Evolution of microstructure and phase composition of Ti-3Al-5Mo-4.5V 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: 2325-2330
• 页数: 6页
• 语种: 英文

摘要

The microstructure evolution and phase composition of an α + β titanium alloy,Ti-3Al-5Mo-4.5V (wt.％),have been investigated.Electron probe micro analysis (EPMA) quantitative results manifest that the stability of β3 phase decreases with increasing quenching temperature,which is influenced by the significant variation of β-stabilizing elements concentration.Detailed microstructure analysis shows that the β → ω phase transformation does occur when quenching at 750 ℃ and 800 ℃.The tω-reflections change from incommensurate ω-spots (750 ℃) to ideal ω-spots (800 ℃) as the β stability of the alloy decreases.Further the decrease of β phase stability encourages the formation of athermal α" martensite,which has the following orientation relationships:[111]β //[110]α",[100]β//[100]α" and [-110]β//[00-1]α" with respect to the β matrix.