W对含铌TiAl合金组织与力学性能的影响
Effect of Tungsten Addition on Microstructure and Mechanical Properties of TiAl-based Alloy
孙红亮, 孙 才, 黄泽文, 朱德贵
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作者单位：(西南交通大学 材料先进技术教育部重点实验室, 四川 成都 610031)
中文关键字：TiAl基合金； 钨； 显微组织； 力学性能
英文关键字：TiAl-based alloy; tungsten; microstructure; mechanical properties
中文摘要：研究了W含量对TiAl基合金显微组织和力学性能的影响。结果表明：随W含量的增加，B2相及等轴γ相的尺寸和数量呈逐渐增加的趋势；晶团尺寸和片层间距随W含量的增加呈抛物线变化趋势，添加1%W时，细化效果显著；合金的室温及高温强度随W含量的增加呈逐渐增加趋势，但W对伸长率的影响不大，而持久寿命与W含量呈反相关。
英文摘要：The effects of W content on microstructure and mechanical property of TiAl-based alloy were investigated. The results indicate that the size and amount of β(B2) phase and equiaxed γ phase gradually increase with the increase of W content. The grain size and lamellar spacing obey a parabolic law and can be effectively refined by the addition of 1%W. The tungsten addition can increase the strength at room temperature and high temperature, but have a little effect on the ductility. The creep rupture life has inverse relationship with W content.