A model for coherency strengthening of large precipitates

被引：21

作者：

Ahmadi, M. R. ^{[1
,2
,3
]}

Povoden-Karadeniz, E. ^{[1
]}

Sonderegger, B. ^{[4
]}

Oeksuez, K. I. ^{[3
]}

Falahati, A. ^{[3
]}

Kozeschnik, E. ^{[1
,2
,3
]}

机构：

[1] Vienna Univ Technol, Christian Doppler Lab Early Stages Precipitat, Inst Mat Sci & Technol, A-1040 Vienna, Austria

[2] Univ Leoben, Dept Phys Met & Mat Testing, Christian Doppler Lab Early Stages Precipitat, A-8700 Leoben, Austria

[3] Vienna Univ Technol, Inst Mat Sci & Technol, A-1040 Vienna, Austria

[4] Univ Cape Town, Dept Mech Engn, Ctr Mat Engn, ZA-7925 Cape Town, South Africa

来源：

SCRIPTA MATERIALIA | 2014年 / 84-85卷

关键词：

Coherency strengthening; Large precipitate; Shear stress; QUANTIFICATION; STRESS;

D O I：

10.1016/j.scriptamat.2014.04.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In precipitation strengthening, the lattice misfit between precipitate and matrix produces a strain field around precipitates, which impedes dislocation movement. In this paper, a strengthening model is presented, which delivers the stress increment associated with the strain field around large homogeneous spherical precipitates. In contrast to previous work, this study takes into account that the effective resistance force on the dislocation depends strongly on the relative position of the slip plane to the precipitate center. On ignoring this effect, the maximum shear stress due to the strong and shearing mechanism is generally underestimated. The results are presented in the form of discrete equations based on the evaluation of the resistance force in front of a moving edge or screw dislocation and, alternatively, with a correction factor for conventional strong and shearing equations. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：47 / 50

页数：4

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