DEFORMATION AND FRACTURE OF L12 TRIALUMINIDES

被引：78

作者：

GEORGE, EP ^{[1
]}

POPE, DP ^{[1
]}

FU, CL ^{[1
]}

SCHNEIBEL, JH ^{[1
]}

机构：

[1] UNIV PENN,DEPT MAT SCI & ENGN,PHILADELPHIA,PA 19104

来源：

ISIJ INTERNATIONAL | 1991年 / 31卷 / 10期

关键词：

L12; TRIALUMINIDES; AL3TI-BASE AND AL3ZR-BASE ALLOYS; AL3SC; MECHANICAL PROPERTIES AND FRACTURE BEHAVIOR; DISLOCATION STRUCTURES; 1ST-PRINCIPLES CALCULATIONS; IDEAL CLEAVAGE STRENGTHS AND SURFACE ENERGIES;

D O I：

10.2355/isijinternational.31.1063

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

We review here recent experimental and theoretical work aimed at characterizing and understanding the deformation and fracture behavior of L1(2) traluminides, with emphasis mainly on Al3Ti-base alloys. We also review recent work on the binary compound Al3Sc, which is a model L1(2) trialuminide that is being studied for comparison with first-prnciples quantum mechanical calculations. The topics covered in this review include: alloy-element effects and phase stability; dislocation structures; mechanical properties; cleavage fracture behavior; and first-principles calculations of elastic constants, fault energies, and ideal cleavage strengths. We discuss various possible reasons for the brittleness of these alloys, and summarize our current understanding of the rather unusual phenomenon of brittle cleavage in relatively soft materials having the high-symmetry L1(2) structure.

引用

页码：1063 / 1075

页数：13

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