KINETICS OF PARTICLE GROWTH AND PARTICLE COMPOSITION OF A COMMERCIAL AL-LI ALLOY BY MEANS OF SMALL-ANGLE SCATTERING

被引：22

作者：

CAPONETTI, E ^{[1
]}

DAGUANNO, EM ^{[1
]}

TRIOLO, R ^{[1
]}

SPOONER, S ^{[1
]}

机构：

[1] OAK RIDGE NATL LAB,OAK RIDGE,TN

来源：

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1991年 / 63卷 / 05期

关键词：

D O I：

10.1080/13642819108207597

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Extending previous work done on a similar alloy, small-angle X-ray scattering measurements are reported for a commercial Al-Cu-Li alloy (2.68% Cu and 1.88% Li by weight). Data have been analysed by means of an ellipsoidal model of precipitate particles using a method previously proposed by some of us which, incorporating interparticle interference effects, reproduces the full scattering intensities of the samples studied. Particle dimensions obtained from the fit indicate that the Lifshitz-Slyozov coarsening mechanism holds for ageing at higher temperatures and longer times. The activation energy for volume diffusivity obtained is similar to that of pure binary alloys. The scattering-curve fitting parameters include the volume fractions of the delta'-phase which decrease as expected with increasing temperature. The scattering contrast between delta' and the matrix is observed to increase with temperature. On the basis of these observations, it would appear that the lithium concentrations in both the matrix and the precipitate increase with increasing temperature.

引用

页码：1201 / 1212

页数：12

共 22 条

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