Microstructure-strength models for heat treatment of Al-Si-Mg casting alloys I: microstructure evolution and precipitation kinetics

被引：18

作者：

Colley, L. J. ^{[1
]}

Wells, M. A. ^{[2
]}

Poole, W. J. ^{[3
]}

机构：

[1] Dana Canada Corp, Oakville, ON L4K 3E4, Canada

[2] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada

[3] Univ British Columbia, Dept Mat Engn, Vancouver, BC V6T 1Z4, Canada

来源：

CANADIAN METALLURGICAL QUARTERLY | 2014年 / 53卷 / 02期

关键词：

A356; Homogenization; Silicon fragmentation; Mathematical model; Solution treatment; Calorimetry; Al-Si-Mg casting alloys; Eutectic morpholgy; DISSOLUTION; GROWTH; PHASE; NUCLEATION;

D O I：

10.1179/1879139513Y.0000000112

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A comprehensive microstructure-strength mathematical model for the heat treatment of Al-Si-Mg casting alloys is presented. As part of the model development, the evolution of microstructure and mechanical properties during heat treatment of an industrially cast A356 aluminium alloy was studied in an extensive experimental investigation. For the solution treatment process, the changes in dendritic composition and eutectic morphology in the temperature range 773-833 K (500-560 degrees C) were quantified using microprobe and image analysis techniques. For natural and artificial ageing, the kinetics of precipitation/clustering was determined using an isothermal calorimetry technique in conjunction with hardness and mechanical property measurements. Two other Al-Si-Mg model alloy compositions were used to study the effects of alloy chemistry on microstructure response during heat treatment. The overall aim of the experimental work presented here is to facilitate the development of a comprehensive microstructure-strength model for the heat treatment of Al-Si-Mg casting alloys that will be presented in part II of this paper.

引用

页码：125 / 137

页数：13

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