材料科学
Twip公司
晶体孪晶
粒度
高熵合金
可塑性
应变率
极限抗拉强度
变形机理
超塑性
冶金
晶界强化
相(物质)
晶界
复合材料
合金
微观结构
化学
有机化学
作者
Jie Li,Bo Zhang,Lichong Niu,Minghe Zhang,Yunli Feng
出处
期刊:Isij International
[The Iron and Steel Institute of Japan]
日期:2024-02-14
卷期号:64 (6): 1067-1077
标识
DOI:10.2355/isijinternational.isijint-2023-451
摘要
Fe50Mn30Co10Cr10 dual-phase metastable high-entropy alloys(HEAS) have gained significant attention for their outstanding mechanical properties. However, limited research has explored the relationship between grain size and strain rate sensitivity (SRS) in dual-phase HEAS. Current investigations primarily focus on pure metals and single-phase FCC HEAS. To address this gap, this study examines the impact of grain size on the deformation behavior and SRS of TRIP-(Fe50Mn30Co10Cr10)97Al3 dual-phase HEAS. Two variants of dual-phase HEAS were prepared, distinguished by their grain sizes (2.86 μm, labeled Fine Grain or FG, and 5.25 μm, termed Coarse Grain or CG), via the vacuum melting method. Subsequent tensile tests were conducted at varying strain rates, ranging from 0.001/s to 0.02/s. The findings unveil a robust grain size dependency in the phase transformation and deformation twinning of the (Fe50Mn30Co10Cr10)97Al3 dual-phase HEA during tensile deformation. Within the FeMnCoCrAl HEA system, characterized by a dual-phase structure, both TRIP (Transformation-Induced Plasticity) and TWIP (Twinning-Induced Plasticity) effects intensify with increasing grain size. Additionally, as the strain rate increases, the TRIP effect gradually diminishes while the TWIP effect strengthens. Notably, the strain rate sensitivity index 'm' exhibits a downward trend with an increase in grain size, distinguishing it from the behavior observed in single-phase FCC HEAS. This study conducts an in-depth analysis of grain size's impact on the SRS of (Fe50Mn30Co10Cr10)97Al3 dual-phase HEA, scrutinizing micro-level aspects encompassing phase transformation, deformation twinning, and grain boundary slip. The findings provide essential theoretical insights for designing HEAS tailored for applications requiring high strain rates.
科研通智能强力驱动
Strongly Powered by AbleSci AI