杨亮,辛景景,张有为,包春玲,张来启,林均品.β-γ高Nb-TiAl合金组织转变及拉伸性能研究[J].稀有金属材料与工程,2017,46(10):3005~3010.[Yang liang,Xin Jingjing,Zhang Youwei,Bao Chunling,Zhang Laiqi,Lin Junpin.Microstructure Evolution and Tensile Properties of β-γ TiAl Alloy Containing High Content of Nb[J].Rare Metal Materials and Engineering,2017,46(10):3005~3010.]
β-γ高Nb-TiAl合金组织转变及拉伸性能研究
投稿时间:2015-07-18  修订日期:2015-09-22
中文关键词:  β凝固  β-γ高Nb-TiAl合金  组织转变  拉伸性能  Cr和Mn
基金项目:国家重点基础研究发展规划资助(项目号2011CB605501); 国家自然科学基金资助(项目号51271016)
中文摘要:
      本文研究了β稳定元素Cr和Mn的掺杂对高Nb-TiAl合金的组织、相组成、凝固路径及室温、高温拉伸性能的影响。实验结果表明,Ti-45Al-8Nb-0.4B(原子分数,%,下同)合金中分别加入2Cr、2Mn或1Cr1Mn后,铸态组织中B2相逐步增加,而α2相逐步减小。1Cr1Mn合金转变为由γ+B2两相组成的新型β-γ高Nb-TiAl合金。凝固路径由L→β→β+α→α+γ+β→α2+γ+B2转变为L→β→β+γ→B2+γ。Cr和Mn的同时添加具有更明显的β相稳定作用。室温拉伸结果表明,随着B2相含量的增加,合金的强度与延伸率均降低。而在900℃条件下,合金延伸率出现先降低后升高的现象。这说明,高温下合金中β相含量达到一定程度时(本研究为14.4 %),有利于协调变形。
Microstructure Evolution and Tensile Properties of β-γ TiAl Alloy Containing High Content of Nb
英文关键词:β solidification  β-γ high Nb-TiAl alloy  microstructure evolution  tensile properties  Cr and Mn
英文摘要:
      The variation of microstructure evolution, phase composition, solidification path and tensile properties of high Nb-TiAl alloys alloyed with β stable elements Cr or/and Mn were studied in this work. The results showed that volume fraction of B2 phase gradually increased while α2 phase gradually decreased in as-cast microstructures of Ti-45Al-8Nb-0.4B (atom fraction, %, similarly hereinafter) alloyed by 2Cr, 2Mn and 1Cr1Mn. 1Cr1Mn alloy turned into the novel β-γ high Nb-TiAl alloy, which was composed of γ and B2 two phases rather than γ, α2 and B2 three phases. The solidification path changed from L→β→β+α→α+γ+β→α2+γ+B2 to L→β→β+γ→B2+γ. The co-addition of Cr and Mn had more obvious β stable ability. The room temperature tensile results showed that with the increase of B2 phase, the strength and elongation both decreased. While the elongation decreased firstly and increased subsequently at 900℃. This phenomenon showed that when the β phase content reach a certain level, which was 14.4 % in this study, β phase was advantageous to deformation at high temperature.
作者单位E-mail
杨亮 北京科技大学新金属材料国家重点实验室 yangliang850223@163.com 
辛景景 北京科技大学新金属材料国家重点实验室  
张有为 沈阳铸造研究所  
包春玲 沈阳铸造研究所  
张来启 北京科技大学新金属材料国家重点实验室  
林均品 北京科技大学新金属材料国家重点实验室 Email: linjunpin@ustb.edu.cn 
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