Nano-scale clusters formed in the early stage of phase decomposition of Al-Mg-Si alloys

被引：11
作者：
Hirosawa, S [1 ]
Sato, T [1 ]
机构：
[1] Tokyo Inst Technol, Dept Met & Ceram Sci, Meguro Ku, Tokyo 1528552, Japan
来源：
PRICM 5: THE FIFTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, PTS 1-5 | 2005年 / 475-479卷
关键词：
Al-Mg-Si alloys; nanoclusters; phase decomposition; two-step aging; precipitation hardening; DSC; atom probe analysis;
D O I：
10.4028/www.scientific.net/MSF.475-479.357
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The formation of nano-scale clusters (nanoclusters) prior to the precipitation of the strengthening beta" phase significantly influences two-step aging behavior of Al-Mg-Si alloys. In this work, the existence of two kinds of nanoclusters has been verified in the early stage of phase decomposition by differential scanning calorimetry (DSC) and three-dimensional atom probe (3DAP). Pre-aging treatment at 373K before natural aging was also found to form preferentially one of the two nanoclusters, resulting in the remarkable restoration of age-hardenability at paint-bake temperatures. Such microstructural control by means of optimized heat-treatments; i.e. nanocluster assist processing (NCAP), possesses great potential for enabling Al-Mg-Si alloys to be used more widely as a body-sheet material of automobiles.
引用
收藏
页码：357 / 360
页数：4
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