Microstructural evolution of (TiAl)+Nb+W+B alloy

来源期刊:中国有色金属学报(英文版)2011年第10期

论文作者:黄岚 P. K. LIAW C. T. LIU 刘咏 黄劲松

文章页码:2192 - 2198

关键词:TiAl金属间化合物;W;B;拉伸延性;组织演变;大锭

Key words:TiAl intermetallics; W; B; tensile ductility; microstructural evolution; large ingot

摘    要:通过磁悬浮法制备含有W、Nb、B的重15 kg TiAl合金大锭。此合金大锭与电弧熔炼的0.05 kg的小样品相比,存在晶粒大小和相组织结构性质方面的区别。设计了一系列热处理工艺来消除大锭合金的高温残留β相,并获取理想的微观组织。铸态大锭合金在经过适当的热处理工艺后室温伸长率可达1.9%。这种大批量方式生产的TiAl合金,通过新合金设计与相应的热处理后,其力学性能可获得显著提高。

Abstract:

A newly designed TiAl alloy containing W, Nb, and B was produced through magnetic-flotation-melting method. Mass production of this TiAl-based alloy, 15 kg ingot size, which is quite different from the 0.05 kg small ingot produced by arc-melting, has a large effect on the metallurgical properties, such as the grain size and the phase structures of the alloy. Heat treatments were carefully designed in order to reduce the amount of the high-temperature remaining β phase in the alloy, and to obtain optimal microstructures for mechanical behavior studies. A room-temperature ductility of 1.9% was obtained in the cast TiAl-based alloy after the appropriate heat treatment. The mechanical behavior of the large ingot through mass production of the TiAl-based alloy was largely improved by the alloy design and subsequent heat treatments.

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