High-Temperature Tensile Strength of Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy (High-Entropy Alloy)
High-Temperature Tensile Strength of Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex Alloy (High-Entropy Alloy)
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DOI：
10.1007/s11837-015-1484-7
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发表时间：
2015-10-01
期刊：
影响因子：
2.6
通讯作者：
Glatzel, U.
中科院分区：
文献类型：
--
作者：
Daoud, H. M.;Manzoni, A. M.;Glatzel, U.
在1220 A ℃下均匀化20 h，随后在900 A ℃下时效5 h和50 h，新型Al 10 Co 25 Cr 8 Fe 15 Ni 36 Ti 6组成复杂合金（高熵合金）产生由嵌入面心立方固溶体γ基质中的L1（2）有序γ '相以及针状B2沉淀物（NiAl）组成的显微组织。γ '相的体积分数近似于46%，针状B2沉淀物的体积分数<5%，这与相图方法（CALPHAD，使用Thermo-Calc软件和TTNi 7数据库; Thermo-Calc软件，斯德哥尔摩，瑞典）计算的预测一致。高温拉伸试验在室温、600 A ℃、700 A ℃、800 A ℃和1000 A ℃下进行。在所有测试温度下，两种热处理试样的拉伸强度和断裂伸长率都非常高。抗拉强度的值已与著名的合金800 H和Inconel 617的文献数据进行了比较，并根据观察到的显微组织进行了讨论。
Homogenizing at 1220A degrees C for 20 h and subsequent aging at 900A degrees C for 5 h and 50 h of a novel Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy (high-entropy alloy) produces a microstructure consisting of an L1(2) ordered gamma' phase embedded in a face-centered cubic solid-solution gamma matrix together with needle-like B2 precipitates (NiAl). The volume fraction of gamma' phase is similar to 46% and of needle-like B2 precipitates < 5%, which is in accordance with the prediction of calculation of phase diagram method (CALPHAD using Thermo-Calc software with TTNi7 database; Thermo-Calc Software, Stockholm, Sweden). The high-temperature tensile tests were carried out at room temperature, 600A degrees C, 700A degrees C, 800A degrees C, and 1000A degrees C. The tensile strength as well as the elongation to failure of both heat-treated specimens is very high at all tested temperatures. The values of tensile strength has been compared with literature data of well-known Alloy 800H and Inconel 617, and is discussed in terms of the observed microstructure.