Effect of lamellar plates on creep resistance in near gamma TiAl alloys

被引：24

作者：

Matsuo, T ^{[1
]}

Nozaki, T ^{[1
]}

Asai, T ^{[1
]}

Chang, SY ^{[1
]}

Takeyama, M ^{[1
]}

机构：

[1] Tokyo Inst Technol, Dept Met Engn, Meguro Ku, Tokyo 1528552, Japan

来源：

INTERMETALLICS | 1998年 / 6卷 / 7-8期

关键词：

titanium aluminides; based on TiAl; creep; recrystallization; microstructure;

D O I：

10.1016/S0966-9795(98)00046-6

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：

Effect of interlamellar spacings on creep rate in Ti-48 at% Al alloy with fully transformed lamellar structure (FL) has been investigated at 1123 K/98 MPa. In addition, the correlation between creep rate and lamellar orientation to stress axis was elucidated by conducting creep tests at 1148 K/68.6 MPa for three single crystal (SC) specimens of Ti-48 at% Al with different lamellar orientations to stress axis. The difference in creep rate among FL specimens having different interlamellar spacings could not be defined in the early stage of transient creep. The onset of accelerating creep was slightly retarded by decreasing the interlamellar spacing. While the creep rate of the SC specimen whose lamellar orientation to stress axis 30-63 degrees gradually decreases with increasing strain, and is larger than that of the FL specimen, the creep rate of the SC specimen with lamellar orientation nearly parallel to stress axis drastically decreases within small strain, and is 1/50 smaller than that of the FL specimen. This strong lamellar orientation dependence of creep rate is interpreted by the correlation between dislocation slip system and the lamellar plate. (C) 1998 Elsevier Science Limited. All rights reserved.

引用

页码：695 / 698

页数：4

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