SUPERPLASTIC BEHAVIOR OF 2-PHASE TITANIUM ALUMINIDES

被引：87

作者：

CHENG, SC ^{[1
]}

WOLFENSTINE, J ^{[1
]}

SHERBY, OD ^{[1
]}

机构：

[1] UNIV CALIF IRVINE, DEPT MAT SCI & ENGN, IRVINE, CA 92717 USA

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1992年 / 23卷 / 05期

关键词：

D O I：

10.1007/BF02647333

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A two-phase Ti(57 at. pct)-Al(43 at. pct) alloy with an initial lamellar microstructure was thermomechanically processed to form an equiaxed fine-grained structure. The fine-grained (LBAR = 5-mu-m) material was superplastic in the temperature range 1000-degrees-C to 1100-degrees-C, exhibiting a stress exponent of about 2 with a tensile ductility of 275 pct. The rate-controlling deformation mechanism is proposed to be grain boundary sliding accommodated by slip controlled by lattice diffusion in TiAl. At room temperature, the lamellar and fine-grained materials exhibit the same compressive yield stress. The compressive strain to failure, however, for the fine-grained material was about 28 pct compared to 6 pct for the lamellar material.

引用

页码：1509 / 1513

页数：5

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