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
相关论文
共 10 条
[1]   Analysis conditions of an industrial Al-Mg-Si alloy by conventional and 3D atom probes [J].
Danoix, F ;
Miller, MK ;
Bigot, A .
ULTRAMICROSCOPY, 2001, 89 (1-3) :177-188
[2]   The precipitation sequence in Al-Mg-Si alloys [J].
Edwards, GA ;
Stiller, K ;
Dunlop, GL ;
Couper, MJ .
ACTA MATERIALIA, 1998, 46 (11) :3893-3904
[3]   Atom probe studies on the early stages of precipitation in Al-Mg-Si alloys [J].
Murayama, M ;
Hono, K ;
Saga, M ;
Kikuchi, M .
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1998, 250 (01) :127-132
[4]   Pre-precipitate clusters and precipitation processes in Al-Mg-Si alloys [J].
Murayama, M ;
Hono, K .
ACTA MATERIALIA, 1999, 47 (05) :1537-1548
[5]   Roles of microalloying elements on the cluster formation in the initial stage of phase decomposition of Al-based alloys [J].
Sato, T ;
Hirosawa, S ;
Hirose, K ;
Maeguchi, T .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2003, 34A (12) :2745-2755
[6]   Precipitation behaviour of Al-Mg-Si ternary alloys [J].
Takeda, M ;
Ohkubo, F ;
Shirai, T ;
Fukui, K .
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 1996, 217 :815-820
[7]   Stability of metastable phases and microstructures in the ageing process of Al-Mg-Si ternary alloys [J].
Takeda, M ;
Ohkubo, F ;
Shirai, T ;
Fukui, K .
JOURNAL OF MATERIALS SCIENCE, 1998, 33 (09) :2385-2390
[8]   A procedure for quantification of precipitate microstructures from three-dimensional atom probe data [J].
Vaumousse, D ;
Cerezo, A ;
Warren, PJ .
ULTRAMICROSCOPY, 2003, 95 (1-4) :215-221
[9]  
Yamada K., 2001, Journal of Japan Institute of Light Metals, V51, P215, DOI 10.2464/jilm.51.215
[10]   Effects of quenching conditions on two-step aging behavior of Al-Mg-Si alloys [J].
Yamada, K ;
Sato, T ;
Kamio, A .
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :669-674
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