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研究了低弹性模量β-Ti合金[MoTi14]Zr1Ti78.2Mo11.2Zr10.6和[SnTi14]Mo1Ti75.7Mo10.9Sn13.4中第二相析出对弹性模量和力学性能的影响及其拉伸过程中合金组成相的变化.利用Cu模吸铸快冷技术制备了直径6 mm的合金棒,并采用XRD和TEM分析合金拉伸前后的相析出行为及组织.结果表明,在β基体上只有少量α″的析出使得[SnTi14]Mo1合金具有较低的弹性模量(70 GPa),而ω相的存在使得[MoTi14]Zr1合金的弹性模量略高(80 GPa);且[SnTi14]Mo1合金中较细的薄片状β孪晶组织使得合金具有优良的力学性能.在拉伸过程中,[MoTi14]Zr1合金中应力诱发的马氏体含量增加,而在[SnTi14]Mo1合金中β基体晶粒易于发生扭转,从而合金塑性提高.
The effects of the second phase precipitation on the elastic moduli and mechanical properties of [MoTi14] Zr1Ti78.2Mo11.2Zr10.6 and [SnTi14] Mo1Ti75.7Mo10.9Sn13.4 in the low elastic modulus β-Ti alloys and their tensile processes Phase alloy was prepared.The alloy rod with the diameter of 6 mm was prepared by Cu die-casting rapid cooling technique and the phase precipitation behavior and microstructure of the alloy before and after stretching were analyzed by XRD and TEM.The results showed that only a small amount α "precipitates the [SnTi14] Mo1 alloy with a lower elastic modulus (70 GPa), while the presence of ω phase makes the elastic modulus of the [MoTi14] Zr1 alloy slightly higher (80 GPa) In the [MoTi14] Zr1 alloy, the stress-induced martensite content increases, whereas in the [SnTi14] Mo1 alloy, β-based bulk crystal The particles are prone to twisting, which increases the plasticity of the alloy.