Sabban Rushikesh, Dash K, Suwas S, Murty B S
Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai, 600036 India.
Department of Materials Engineering, Indian Institute of Science, Bangalore, 560012 India.
J Indian Inst Sci. 2022;102(1):91-116. doi: 10.1007/s41745-022-00299-9. Epub 2022 Mar 24.
The strength-ductility trade-off is an eminent factor in deciding the mechanical performance of a material with regard to specific applications. The strength-ductility synergy is generally inadequate in as-synthesized high entropy alloys (HEAs); however, it can be tailored owing to its tunable microstructure and phase stability. Thermo-mechanical processing (TMP) allows the microstructure to be tailored to achieve desired strength-ductility combination. The additional attribute is evolution of texture, which also significantly influences the mechanical properties. This review presents a critical insight into the role of TMP to achieve superior strength-ductility symbiosis at room temperature in single-phase (FCC, BCC) and multiphase HEA. The role of overall processing strategy of HEAs encompassing rolling and subsequent annealing in relation to the evolution of microstructure and texture in have been discussed. Recently practiced severe plastic deformation processes have also shown promise in improving the strength-ductility combination. The relevance of these processes in the processing of HEAs has also been analysed. At the end, futuristic approaches have been elaborated to enable efficient as well as hassle-free process towards achieving the proficiency of strength-ductility in HEAs.
强度-延展性权衡是决定材料在特定应用中的机械性能的一个重要因素。在合成态的高熵合金（HEA）中，强度-延展性协同效应通常不足；然而，由于其可调节的微观结构和相稳定性，这种协同效应是可以调整的。热机械加工（TMP）能够对微观结构进行调整，以实现所需的强度-延展性组合。另一个特性是织构的演变，它也会对机械性能产生重大影响。本文综述了热机械加工在单相（FCC、BCC）和多相高熵合金中实现室温下优异强度-延展性共生的作用。讨论了包括轧制及后续退火在内的高熵合金整体加工策略在微观结构和织构演变方面的作用。最近实践的严重塑性变形工艺在改善强度-延展性组合方面也显示出了前景。还分析了这些工艺在高熵合金加工中的相关性。最后，阐述了未来的方法，以实现高效且无麻烦的工艺，从而在高熵合金中实现强度-延展性的卓越性能。
