MODELING OF CRACK TIP DISLOCATION EMISSION IN B2 INTERMETALLIC ALLOYS

被引：4

作者：

BARTHOLOMEUSZ, MF

WERT, JA

机构：

[1] Department of Materials Science, University of Virginia, Charlottesville

来源：

JOURNAL OF MATERIALS RESEARCH | 1992年 / 7卷 / 04期

关键词：

D O I：

10.1557/JMR.1992.0919

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A model has been previously proposed to describe the energy associated with emission of dissociated superlattice dislocations from crack tips in ordered intermetallic alloys. In the present paper, the model is applied to several B2 intermetallic alloys. The results of the analysis reveal a correlation between the range of slip system orientations for which emission of a dislocation from a crack tip is energetically favorable and the macroscopic fracture mode of the alloy. Additionally, the effects of changing the active slip system, increasing the thermal energy available for thermally activated dislocation emission, and changing the {111} APB energy on the fracture mode of NiAl and FeAl are discussed.

引用

页码：919 / 925

页数：7

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