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OALib Journal期刊
ISSN: 2333-9721
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间隙原子O对高Nb－TiAl合金显微组织与相转变的影响
DOI: 10.3724/SP.J.1037.2013.00401, PP. 1381-1386
Keywords: 高Nb－TiAl合金,间隙原子O,凝固行为,相转变
Abstract:
采用真空非自耗电弧炉制备了不同含O量的Ti－46Al－8Nb－xO(原子分数)合金铸锭,研究间隙原子O对高Nb－TiAl合金凝固组织及相转变的影响规律和作用机制.结果表明,随着O含量的增加,Ti－46Al－8Nb－xO铸锭中α2相含量逐渐增加.O的加入明显细化合金组织,并且使得组织由双态组织向全片层组织转变.间隙原子O的添加使得Ti－46Al－8Nb合金由β相领先的凝固方式转化为以α相领先的凝固方式,同时使包晶反应α+L→γ向低Al区移动,共析反应α→α2+β向高Al区移动,扩大了α相区的范围.通过DSC分析表明,O原子可以明显提高合金的共析反应温度,但随着含量的增加作用效果逐渐减弱.
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