High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys
High-Throughput Nanomechanical Screening of Phase-Specific and Temperature-Dependent Hardness in AlxFeCrNiMn High-Entropy Alloys
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DOI：
10.1007/s11837-019-03714-2
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发表时间：
2019-10-01
期刊：
影响因子：
2.6
通讯作者：
Mara, Nathan A.
中科院分区：
文献类型：
--
作者：
Chen, Youxing;Hintsala, Eric;Mara, Nathan A.
由于缺乏高通量测试协议，极端条件下使用的结构材料的开发受到阻碍。在这里，展示了一种在真空气氛下将高通量纳米压痕测绘与精确温度控制相结合的方法。高熵合金（HEA）可能具有下一代核应用中高温结构材料所需的强度和稳定性。这些合金，包括本工作中提出的成分变化 AlxFeCrNiMn (x = 0, 0.3, 1)，具有独特的微观结构形态，纳米压痕图揭示了不同相的机械行为，作为温度高达 400 摄氏度的函数。FeCrNiMn (Al = 0) 由面心立方 (FCC) 基体和体心立方 (BCC) 沉淀物组成，在高温下两相都表现出显着的软化。温度。相比之下，Al0.3FeCrNiMn 中的 FCC 相和 FCC-BCC 相在 400 摄氏度下均表现出约 90% 的室温硬度保留，而具有 BCC 和 B2 结构的 AlFeCrNiMn 则表现出类似的 85% 的硬度保留。
Development of structural materials for service under extreme conditions is slowed by the lack of high-throughput test protocols. Here, a method that integrates high-throughput nanoindentation mapping with precise temperature control under a vacuum atmosphere is demonstrated. High-entropy alloys (HEAs) may possess the strength and stability required of high-temperature structural materials in next-generation nuclear applications. These alloys, including the compositional variation AlxFeCrNiMn (x = 0, 0.3, 1) presented in this work, have distinct microstructural morphologies, and nanoindentation mapping reveals the mechanical behavior of the distinct phases as a function of temperature up to 400 degrees C. FeCrNiMn (Al = 0) consists of a face-centered cubic (FCC) matrix with body-centered cubic (BCC) precipitates and exhibits significant softening in both phases at elevated temperature. In contrast, both the FCC phase and FCC-BCC phases present in Al0.3FeCrNiMn show approximately 90% retention of the room temperature hardness at 400 degrees C, and AlFeCrNiMn with BCC and B2 structures shows a similar 85% retention of hardness.