The thermodynamics of and strengthening due to co-clusters: General theory and application to the case of Al-Cu-Mg alloys

被引：164
作者：
Starink, M. J. [1 ]
Wang, S. C. [1 ]
机构：
[1] Univ Southampton, Sch Engn Sci, Mat Res Grp, Southampton SO17 1BJ, Hants, England
来源：
ACTA MATERIALIA | 2009年 / 57卷 / 08期
关键词：
Ageing; Nanostructure; Modelling; Thermodynamics; Short range ordering; ROOM-TEMPERATURE PRECIPITATION; ALUMINUM-LITHIUM-ALLOYS; REACTION-KINETICS; SMALL ADDITIONS; MN ALLOYS; GPB ZONES; MICROSTRUCTURE; MODEL; BEHAVIOR; EVOLUTION;
D O I：
10.1016/j.actamat.2009.01.021
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Co-clusters in tertiary or higher order metallic alloys are metastable structures involving two or more distinct alloying atoms that retain the structure of the host lattice. A thermodynamic model based on a single interaction energy of dissimilar nearest neighbour interaction energy is presented. and a model for the strengthening due to these co-cluster dimers is derived. The model includes a new treatment of (short-range) order strengthening relevant to these co-clusters and further encompasses modulus hardening and chemical hardening. The models are tested against data on a wide ran-e of Al-Cu-Mg alloys treated at temperatures between 20 and 220 degrees C. Both quantitative calorimetry data on the enthalpy change due to co-cluster formation and strengthening due to co-clusters is predicted well. It is shown that in general (short-range) order strengthening will be the main strengthening mechanism. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码：2376 / 2389
页数：14
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