PHASE-SEPARATION IN A TI-AL-MO ALLOY STUDIED BY ANOMALOUS SMALL-ANGLE X-RAY-SCATTERING - A SYNCHROTRON RADIATION EXPERIMENT

被引：9

作者：

DJANARTHANY, S ^{[1
]}

SERVANT, C ^{[1
]}

LYON, O ^{[1
]}

机构：

[1] UNIV PARIS 11,UTILISAT RAYONNEMENT ELECTROMAGNET LAB,F-91405 ORSAY,FRANCE

来源：

PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES | 1992年 / 66卷 / 04期

关键词：

D O I：

10.1080/01418619208201576

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mode of decomposition of the ordered beta2 phase (B2) at 450-degrees-C of the alloy Ti-21.6Al-3.4Mo has been studied by transmission electron microscopy (TEM) and anomalous small-angle X-ray scattering performed at the K Ti absorption edge. TEM observations have shown that the precipitation occurs according to a two-phase system, and the alpha2 spherical precipitates are embedded in a B2 matrix. In order to calculate the composition of both phases some parameters such as the Guinier radius R(G), the spherical excluded volume (or diameter D), the number of scattering precipitates per unit volume N(v) have been determined by fitting the theoretical scattered intensity curves derived from a two phase model of precipitation to the experimental data. The composition of alpha2 and beta2 phases is fairly constant with the ageing times considered. The plot of the ternary diagram shows that the alpha2 precipitates are slightly depleted in aluminium with ageing time as compared with the B2 matrix.

引用

页码：575 / 590

页数：16

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