Alloy design for intrinsically ductile refractory high-entropy alloys
Alloy design for intrinsically ductile refractory high-entropy alloys
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DOI：
10.1063/1.4966659
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发表时间：
2016-10-28
影响因子：
3.2
通讯作者：
Guo, Sheng
中科院分区：
文献类型：
--
作者：
Sheikh, Saad;Shafeie, Samrand;Guo, Sheng
由IV族（Ti、Zr、Hf）、V族（V、Nb、Ta）和VI族（Cr、Mo、W）难熔元素组成的难熔高熵合金（RHEAs）可能是潜在的新一代高温材料。然而，大多数现有的RHEAs缺乏室温延展性，类似于传统的难熔金属和合金。在这里，我们提出了一种合金设计策略，本质上ductilize RHEAs电子理论的基础上，更具体地说，通过控制合金化，以减少价电子的数量。开发了一种新的韧性RHEA，Hf0.5Nb0.5Ta0.5Ti1.5Zr，作为概念验证，其断裂应力接近1GPa，伸长率接近20%。这里的研究结果将揭示在航空航天和发电行业的超高温应用的韧性RHEAs的发展。出版社：AIP Publishing
Refractory high-entropy alloys (RHEAs), comprising group IV (Ti, Zr, Hf), V (V, Nb, Ta), and VI (Cr, Mo, W) refractory elements, can be potentially new generation high-temperature materials. However, most existing RHEAs lack room-temperature ductility, similar to conventional refractory metals and alloys. Here, we propose an alloy design strategy to intrinsically ductilize RHEAs based on the electron theory and more specifically to decrease the number of valence electrons through controlled alloying. A new ductile RHEA, Hf0.5Nb0.5Ta0.5Ti1.5Zr, was developed as a proof of concept, with a fracture stress of close to 1 GPa and an elongation of near 20%. The findings here will shed light on the development of ductile RHEAs for ultrahigh-temperature applications in aerospace and power-generation industries. Published by AIP Publishing.