Mechanical properties and deformation mechanisms of Ti-3Al-5Mo-4.5 V alloy with varied β3 phase stability

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2018,（12）
• 页码范围: 2507-2514
• 页数: 8页
• 语种: 英文

摘要

Evolution of deformation mechanisms and mechanical properties ofTi-3Al-5Mo-4.5 V alloy with different β phase stability have been systematically investigated.β phase stability alteration is achieved through quenching temperature variation from dual α + β field (700 ℃) to single β field (880℃).Tensile tests at ambient temperature show that apparent yield strength of the alloy experiences an abrupt decrease followed by a significant increase from 700 ℃ to 880 ℃.Work hardening behavior is characterized by transition from the initial two-regime feature to the three-stage outlook.Concurrently,the maximum working hardening rate drops from 14000MPa to 3000MPa,which is concurrent with the shrinking volume fraction of primary α phase.Detailed discussion about the relationship between deformation mechanisms and β phase stability has been outlined.