Abstract A novel metastable β-Ti alloy Ti-4Mo-3Cr-1Fe with high strength and high ductility was developed through controlling the alloyʼs stability and deformation mechanisms. The microstructure consists of randomly oriented β-grains containing an even distribution of athermal ω precipitates. Under tensile loading, the alloy exhibits unprecedented and comprehensive mechanical properties including a high yield strength of 870 MPa, excellent total elongation of 41% and an ultrahigh strain hardening rate of 2.5 GPa. Based on investigations of deformation microstructures, the superior mechanical properties are attributed to stress-induced formation of a complex nano-scale hierarchical twin structure which is promoted by reversion of ω precipitates.

中文翻译：

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通过应力诱导的分层孪晶结构同时增强亚稳态 β-Ti 合金的强度和延展性

摘要 通过控制合金的稳定性和变形机制，开发了一种新型的高强度、高延展性亚稳态β-Ti合金Ti-4Mo-3Cr-1Fe。微观结构由随机取向的 β 晶粒组成，其中包含均匀分布的非热 ω 析出物。在拉伸载荷下，该合金表现出前所未有的综合力学性能，包括 870 MPa 的高屈服强度、41% 的优异总伸长率和 2.5 GPa 的超高应变硬化率。基于对变形微观结构的研究，优异的机械性能归因于应力诱导形成复杂的纳米级分层孪晶结构，该结构由 ω 沉淀物的反转促进。