Research of microstructure and mechanical behavior on duplex (α + β) Ti–4.8Al–2.5Mo–1.4V alloy

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• 作者：Pei-Wen Peng ; Keng-Liang Ou ; Chih-Yeh Chao ; Yung-Ning Pan ; Chau-Hsiang Wang
• 关键词：Titanium alloy ; Mechanical properties ; Transmission electron microscopey ; Microstructure ; Damping coefficient
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：4 February 2010
• 年：2010
• 卷：490
• 期：1-2
• 页码：661-666
• 全文大小：1186 K

文摘

The microstructure and mechanical behavior of the duplex Ti–4.8Al–2.5Mo–1.4V (Ti14) alloy were investigated by means of optical microscopy, electron microscopy, experimental model analysis, and hardness and tensile testing. During heat-treatment at between 600 and 1000 °C, the phase transformation sequence was found to be (α + β) → (α + β + α′) → (α′ + α″ + residual β). The (α′ + α″ + residual β) structure exhibited the maximum yield strength (σ_y = 920 MPa), hardness (HR_C 36), and damping coefficient (188.3 × 10⁻⁴). However, the (α + β) structure achieved the greatest elongation (15 % ). It is believed that the lath-like α′ martensite not only increases the tensile strength, but also enhances the hardness of the Ti14 alloy. Moreover, it also plays a crucial role in increasing the damping capacity of the Ti14 alloy.