A precipitation-hardened high-entropy alloy with outstanding tensile properties
A precipitation-hardened high-entropy alloy with outstanding tensile properties
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具有出色拉伸性能的沉淀硬化型高熵合金
DOI：
10.1016/j.actamat.2015.08.076
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发表时间：
2016-01-01
期刊：
影响因子：
9.4
通讯作者：
Lu, Z. P.
中科院分区：
文献类型：
--
作者：
He, J. Y.;Wang, H.;Lu, Z. P.
近年来的研究表明，高熵合金（HEAs）具有特殊的结构和热学特性，能显著影响位错运动，提高材料的力学性能，但仅采用HEA基体的强度不足以满足工程应用的需要，迫切需要引入其他强化机制。在这项工作中，我们证明了沉淀纳米尺寸的连贯增强相，即，L1（2）-Ni-3（TLA 1）合金，通过形变热处理和组织控制，获得了优异的室温拉伸性能，这是多种硬化机制，特别是沉淀硬化机制的良好结合。对传统加固理论的适用性和有效性进行了讨论。目前的工作是一个成功的示范，使用综合强化方法来操纵fcc-HEA系统的性能，由此产生的研究结果是重要的，不仅要了解一般的金属材料的强化机制，但也为未来的发展高性能HEA的工业应用。(C)2015 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Recent studies indicated that high-entropy alloys (HEAs) possess unusual structural and thermal features, which could greatly affect dislocation motion and contribute to the mechanical performance, however, a HEA matrix alone is insufficiently strong for engineering applications and other strengthening mechanisms are urgently needed to be incorporated. In this work, we demonstrate the possibility to precipitate nanosized coherent reinforcing phase, i.e., L1(2)-Ni-3(TLA1), in a fcc-FeCoNiCr HEA matrix using minor additions of Ti and Al. Through thermomechanical processing and microstructure controlling, extraordinary balanced tensile properties at room temperature were achieved, which is due to a well combination of various hardening mechanisms, particularly precipitation hardening. The applicability and validity of the conventional strengthening theories are also discussed. The current work is a successful demonstration of using integrated strengthening approaches to manipulate the properties of fcc-HEA systems, and the resulting findings are important not only for understanding the strengthening mechanisms of metallic materials in general, but also for the future development of high-performance HEAs for industrial applications. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.