Effect of precipitate morphology evolution on the strength-toughness relationship in Al-Mg-Si alloys

被引：32

作者：

Yuan, S. P. ^{[1
]}

Liu, G. ^{[1
]}

Wang, R. H. ^{[1
]}

Zhang, G-J ^{[1
]}

Pu, X. ^{[1
]}

Sun, J. ^{[1
]}

Chen, K. -H. ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Mat Sci & Engn, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

[2] Univ So Cent China, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

来源：

SCRIPTA MATERIALIA | 2009年 / 60卷 / 12期

关键词：

Aluminum alloys; Fracture toughness; Precipitate; Morphology evolution; TREATABLE ALUMINUM-ALLOYS; AFFECTING FRACTURE TOUGHNESS; DUCTILE FRACTURE; 2ND-PHASE PARTICLES; YIELD STRENGTH;

D O I：

10.1016/j.scriptamat.2009.02.047

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Experimental results show that the gradual evolution of precipitate morphology in Al-Mg-Si alloys, from spherical to rod-/needle-shaped, leads to an increase in ductility but a decrease in both yield strength and fracture toughness. The strength-ductility relationship reported here is similar to general observations but the strength-toughness relationship is distinctly different from the conventional one. These relationships are rationalized by considering a competition between dislocation-precipitate interaction and precipitate-matrix deformation discrepancy as the dominant strain localization mechanism, which is modulated by the evolution of precipitate morphology. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：1109 / 1112

页数：4

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