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Design of a low density refractory high entropy alloy in non-equiatomic W–Mo–Cr–Ti–Al system
Vacuum ( IF 4 ) Pub Date : 2020-11-01 , DOI: 10.1016/j.vacuum.2020.109614
Hamed Naser-Zoshki , Ali-Reza Kiani-Rashid , Jalil Vahdati-Khaki

Abstract A new refractory high entropy alloy (RHEA) with non-equiatomic composition of W10Mo27Cr21Ti22Al20 was designed based on empirical rules and CALPHAD approach. Calculated results showed that W10Mo27Cr21Ti22Al20 RHEA had lower density and higher melting temperature than that of equiatomic alloy. The designed alloy was prepared by vacuum arc melting then the crystal structure, microstructure, chemical composition, density, hardness and compressive strength had been evaluated. The alloy exhibited a BCC solid solution as major phase with typical dendritic microstructures. The experimental results confirmed calculated results, suggesting a BCC solid solution phase. The density of the alloy was 7.48 g/cm3, which was approximately close to the calculated value, 7.73 g/cm3. However, the measured hardness value (511 kg/mm2) was significantly higher than the calculated value (125 kg/mm2), indicating the effect of solid solution strengthening. This alloy had compressive yield strengths of 1245 MPa at room temperature, 510 MPa at 600 °C, 201 MPa at 1000 °C and 105 MPa at1200 °C. Compressive strain of the alloy was limited at room temperature, but it increased significantly to above 60% at 1000 °C and 1200 °C. Comparing with four conventional superalloys Inconel 718, Waspaloy, Hastaloy X and Haynes 230, the studied RHEA shows lower density and superior high-temperature yield strength.

中文翻译:

非等原子 W-Mo-Cr-Ti-Al 系低密度难熔高熵合金的设计

摘要 基于经验法则和CALPHAD方法,设计了一种具有非等原子组成的W10Mo27Cr21Ti22Al20的新型难熔高熵合金(RHEA)。计算结果表明,与等原子合金相比,W10Mo27Cr21Ti22Al20 RHEA 具有较低的密度和较高的熔化温度。采用真空电弧熔炼方法制备了设计的合金,并对晶体结构、显微组织、化学成分、密度、硬度和抗压强度进行了评价。该合金表现出 BCC 固溶体作为主要相,具有典型的树枝状微观结构。实验结果证实了计算结果,表明为 BCC 固溶体相。合金的密度为 7.48 g/cm3,接近计算值 7.73 g/cm3。然而,实测硬度值(511 kg/mm2)明显高于计算值(125 kg/mm2),表明固溶强化效果。该合金的压缩屈服强度在室温下为 1245 MPa,在 600 °C 下为 510 MPa,在 1000 °C 下为 201 MPa,在 1200 °C 下为 105 MPa。该合金的压缩应变在室温下受到限制,但在 1000°C 和 1200°C 时显着增加至 60% 以上。与四种常规高温合金 Inconel 718、Waspaloy、Hastaloy X 和 Haynes 230 相比,所研究的 RHEA 显示出更低的密度和优异的高温屈服强度。该合金的压缩应变在室温下受到限制,但在 1000°C 和 1200°C 时显着增加至 60% 以上。与四种常规高温合金 Inconel 718、Waspaloy、Hastaloy X 和 Haynes 230 相比,所研究的 RHEA 显示出更低的密度和优异的高温屈服强度。该合金的压缩应变在室温下受到限制,但在 1000°C 和 1200°C 时显着增加至 60% 以上。与四种常规高温合金 Inconel 718、Waspaloy、Hastaloy X 和 Haynes 230 相比,所研究的 RHEA 显示出更低的密度和优异的高温屈服强度。
更新日期:2020-11-01
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