AN ATOMISTIC STUDY OF THE DISLOCATION CORE STRUCTURES AND MECHANICAL-BEHAVIOR OF A MODEL DO19 ALLOY

被引：28

作者：

CSERTI, J

KHANTHA, M

VITEK, V

POPE, DP

机构：

[1] Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1992年 / 152卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0921-5093(92)90052-3

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

As in many other intermetallics, the principal features of the plastic behavior of hexagonal D0(19) compounds appear to be controlled by the structure of dislocation cores. In the present paper we investigate the possible core configurations of the [1210BAR] screw dislocations on basal and prism planes in a model D0(19) structure. First an N-body potential describing atomic interactions in a mechanically and structurally stable model D0(19) lattice is presented. This potential is then used to investigate the stability of planar faults on basal and prismatic planes and to calculate the core structures of the 1/3[1210BAR] screw superpartials bounding antiphase boundaries on these planes. The possible microscopic origins of the basic characteristics of the plastic deformation of Ti3Al and Mn3Sn are then discussed in the light of these results.

引用

页码：95 / 102

页数：8

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