al."Outstanding fracture toughness combines gigapascal yield strength in an N-doped heterostructured medium-entropy alloy".ACTA MATERIALIA 255(2023):119079. |
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