Stability of metastable phases and microstructures in the ageing process of Al–Mg–Si ternary alloys

被引：4

作者：

M Takeda

F Ohkubo

T Shirai

K Fukui

机构：

[1] Yokohama National University,Department of Mechanical Engineering and Materials Science

[2] Showa Aluminium Co.,Research Centre, Oyama Factory

来源：

Journal of Materials Science | 1998年 / 33卷

关键词：

Transmission Electron Microscopy; Differential Scanning Calorimetry; Exothermic Peak; Differential Scanning Calorimetry Curve; Vickers Hardness;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Precipitation behaviour of Al–Mg–Si alloys, with balanced (Mg/Si=2), excess silicon (Mg/Si<2) and excess magnesium (Mg/Si>2) compositions, were studied by differential scanning calorimetry (DSC), transmission electron microscopy (TEM), and Vickers hardness tests. Four significant exothermic peaks were observed in DSC curves which were attributed to metastable clusters, β″, β′ and stable β phases. The peaks corresponding to β″ and β′ were formed closely in the DSC curves but showed different behaviour in isothermal annealing. The additional peak verifying the precipitation of phases, which has recently been proposed by some workers, was not detected. Transmission electron microscope observations and Vickers microhardness tests showed that β″ precipitates played a major role in improving the hardness, but not β′ precipitates. © 1998 Chapman & Hall

引用

页码：2385 / 2390

页数：5