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

(TiAl)+Nb+W+B合金的微观组织演变(英文)

作　　者：黄岚 P.K.LIAW C.T.LIU 刘咏[3] 黄劲松[3] 

机构地区：[1]Department of Materials Science and Engineering,The University of Tennessee [2]香港城市大学机械与生物医学工程系 [3]中南大学粉末冶金研究院,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第10期2192-2198,共7页中国有色金属学报（英文版）

基　　金：Project(11X-SP173V) supported by the U.S. Fossil Energy Materials Program;Project supported by the U.S. National Science Foundation Combined Research-Curriculum Development(CRCD) Program;Project(DE-AC05-00OR-22725 UT-Battelle,LLC) supported by Division of Materials Science and Engineering,Office of Basic Energy Science,U.S.Department of Energy

摘　　要：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.通过磁悬浮法制备含有W、Nb、B的重15kgTiAl合金大锭。此合金大锭与电弧熔炼的0.05kg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。

关 键 词：TiAl intermetallics W B tensile ductility microstructural evolution large ingot 

分 类 号：TG146.2[一般工业技术—材料科学与工程]