ABSTRACT

The tradeoff between strength and ductility has long been identified as the ‘Achilles’ heel’ of the mechanical properties in engineering applications. Metal hybrids processed by severe plastic deformation (SPD) have gained significant attention in recent years, as they have shown potential for enhancing strength and ductility simultaneously through different heterostructured designs. Among SPD processes, high-pressure torsion (HPT) is considered the most effective in grain refinement and offers excellent versatility for synthesising new materials with a wide variety of experimental setups and processing parameters. This review article describes the current state-of-the-art of metal hybrids processed by HPT, characterised by heterogeneous microstructures (i.e. nanoscale and/or microscale), through a comprehensive study of their synthesis-microstructure-property relationships. The potential of HPT-processed hybrids is highlighted and discussed along with their limitations. Suggestions are provided with the aim to advance current research trends towards future application in high-impact technologies, including the biomedical and microelectronic industries.

摘要

长期以来，强度和延展性之间的权衡一直被认为是工程应用中机械性能的“致命弱点”。近年来，通过严重塑性变形 (SPD) 加工的金属杂化物受到了极大的关注，因为它们显示出通过不同的异质结构设计同时提高强度和延展性的潜力。在 SPD 工艺中，高压扭转 (HPT) 被认为是最有效的晶粒细化工艺，并为合成具有各种实验装置和工艺参数的新材料提供了出色的多功能性。这篇综述文章描述了由 HPT 加工的金属杂化物的当前最新技术，其特征在于异质微结构（即纳米级和/或微米级），通过对其合成-微观结构-性能关系的全面研究。强调并讨论了 HPT 处理的杂种的潜力及其局限性。提供的建议旨在推动当前的研究趋势，以推动未来在高影响技术（包括生物医学和微电子行业）中的应用。