THE DIRECT OBSERVATION OF COOPERATIVE GRAIN-BOUNDARY SLIDING AND MIGRATION DURING SUPERPLASTIC DEFORMATION OF LEAD-TIN EUTECTIC IN SHEAR

被引：43

作者：

ZELIN, MG

DUNLAP, MR

ROSEN, R

MUKHERJEE, AK

机构：

[1] UNIV CALIF DAVIS,FACIL ADV INSTRUMENTAT,DAVIS,CA 95616

[2] TECHNION ISRAEL INST TECHNOL,DEPT MAT ENGN,HAIFA,ISRAEL

来源：

JOURNAL OF APPLIED PHYSICS | 1993年 / 74卷 / 08期

关键词：

D O I：

10.1063/1.354302

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Direct observation of superplastic deformation in shear in a scanning electron microscope in Pb-62% Sn eutectic alloy at different microstructural levels were performed. The sliding of grains as an entity was observed. Such cooperative grain-boundary sliding proceeds by means of the sequential shear of grains along shear surfaces, and is accompanied by cooperative grain-boundary migration. The pattern of shear surfaces at the level of the entire deformed volume is close to one that is predicted by slip-lines field theory. The processes to accommodate deformation of grain-boundary sliding include the operation of grain-boundary migration, intragranular deformation, and grain rotation. A critical analysis of the proposed geometrical models for superplastic flow is given. The model of sequential shear of grains as a result of the movement of cellular dislocations is extended to the case of the two-phase material, having structure that is typical for superplastic eutectics.

引用

页码：4972 / 4982

页数：11

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