Effect of Mn and V on structure and mechanical properties of high-entropy alloys based on CoCrFeNi system
Effect of Mn and V on structure and mechanical properties of high-entropy alloys based on CoCrFeNi system
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DOI：
10.1016/j.jallcom.2013.12.210
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发表时间：
2014-04-05
影响因子：
6.2
通讯作者：
Senkov, O. N.
中科院分区：
文献类型：
--
作者：
Salishchev, G. A.;Tikhonovsky, M. A.;Senkov, O. N.
研究了等摩尔成分合金FeCrCoNi、FeCrCoNiV、FeCrCoNiMn和FeCrCoNiMnV在凝固和退火状态下的组织和力学性能。FeCrCoNi和FeCrCoNiMn合金在两种条件下均为单相FCC固溶体。而FeCrCoNiV和FeCrCoNiMnV合金由四方晶系的金属间σ相基体和无序的FCC相沉淀物组成。发现这些合金的晶体结构不受退火的影响。一些标准被认为是解释相组成的研究合金。结果表明，V与其他合金元素的相容性差，导致FCC固溶体的显着扭曲，从而促进σ相的形成。测定了这些合金的拉伸和压缩性能以及显微硬度。在含V合金中证明了显著的强化伴随着由于形成σ相而导致的延展性损失。讨论了所研究合金的显微组织形成特点。(C)2013爱思唯尔有限公司版权所有。
Microstructure and mechanical properties of equimolar composition alloys FeCrCoNi, FeCrCoNiV, FeCrCoNiMn and FeCrCoNiMnV were studied in as-solidified and annealed conditions. The FeCrCoNi and FeCrCoNiMn alloys were single-phase FCC solid-solutions in both conditions. However, the FeCrCoNiV and FeCrCoNiMnV alloys consisted of the intermetallic sigma-phase matrix with a tetragonal crystal lattice and precipitates of a disordered FCC phase. The crystal structures of these alloys were found to be not affected by annealing. A number of criteria were considered to explain phase composition of the studied alloys. It was shown that poor compatibility of V with other alloying elements caused significant distortions of FCC solid solution and thus promoted formation of the sigma phase. Tensile and compressive properties of these alloys together with their microhardness were determined. Significant strengthening accompanied by the loss of ductility due to formation of the sigma phase was demonstrated in the V containing alloys. The characteristics of the microstructure formation in the studied alloys were discussed. (C) 2013 Elsevier B.V. All rights reserved.