In situ small-angle scattering study of the precipitation kinetics in an Al-Zr-Sc alloy

被引：81
作者：
Deschamps, A. [1 ]
Lae, L. [1 ]
Guyot, P. [1 ]
机构：
[1] Inst Natl Polytech Grenoble, SIMAP, UJF, F-38402 St Martin Dheres, France
来源：
ACTA MATERIALIA | 2007年 / 55卷 / 08期
关键词：
small angle X-ray scattering; aluminium alloys; Al-Zr-Sc; precipitation; chemical heterogeneity;
D O I：
10.1016/j.actamat.2006.12.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A time-resolved small-angle X-ray scattering (SAXS) study was carried out to investigate the precipitation kinetics of Ll(2) Al-3(Zr, Sc) precipitates in aluminium at temperatures ranging between 400 and 475 degrees C. It is shown that the chemical heterogeneity of the precipitates, which consist of a Se-rich core and a Zr-rich shell, results in a characteristic SAXS signal, which can be fitted by a three-phase model to extract the chemical and morphological features of the precipitate size distribution. The experimental results show a strong effect of the heating rate on the precipitation kinetics, and a precipitate density strikingly constant with time in the investigated range. These results are discussed in view of the mechanisms proposed in the existing literature for the formation of the core-shell structure of these precipitates. (C) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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收藏
页码：2775 / 2783
页数：9
相关论文
共 29 条
  • [1] BAKKER H., 1990, Diffusion in solid metals and alloys
  • [2] Complex precipitation pathways in multicomponent alloys
    Clouet, Emmanuel
    Lae, Ludovic
    Epicier, Thierry
    Lefebvre, Williams
    Nastar, Maylise
    Deschamps, Alexis
    [J]. NATURE MATERIALS, 2006, 5 (06) : 482 - 488
  • [3] DAVYDOV VG, 1996, METALLOVEDENIE TERMI, V25
  • [4] Study of precipitation kinetics: towards non-isothermal and coupled phenomena
    Deschamps, A
    Genevois, C
    Nicolas, M
    Perrard, F
    Bley, F
    [J]. PHILOSOPHICAL MAGAZINE, 2005, 85 (26-27) : 3091 - 3112
  • [5] DESCHAMPS A, 2004, MAT TECH PARIS, V92, P41
  • [6] THE EFFECT OF SOLUTION TREATMENT ON THE AGING PROCESSES OF AL-SC ALLOYS
    DRITS, ME
    DUTKIEWICZ, J
    TOROPOVA, LS
    SALAWA, J
    [J]. CRYSTAL RESEARCH AND TECHNOLOGY, 1984, 19 (10) : 1325 - 1330
  • [7] SHAPE AND INTERNAL STRUCTURE OF GUINIER-PRESTON ZONES IN AL-AG
    DUBEY, PA
    SCHONFELD, B
    KOSTORZ, G
    [J]. ACTA METALLURGICA ET MATERIALIA, 1991, 39 (06): : 1161 - 1170
  • [8] Characterisation of the composition and volume fraction of η′ and η precipitates in an Al-Zn-Mg alloy by a combination of atom probe, small-angle X-ray scattering and transmission electron microscopy
    Dumont, M
    Lefebvre, W
    Doisneau-Cottignies, B
    Deschamps, A
    [J]. ACTA MATERIALIA, 2005, 53 (10) : 2881 - 2892
  • [9] Three dimensional atom probe investigation on the formation of Al3(Sc,Zr)-dispersoids in aluminium alloys
    Forbord, B
    Lefebvre, W
    Danoix, F
    Hallem, H
    Marthinsen, K
    [J]. SCRIPTA MATERIALIA, 2004, 51 (04) : 333 - 337
  • [10] Small-angle scattering in materials science - a short review of applications in alloys, ceramics and composite materials
    Fratzl, P
    [J]. JOURNAL OF APPLIED CRYSTALLOGRAPHY, 2003, 36 (01): : 397 - 404
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