Abstract In this study, a design strategy employing stress-induced β to hexagonal α′ martensitic transformation to develop a novel Ti-15Nb-5Zr-4Sn-1Fe alloy with ultrahigh strain hardening rate (~6.1 GPa) is reported. Microstructural investigations reveal that the superior strain hardening response is contributed by stress-induced β to α′ transformation with accompanying reversion of athermal ω and profuse internal { 1 ¯ 011} 1 ¯ 2> and {11 2 ¯ 2} 2 ¯ 3> α′ mechanical twinning which promote twin-twin interactions, imparting high strength and outstanding uniform elongation. This study may serve as a template for developing new class of transformation-induced plasticity (TRIP) and twinning-induced plasticity (TWIP) Ti alloys based on β to α′ martensitic transformation.

中文翻译：

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相变诱导塑性和孪晶诱导塑性钛合金中的超高应变硬化

摘要 在这项研究中，报告了一种利用应力诱导的 β 到六方 α' 马氏体相变的设计策略，以开发具有超高应变硬化率 (~6.1 GPa) 的新型 Ti-15Nb-5Zr-4Sn-1Fe 合金。微观结构研究表明，优越的应变硬化响应是由应力引起的 β 到 α' 转变以及伴随无热 ω 的反转和大量内部 { 1¯ 011} 1 ¯ 2> 和 {11 2 ¯ 2} 2 ¯ 3> α 贡献的′ 促进孪晶相互作用的机械孪晶，赋予高强度和出色的均匀伸长率。该研究可作为开发基于 β 到 α' 马氏体相变的新型相变诱导塑性 (TRIP) 和孪晶诱导塑性 (TWIP) Ti 合金的模板。