L12-Strengthened Co-Rich Alloys for High-Temperature Structural Applications: A Critical Review,Advanced Engineering Materials

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L12-Strengthened Co-Rich Alloys for High-Temperature Structural Applications: A Critical Review
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-09-06 , DOI: 10.1002/adem.202100453
Boxuan Cao _{1,

2} , Yilu Zhao _{3,

4} , Tao Yang _{1,

2} , Chain Tsuan Liu _{1,

2,

3}

Affiliation

Tremendous efforts have been made to accelerate the design of advanced high-temperature structural materials, leading to the development of high-performance Ni-based superalloys with both superior thermal stability and creep resistance. However, further gains in the temperature capabilities are difficult to achieve due to the narrow gap between the γ′-solvus temperature and their melting temperatures within Ni-based superalloys. Given the 50–150 °C advantages in the melting points of Co-rich alloys than those of the Ni-based superalloys, as well as the discovery of L1₂ precipitates in the ternary Co–Al–W alloys, the L1₂-strengthened Co-rich alloys are immediately recognized as the promising candidates to be developed as next-generation high-temperature structural materials. Follow-up studies indicate that they also preserve a mild segregation tendency during solidification and superior particle coarsening resistance as compared with Ni-based superalloys. Promising research directions in the field of Co-rich high-temperature alloys are also discussed herein, including thermodynamic-guided alloy design, grain boundary characteristics, and their correlations with mechanical properties, as well as unique deformation mechanisms and particle shearing configurations.

中文翻译：

用于高温结构应用的 L12 强化富钴合金：严格审查

为加速先进高温结构材料的设计做出了巨大努力，从而开发出具有优异热稳定性和抗蠕变性的高性能镍基高温合金。然而，由于 γ'-固溶线温度与其在 Ni 基高温合金中的熔化温度之间的差距很小，因此难以进一步提高温度能力。鉴于富钴合金的熔点比镍基高温合金的熔点高 50-150 °C，以及在三元 Co-Al-W 合金中发现了 L1 ₂析出物，L1 ₂强化的富钴合金立即被认为是有希望开发为下一代高温结构材料的候选材料。后续研究表明，与镍基高温合金相比，它们在凝固过程中也保持了温和的偏析趋势和优异的抗颗粒粗化能力。本文还讨论了富钴高温合金领域有前景的研究方向，包括热力学引导的合金设计、晶界特性及其与机械性能的相关性，以及独特的变形机制和粒子剪切配置。

更新日期：2021-10-21

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