A NEW MODEL-BASED CREEP EQUATION FOR DISPERSION STRENGTHENED MATERIALS

被引：430

作者：

ROSLER, J ^{[1
]}

ARZT, E ^{[1
]}

机构：

[1] MAX PLANCK INST MET RES, W-7000 STUTTGART 80, GERMANY

来源：

ACTA METALLURGICA ET MATERIALIA | 1990年 / 38卷 / 04期

关键词：

D O I：

10.1016/0956-7151(90)90223-4

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The strongly stress-sensitive and temperature-dependent creep behaviour of dispersion strengthened materials cannot be described satisfactorily by current creep laws. In this paper a new creep equation is developed which considers as the rate-controlling event the thermally activated detachment of dislocations from dispersoid particles exerting an attractive force. The approach is motivated by recent TEM observations and theoretical calculations which strongly suggest that the "classical" view, according to which particles merely force dislocations to climb around them, is inadequate. The creep equation is applied to a dispersion-strengthened superalloy, two aluminium alloys and bubble-strengthened tungsten. Practical conclusions, regarding the optimum dispersoid size and alloy development, are drawn. © 1990.

引用

页码：671 / 683

页数：13

共 51 条

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