Omega phase transformation - morphologies and mechanisms

被引：124

作者：

Banerjee, S. ^{[1
]}

Tewari, R. ^{[1
]}

Dey, G. K. ^{[1
]}

机构：

[1] Bhabha Atom Res Ctr, Div Mat Sci, Bombay 400085, Maharashtra, India

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2006年 / 97卷 / 07期

关键词：

group IV elements; omega phase; morphologies;

D O I：

10.3139/146.101327

中图分类号：

TF [冶金工业];

学科分类号：

0806 [冶金工程];

摘要：

Various morphologies of the omega phase are observed in the a and the beta phases of group-IV elements and their alloys where formation of this phase is induced by various means, namely, quenching from the beta-phase field, isothermal annealing, under high static as well as dynamic pressure, and irradiation. The presence of various morphologies, such as ellipsoidal, cuboidal, granular or plate shapes, under different conditions is demonstrated. It is shown that various factors, including shuffling of atoms, shearing of atomic planes, long-range diffusion of solute atoms, change in volume during transformation, etc., influence the formation of different morphologies of the omega phase. The underlying mechanisms in each case are discussed. Ordered omega phases, which exist as equilibrium phases in various alloy systems, are shown as a case of superimposition of the concentration wave on the displacement wave.

引用

页码：963 / 977

页数：15

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