Transformation Induced Plasticity Effects of a Non-Equal Molar Co-Cr-Fe-Ni High Entropy Alloy System
Transformation Induced Plasticity Effects of a Non-Equal Molar Co-Cr-Fe-Ni High Entropy Alloy System
复制标题
非等摩尔Co-Cr-Fe-Ni高熵合金体系的相变诱导塑性效应
DOI：
10.3390/met8050369
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发表时间：
2018-05-01
期刊：
影响因子：
2.9
通讯作者：
Yin, Fuxing
中科院分区：
文献类型：
--
作者：
Fang, Wei;Chang, Ruobin;Yin, Fuxing
由于相变诱导塑性效应（TRIP），亚稳态工程策略是高熵合金（HEA）的一个重要课题。在这项工作中，研究了 Co-Cr-Fe-Ni HEA 的 TRIP 效应。结果表明，Co35Cr25Fe40-xNix (x = 0-15 at %) HEA 中发生拉伸变形诱发的马氏体相变。抗拉强度（760 MPa-1000 MPa）和延伸率（65-35%）的优异组合归功于Co和Cr的固溶强化以及TRIP效应。在非等摩尔Co-Cr-Fe-Ni体系中，随着Ni含量的降低，堆垛层错能（SFE）值降低；因此，发生TRIP现象。通过对Co-Cr-Fe-Ni多组分相图三个不同区域的实验研究，VEC接近8.0的面心立方结构Co-Cr-Fe-Ni HEAs更加亚稳态，更容易发生TRIP现象。
Metastability-engineering strategy is an important topic for high entropy alloys (HEAs), owing to the transformation-induced plasticity effect (TRIP). In this work, TRIP effects of Co-Cr-Fe-Ni HEAs are investigated. Results indicate the tensile deformation-induced martensitic transformation occurs in Co35Cr25Fe40-xNix (x = 0-15 at %) HEAs. The excellent combination of tensile strength (760 MPa-1000 MPa) and elongation (65-35%) owe to solid solution strengthening of Co and Cr, and the TRIP effect. In non-equal molar Co-Cr-Fe-Ni systems, with the decrease of Ni content, the values of stacking fault energy (SFE) decrease; thus, TRIP phenomena occurs. Based on the experimental investigation in three different regions of the Co-Cr-Fe-Ni multicomponent phase diagram, the face-centered cubic structured Co-Cr-Fe-Ni HEAs with VEC of similar to 8.0 is more metastable, and TRIP phenomena are more likely to occur.