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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(英文),2017,46(10):3005~3010.[Yang liang,Xin Jingjing,Zhang Youwei,Bao Chunling,Zhang Laiqi and 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.]
Microstructure Evolution and Tensile Properties of β-γ TiAl Alloy Containing High Content of Nb
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Received:July 18, 2015  Revised:September 22, 2015
DOI:
Key words: β solidification  β-γ high Nb-TiAl alloy  microstructure evolution  tensile properties  Cr and Mn
Foundation item: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)
Author NameAffiliation
Yang liang,Xin Jingjing,Zhang Youwei,Bao Chunling,Zhang Laiqi and Lin Junpin  
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Abstract:
      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.
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