AN INVESTIGATION OF THE FRACTURE-BEHAVIOR OF GAMMA-BASED TITANIUM ALUMINIDES - EFFECTS OF ANNEALING IN THE ALPHA+GAMMA AND ALPHA-2+GAMMA PHASE FIELDS

被引：45

作者：

SOBOYEJO, WO

SCHWARTZ, DS

SASTRY, SML

机构：

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

[2] WASHINGTON UNIV,DEPT MECH ENGN,ST LOUIS,MO 63130

来源：

METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 1992年 / 23卷 / 07期

关键词：

D O I：

10.1007/BF02647551

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effects of annealing in the alpha + gamma and alpha-2 + gamma-phase fields on the microstructures and fracture properties of Ti-48Al and Ti-49Al-3.4Nb are discussed in this article. Annealing of the niobium-containing alloy in the alpha-2 + gamma-phase field results in the precipitation of alpha-2 and Nb5Si3 predominantly at the grain boundaries. The precipitation decrease the grain boundary cohesion, thereby promoting intergranular separation. Precipitation also decreases the tensile strength and ductility of Ti-49Al-3.4Nb compared to that of the binary alloy. The possible role of interfaces in the transmission of slip is also discussed, and micromechanical models are applied to the prediction of tensile behavior and fracture toughness.

引用

页码：2039 / 2059

页数：21

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