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ADVANCE IN Ti_3 Al AND TiAl INTERMETALLICS RESEARCH IN CISRI

ZHONG Zengyong , ZO U Dunxu , LI Shiqiong (Central Iron and Steel Research Institute , Beijing 100081 . China)

金属学报(英文版)

Recent work on Ti_3Al base alloy,TAC-1, developed in CISRI, including investigations of effects of modification in alloying and TMP on microstructural characteristics and mechanical behaviour,indicates that alloy TAC -1 is very promising structural material for a number of elevated temperature applications. Stuody dealing with a reverse relation between RT ductility and toughness found on TiA base alloy, TAC-2, led to development of a special heat treatment technique for producing a fine filly lamellar microstructure (FFL), which gives a high and balancing ductility and toughness. This is also of significance for promoting engineering applications of this alloy.

关键词: : Ti_3Al , null , null

Ti_3Al金属间化合物氢致解理断裂及其机理

张跃 , 褚武扬 , 袁润章 , 王燕斌 , 欧阳世翕 , 肖纪美

金属学报

Ti-24Al-11Nb合金在室温下恒载荷动态充氢以及交变载荷动态充氢时,氢通过促进裂纹在滑移面上的解理,促进了裂纹扩展。不连续的氢致解理裂纹优先在α_2相形核,α_2/β相界面是裂纹扩展的有效障碍。氢通过促进裂尖位错的发射、解理微裂纹在无位错区(DFZ)的形核以及解理裂纹的扩展,导致氢致解理断裂

关键词: Ti_3Al , intermetallic compound , hydrogen induced crack , mechanism

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