陈国清,汤华平,王琪,付雪松,周文龙

• 1:大连理工大学材料科学与工程学院

摘要(Abstract)：

采用元素粉末经热压烧结法制备了新型Ti-43.5Al-4Nb-1Mo-0.3B合金,研究了热处理工艺对合金组织中β相转变行为及其力学性能的影响。结果表明,粉末冶金态Ti Al合金中β相呈条带状,与γ相形成块状组织。热处理能显著改善材料的组织均匀性,使B2/γ块状组织逐渐转变成α_2/γ层片组织,β相转变行为特征为吸收Ti、Al元素,排出Nb元素。温度是热处理过程中组织均匀化的主控因素,在共析温度Te附近热处理时(1100~1160℃/24 h),B2相逐渐溶解但不能完全消除,而在α相转变温度Tα以上短时热处理和稳定化低温热处理后,如1400℃/2 h/FC+850℃/6 h/AC,B2/γ块状组织可完全消除,且组织粗化不严重。初始态B2相纳米硬度为6.69 GPa,弹性模量为175.4 GPa,热处理导致其纳米硬度和弹性模量逐渐降低。

关键词(KeyWords)： Ti Al合金;热处理;微观组织;β相

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51175059);; 中央高校基本科研业务费专项资金(DUT14YQ105);; 新世纪优秀人才支持计划资助(NCET-10-0278)

作者(Author): 陈国清,汤华平,王琪,付雪松,周文龙

DOI: 10.13289/j.issn.1009-6264.2015.12.004

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