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β-γ高Nb-TiAl合金組織轉(zhuǎn)變及拉伸性能研究
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北京科技大學新金屬材料國家重點實驗室,北京科技大學新金屬材料國家重點實驗室,沈陽鑄造研究所,沈陽鑄造研究所,北京科技大學新金屬材料國家重點實驗室,北京科技大學新金屬材料國家重點實驗室

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國家重點基礎(chǔ)研究發(fā)展規(guī)劃資助(項目號2011CB605501)； 國家自然科學基金資助(項目號51271016)


Microstructure Evolution and Tensile Properties of β-γ TiAl Alloy Containing High Content of Nb
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State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Shenyang Research Institute of Foundry,Shenyang Research Institute of Foundry,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing

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    摘要:

    本文研究了β穩(wěn)定元素Cr和Mn的摻雜對高Nb-TiAl合金的組織、相組成、凝固路徑及室溫、高溫拉伸性能的影響。實驗結(jié)果表明，Ti-45Al-8Nb-0.4B（原子分數(shù)，%，下同）合金中分別加入2Cr、2Mn或1Cr1Mn后，鑄態(tài)組織中B2相逐步增加，而α2相逐步減小。1Cr1Mn合金轉(zhuǎn)變?yōu)橛搔?B2兩相組成的新型β-γ高Nb-TiAl合金。凝固路徑由L→β→β+α→α+γ+β→α2+γ+B2轉(zhuǎn)變?yōu)長→β→β+γ→B2+γ。Cr和Mn的同時添加具有更明顯的β相穩(wěn)定作用。室溫拉伸結(jié)果表明，隨著B2相含量的增加，合金的強度與延伸率均降低。而在900℃條件下，合金延伸率出現(xiàn)先降低后升高的現(xiàn)象。這說明，高溫下合金中β相含量達到一定程度時（本研究為14.4 %），有利于協(xié)調(diào)變形。

    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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楊亮,辛景景,張有為,包春玲,張來啟,林均品.β-γ高Nb-TiAl合金組織轉(zhuǎn)變及拉伸性能研究[J].稀有金屬材料與工程,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.]
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  • 收稿日期:2015-07-18
  • 最后修改日期:2015-09-22
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2017-12-01
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