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.
引用
收藏
页码：2775 / 2783
页数：9
相关论文
共 29 条
[21]   A study of coarsening, recrystallization, and morphology of microstructure in Al-Sc-(Zr)-(Mg) alloys [J].
Riddle, YW ;
Sanders, TH .
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 2004, 35A (01) :341-350
[22]   A new model for prediction of dispersoid precipitation in aluminium alloys containing zirconium and scandium [J].
Robson, JD .
ACTA MATERIALIA, 2004, 52 (06) :1409-1421
[23]   Extension of the N-model to predict competing homogeneous and heterogeneous precipitation in Al-Sc alloys [J].
Robson, JD ;
Jones, MJ ;
Prangnell, PB .
ACTA MATERIALIA, 2003, 51 (05) :1453-1468
[24]   Effect of scandium on recrystallization of aluminum and its alloys [J].
Rostova, TD ;
Davydov, VG ;
Yelagin, VI ;
Zakharov, VV .
ALUMINIUM ALLOYS: THEIR PHYSICAL AND MECHANICAL PROPERTIES, PTS 1-3, 2000, 331-3 :793-798
[25]  
Royset J., 2004, MATER FORUM, V28, P1210
[26]  
Sugamata M., 2004, MATER FORUM, V28, p514A
[27]   Segregation in Al3(Sc,Zr) precipitates in Al-Sc-Zr alloys [J].
Tolley, A ;
Radmilovic, V ;
Dahmen, U .
SCRIPTA MATERIALIA, 2005, 52 (07) :621-625
[28]  
TOROPOVA LS, 1990, FIZ MET METALLOVED+, P108
[29]  
YELAGIN VI, 1985, FIZ MET METALLOVED+, V60, P97
123