A UNIFIED APPROACH TO GRAIN-BOUNDARY SLIDING IN CREEP AND SUPERPLASTICITY

被引:509
作者
LANGDON, TG [1 ]
机构
[1] UNIV SO CALIF, DEPT MECH ENGN, LOS ANGELES, CA 90089 USA
来源
ACTA METALLURGICA ET MATERIALIA | 1994年 / 42卷 / 07期
关键词
D O I
10.1016/0956-7151(94)90322-0
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Rachinger grain boundary sliding is a characteristic of high temperature deformation in both creep when the grain size is large (d > lambda) and superplasticity when the grain size is small (d < lambda), where d and lambda are the grain size and the subgrain size, respectively. An analytical procedure is used to determine the rate equation for Rachinger sliding when d > lambda. Data for superplastic metals are examined to give the rate equation for Rachinger sliding when d < lambda. A unified model is developed for Rachinger sliding at all grain sizes, where the rate of sliding is controlled by the rate of accommodation through intragranular slip. It is demonstrated that the predictions of this model are in good agreement with experimental data under both creep and superplastic conditions.
引用
收藏
页码:2437 / 2443
页数:7
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