The effect of alloying on thermal displacements in uranium and plutonium alloys and the mechanism of stabilization of high-temperature phases by alloying

被引：9
|
作者：
Blanter, M. S.
Glazkov, V. P.
Somenkov, V. A.
Orlov, V. K.
Laushkin, A. V.
机构：
[1] Kurchatov Inst, Russian Res Ctr, Moscow 123182, Russia
[2] Bochvar All Russia Res Inst Inorgan Mat, Moscow 123060, Russia
来源：
PHYSICS OF METALS AND METALLOGRAPHY | 2006年 / 101卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
63.20.-e; 64.70.Kb;
D O I：
10.1134/S0031918X06020086
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effect of light alloying elements in heavy matrices (Mo and Nb in U; Al, Ga, and Ce in Pu) on the magnitude of mean-square thermal atomic displacements < u(2)> has been analyzed. It is shown that light atoms decrease < u(2)> due to the appearance of an additional line in the phonon spectrum at a frequency above the Debye frequency of the matrix. This results in a stabilization of high-temperature (cubic) polymorphic modifications that have high solubility of alloying elements. The proposed model of < u(2)> changes allows us to explain both the stability of gamma-uranium and delta-plutonium in alloys at room temperature and an increase in the melting temperature of these metals upon alloying.
引用
收藏
页码：153 / 158
页数：6
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