Absence of Threshold Stress for High-Temperature Creep of Dispersion- and Solution-Hardened Al-3.1 at% Mg-1.3 vol% be Alloy

Ying Hwa Yeh, Masakazu Miyachi, Masakazu Miyachi, Hideharu Nakashima, Hideo Yoshinaga, Hiroaki Kurishita, Shoji Goto, Shoji Goto, Shoji Goto

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Abstract

In order to examine the Srolovitz's theory of attractive interaction between dislocations and dispersed particles, an Al-3.1 at% Mg-1.3 vol% Be alloy having a combined effect of dispersion- and solution-hardenings was subjected to creep tests and transmission electron microscopic observation. The creep test was conducted at temperatures from 623 to 723 K and at stresses from 1.8 to 51.4 MPa which correspond to the range of 0.34-7.64σvv is the void hardening stress). The results show that the dislocation-particle interaction is attractive, but no clear threshold stress is observed under the conditions tested. This suggests that the absence of threshold stress should have no bearing on the climb mechanism. The reason for the absence of threshold stress in this alloy is discussed from viewpoints of solution hardening and grain boundary sliding.

Original languageEnglish
Pages (from-to)778-785
Number of pages8
JournalMaterials Transactions, JIM
Volume31
Issue number9
DOIs
Publication statusPublished - Jan 1 1990

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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