| 微量B对铸态TiAl基合金显微组织及热变形行为的影响 |
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| 引用本文： | 李建波,刘咏,王岩,刘彬,杨广宇.微量B对铸态TiAl基合金显微组织及热变形行为的影响[J].粉末冶金材料科学与工程,2012(4):414-422. |
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| 作者姓名： | 李建波 刘咏 王岩 刘彬 杨广宇 |
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| 作者单位： | 中南大学粉末冶金国家重点实验室;中南大学航空航天学院;日本东北大学金属研究院 |
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| 基金项目： | 国家重点基础研究发展规划(973计划)资助项目(2011CB605505);国家高技术研究发展计划(863计划)资助项目(2008AA03A233);国家自然科学基金资助项目(51174233) |
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| 摘 要： | 采用电弧熔炼法制备含微量B元素的Ti-43Al-4Nb-1.4W-xB(x=0.2,0.4,0.6,0.8。数据为原子分数,%)合金;利用光学显微镜(OM)和扫描电镜(SEM)研究B含量对该铸态合金显微组织的影响,并通过热模拟压缩试验研究温度为1 050~1 200℃、应变速率为10 3~1 s 1的变形条件下Ti-43Al-4Nb-1.4W-0.6B合金的热变形行为,分析该合金在不同变形条件下的组织演化规律。结果表明:当B含量(质量分数)达到0.6%时,合金组织明显细化;Ti-43Al-4Nb-1.4W-0.6B合金的高温压缩流变应力随变形速率增加以及变形温度降低而增加;其峰值应力与变形条件之间的函数关系可用双曲正弦函数来描述,并以此求得高温变形激活能为580.68 kJ/mol;加入0.6%B对合金动态再结晶形核起到一定的促进作用,热变形后,合金发生明显的动态再结晶。
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| 关 键 词： | 微量B TiAl基合金 显微组织 热变形 变形激活能 动态再结晶 |
Effect of trace boron element on microstructure and hot deformation behaviors of as-cast TiAl based alloy |
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| LI Jian-bo,LIU Yong,WANG Yan,LIU Bin,YANG Guang-yu.Effect of trace boron element on microstructure and hot deformation behaviors of as-cast TiAl based alloy[J].materials science and engineering of powder metallurgy,2012(4):414-422. |
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| Authors: | LI Jian-bo LIU Yong WANG Yan LIU Bin YANG Guang-yu |
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| Affiliation: | 1(1.State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China;2.School of Aeronautics and Astronautics,Central South University,Changsha 410083,China;3.Institute of metals research,Tohoku University,Sendai 980-8577,Japan) |
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| Abstract: | The effect of B content on the microstructure and hot deformation behavors of as-cast Ti-43Al-4Nb-1.4W-xB alloy was systematically investigated using optical microscopy and scanning electron microscopy.The hot deformation behaviors of the Ti-43Al-4Nb-1.4W-0.6B alloy at temperatures from 1 050 ℃ to 1 200 ℃ with strain rates from 10 3to 1 s 1 were studied by thermal simulation compression tests.The results indicate that a refined microstructure for as-cast Ti-43Al-4Nb-1.4W-xB alloy can be obtained when the content of B reaches to 0.6%.The flow stress of Ti-43Al-4Nb-1.4W-0.6B alloy increases with increasing strain rate and decreasing deformation temperature.The relationship between peak stress and deformation conditions for the alloy can be described by a hyperbolic-sine type equation,and the apparent activation energy calculated is 580.68 kJ/mol.Dynamic recrystallization occurs apparently during hot deformation of the alloy.The addition of 0.6% B can accelerate the nucleation of dynamic recrystallization of the alloy. |
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| Keywords: | trace B element TiAl based alloy microstructure hot deformation deformation activation energy dynamic recrystallization |
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