研究了低弹性模量β-Ti合金[MoTi14]Zr1 (Ti78.2Mo11.2Zr10.6)和[SnTi14]Mo1 (Ti75.7Mo10.9 Sn13.4)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u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.
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