A tuning nano-precipitation approach for achieving enhanced strength and good ductility in Al alloys

被引：51

作者：

Liu, C. H. ^{[1
]}

Li, X. L. ^{[1
]}

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

Chen, J. H. ^{[1
]}

Teng, Q. ^{[1
]}

Chen, J. ^{[1
]}

Gu, Y. ^{[1
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

来源：

MATERIALS & DESIGN | 2014年 / 54卷

基金：

中国国家自然科学基金;

关键词：

Strength; Precipitation; Nano-particle; Aging; Aluminum alloys; MG-SI ALLOYS; SEVERE PLASTIC-DEFORMATION; 3-DIMENSIONAL ATOM-PROBE; MECHANICAL-PROPERTIES; ALMGSI ALLOYS; MICROSTRUCTURES;

D O I：

10.1016/j.matdes.2013.08.042

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A new strategy through controlling the aggregation states of alloying elements before cold-rolling is proposed to tune the nano-precipitation in Al alloys processed by combining deformation and aging. A considerable improvement in strength and good ductility is achieved in Al-Mg-Si-Cu alloy by our approach, which is applicable to many precipitation-hardened alloy systems and suitable for industrial application. A bi-modal distribution of precipitates, discrete lath-like Q ''-type precipitate and continuous precipitate with the composition identical to Q'-type phase, occur in the annealed sample pre-treated by natural aging. A short-term artificial aging which induces a dispersion of nano-sized coherent particles, mainly GP zone of the monoclinic beta ''-type phase, before cold-rolling can lead to the formation of finely and homogeneously distributed Q ''-type precipitates, which are in favor of an enhancement in strengthening potential for the final aging. Our finding suggests that the solutes aggregation state before deformation affects significantly the re-precipitation of solutes during the subsequent annealing. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：144 / 148

页数：5

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