(西北工业大学 凝固技术国家重点实验室，西安 710072)
摘 要: 亚稳β钛合金的力学性能与其变形机制密切相关。在稳定性很高的β基体中位错滑移是唯一的变形机制，而随着β基体稳定性的降低，除位错滑移之外的其他变形机制如{112} 变形孪晶、应力诱发β→ω相变、{332} 变形孪晶以及应力诱发β→α″相变等变形机制会逐渐产生。这些变形机制可以导致孪晶/相变诱导塑性的效应，能显著提高相应合金的加工硬化率和塑性。近年来关于这些变形机制的研究取得了重要进展，不同变形机制之间尤其是变形孪晶与应力诱发相变之间的内在联系被揭示出来，为现有合金的性能优化和新型合金的设计开发提供了重要的理论指导。本文综述了这些研究进展，并对其中存在的一些不足进行了分析。
关键字: 亚稳β钛合金；变形孪晶；应力诱发相变；微观组织；力学性能
（State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China）
Abstract:The deformation behavior of metastable β titanium alloys is dependent on their deformation mechanisms. In fully stable β titanium alloys, dislocation slip is the only deformation mechanism, while additional deformation mechanisms such as {112} twinning, stress-induced β→ω transformation, {332} twinning and stress-induced β→α″ transformation occur with the decrease of β phase stability. In recent years great progress has been made in the study of these deformation mechanisms. The relationship between different deformation mechanisms, especially that between deformation twinning and stress-induced phase transformation, was revealed. In the present paper, the relative studies were reviewed and our perspective on the direction of future research efforts was provided.
Key words: metastable β titanium alloy; deformation twinning; stress-induced phase transformation; microstructure; mechanical property
