WReTaMo Refractory High-Entropy Alloy with High Strength at 1600 °C,Advanced Engineering Materials

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WReTaMo Refractory High-Entropy Alloy with High Strength at 1600 °C
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-09-06 , DOI: 10.1002/adem.202100765
Yixing Wan _{1,

2} , Qianqian Wang ₃ , Jinyong Mo _{1,

2} , Zhibin Zhang ₄ , Xin Wang ₄ , Xiubing Liang ₄ , Baolong Shen _{1,

3}

Affiliation

Structural materials with higher melting temperatures and better mechanical properties than superalloys are in high demand in refractory applications. A promising WReTaMo refractory high-entropy alloy (RHEA) with high strength at 1600 °C is fabricated by vacuum arc melting. The WReTaMo RHEA has a body-centered cubic (BCC) structure with a maximal compressive strength of 1140 MPa and Vickers microhardness of 654 HV at room temperature. The alloy displays a strong resistance to high-temperature softening, showing the high maximal compressive strength of 244 MPa at 1600 °C. The deformation of the WReTaMo RHEA compressed at 1600 °C maybe resulted from the grain boundary sliding, which leads to the propagation of the cracks along grain boundaries. Face-centered cubic (FCC) phase forms at the surface region of samples annealed above 1800 °C due to the diffusion of carbon atoms by gas carburizing in the graphite crucible at such high temperatures. The increase in hardness at temperatures above 1600 °C results from the solid solution strengthening of dissolved carbon. The forming ability of the WReTaMo RHEA is also discussed. This work presents a promising high-temperature structural material and fills the vacancy of the mechanical properties of Re-containing RHEAs at 1600 °C.

中文翻译：

1600℃高强度WReTaMo难熔高熵合金

与高温合金相比，具有更高熔化温度和更好机械性能的结构材料在耐火材料应用中的需求量很大。通过真空电弧熔炼制备了一种在 1600 °C 下具有高强度的有前景的 WReTaMo 难熔高熵合金 (RHEA)。WReTaMo RHEA 具有体心立方 (BCC) 结构，在室温下最大抗压强度为 1140 MPa，维氏显微硬度为 654 HV。该合金具有很强的抗高温软化能力，在 1600 °C 时具有 244 MPa 的高抗压强度。WReTaMo RHEA 在 1600 °C 压缩时的变形可能是由晶界滑动引起的，导致裂纹沿晶界扩展。由于在如此高温下石墨坩埚中的气体渗碳导致碳原子扩散，在 1800 °C 以上退火的样品的表面区域会形成面心立方 (FCC) 相。温度高于 1600 °C 时硬度的增加是由于溶解碳的固溶强化所致。还讨论了 WReTaMo RHEA 的形成能力。这项工作提出了一种很有前途的高温结构材料，并填补了含 Re RHEA 在 1600 °C 下机械性能的空白。

更新日期：2021-09-06

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