Hierarchical structure in Al-Cu alloys to promote strength/ductility synergy

被引：29

作者：

Wu, S. H. ^{[1
,2
]}

Xue, H. ^{[2
]}

Yang, C. ^{[2
]}

Kuang, J. ^{[2
]}

Zhang, P. ^{[2
]}

Zhang, J. Y. ^{[2
]}

Li, Y. J. ^{[1
]}

Roven, Hans J. ^{[1
]}

Liu, G. ^{[2
]}

Sun, J. ^{[2
]}

机构：

[1] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, N-7491 Trondheim, Norway

[2] Xi An Jiao Tong Univ, State Key Lab Mech Behav Mat, Xian 710049, Peoples R China

来源：

SCRIPTA MATERIALIA | 2021年 / 202卷

基金：

中国国家自然科学基金;

关键词：

Al-Cu alloy; Ultrafine-grained; Microalloying effect; Mechanical properties; Hierarchical microstructure; GRAIN-BOUNDARY SEGREGATION; SEVERE PLASTIC-DEFORMATION; MICROSTRUCTURAL EVOLUTION; STRENGTHENING MECHANISMS; HALL-PETCH; PRECIPITATION; DUCTILITY; REFINEMENT; BEHAVIOR; METALS;

D O I：

10.1016/j.scriptamat.2021.113996

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Experimental evidence demonstrated that equal channel angular pressing (ECAP) at cryogenic temperature, in comparison with ECAP at room temperature, led to promoted strength-ductility synergy in an Al-2.5wt.%Cu alloy. The simultaneous improvement is related to microstructural hierarchy of multimodal grains, low angle grain boundaries, and inter/intragranular precipitates, which was tuned by aging treatment in match with the low-temperature ECAP. The artificial aging could maintain multimodal grain size distribution, introduce a large number of low angle grain boundaries and produce intragranular precipitates to improve strength/ductility. A minor 0.3wt.% Sc addition was effective in optimizing the precipitations and further boosting the strength/ductility combination. The underlying mechanisms for higher strength and greater ductility were rationalized in terms of the low-temperature ECAP.(c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：6

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