A HIGH-TOUGHNESS GAMMA-TITANIUM ALUMINIDE

被引：81

作者：

DEVE, HE

EVANS, AG

SHIH, DS

机构：

[1] UNIV CALIF SANTA BARBARA, COLL ENGN, DEPT MAT, SANTA BARBARA, CA 93106 USA

[2] MCDONNELL DOUGLAS CORP, MCDONNELL DOUGLAS RES LABS, ST LOUIS, MO 63166 USA

来源：

ACTA METALLURGICA ET MATERIALIA | 1992年 / 40卷 / 06期

关键词：

D O I：

10.1016/0956-7151(92)90425-E

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A high-toughness gamma-TiAl with a lath microstructure has been characterized. The presence of a laminated structure that consists of alpha-2 plates between gamma-laths has been shown to govern the toughness. The lath microstructure promotes dissipation through a combination of process zone and crack bridging mechanisms. Mechanical twinning in the gamma-phase contributes to the toughness through the formation of a twin process zone, while regions consisting of intact lath colonies act as bridging ligaments in the crack wake. The measured steady-state toughness of approximately 25 MPa square-root m is consistent with preliminary estimates of dissipation: which indicate that similar contributions arise from deformation within the bridging ligaments and from twinning in the process zone.

引用

页码：1259 / 1265

页数：7

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