一种兼具高强度、高应变硬化率和高塑性的新型钛合金

A new titanium alloy with a combination of high strength,high strain hardening and improved ductility

本研究设计了一种三元亚稳β钛合金Ti-9Mo-6W(质量百分数)。由于该合金变形时会联合出现相变诱发塑性效应和孪晶诱发塑性效应,使该合金的加工硬化速率可以接近2 100MPa,均匀变形能力高于35%。为了深入了解Ti-9Mo-6W合金的变形过程,对其变形过程中的显微组织进行了详细分析。结果表明,Ti-9Mo-6W合金变形过程中存在{332}<113>机械孪晶、应力诱发ω相、应力诱发α"马氏体等不同的变形机制,综合作用使合金内部最终形成了具有高度协合性的复杂网络变形组织。

A ternary β-metastable titanium Ti–9Mo–6W（wt.%） was designed. A very high work hardening rate close to 2100 MPa and a uniform deformation larger than 35% were recorded, thanks to combined transformation-induced plasticity and twinning-induced plasticity effects. In this paper,detailed microstructural analysis was performed to understand the deformation process. Various mechanisms, {332}113mechanical twinning,stress-induced x phase and stress-induced ω phase and stress-induced α＂ martensite were identified after mechanical testing, resulting in a complex network of deformed microstructures with very special synergetic features.