Heterogeneous nucleation of martensite near free surface

被引：13

作者：

Gutkin, MY ^{[1
]}

Mikaelyan, KN ^{[1
]}

Verijenko, VE ^{[1
]}

机构：

[1] Univ KwaZulu Natal, Sch Mech Engn, ZA-4041 Durban, South Africa

来源：

ACTA MATERIALIA | 2001年 / 49卷 / 18期

关键词：

phase transformations; heterogeneous martensite nucleation; dislocations-theory; surface; grain boundaries;

D O I：

10.1016/S1359-6454(01)00260-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A theoretical model is proposed which describes heterogeneous nucleation of an embryo of hcp-martensite near a free surface at a tilt grain boundary segment containing some extrinsic dislocations. The total energy gain due to the hep-embryo nucleation is analysed in detail depending on internal (the distance from free surface and orientation of the grain boundary plane) and external (the temperature and shear stress) conditions. It is shown that the main characteristics of the hcp-embryo nucleation (the energy barrier and critical size) depend strongly on the distance from the free surface. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：3811 / 3819

页数：9

共 13 条

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