Diffusion creep of intermetallic TiAl alloys

被引：17
|
作者：
Gorzel, A [1 ]
Sauthoff, G [1 ]
机构：
[1] Max Planck Inst Eisenforsch GmbH, D-40074 Dusseldorf, Germany
来源：
INTERMETALLICS | 1999年 / 7卷 / 3-4期
关键词：
titanium aluminides; based on TiAl; multiphase intermetallics; creep (properties and mechanisms); diffusion;
D O I：
10.1016/S0966-9795(98)00099-5
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The creep behaviour of gamma-TiAl with L1(0) structure without second phases, gamma-TiAl with precipitated particles of alpha(2)-Ti3Al With D0(19) structure, and gamma-TiAl with the H-phase Ti2AlC has been studied at low stresses in the temperature range 900-1200 degrees C. The obtained data allow the construction of creep deformation mechanism maps for the studied alloys which may be used for an extrapolation of the observed creep behaviour. At higher stresses dislocation creep occurs in all alloys, which is well described by the Dorn equation with stress exponents in the range 3-5. Extended Coble creep with threshold stress was observed only for the studied two-phase alloys. A strong temperature dependence of the threshold stress for Coble creep was found for the TiAl alloy with carbide particles. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：371 / 380
页数：10
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