On the fcc→D019 transformation in Co-W alloys

被引：32
作者：
Carvalho, PA
Bronsveld, PM
Kooi, BJ
De Hosson, JTM
机构：
[1] Univ Groningen, Dept Appl Phys, Ctr Math Sci, NL-9747 AG Groningen, Netherlands
[2] Univ Groningen, Netherlands Inst Met Res, NL-9747 AG Groningen, Netherlands
来源：
ACTA MATERIALIA | 2002年 / 50卷 / 18期
关键词：
intermetallic compounds; microstructure; transmission electron microscopy (TEM); phase transformations; lattice defects;
D O I：
10.1016/S1359-6454(02)00269-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The continuous precipitation of D0(19) Co3W from a highly supersaturated Co-rich fcc matrix has been investigated. A detailed analysis of planar defects generated in the precipitates has been carried out using conventional and high-resolution transmission electron microscopy. The spatial arrangement of stacking faults and antiphase boundaries revealed the actual defect formation mechanisms and disclosed important aspects of the phase transformation at an atomic level. The results point to a displacive/diffusional Widmanstatten type of transformation, which is not simply based on a common ledge growth and, furthermore, follows the path: fcc-->hcp-->D0(19). The alpha' + Co7W6-->Co3W peritectoid transformation has also been studied. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
引用
收藏
页码：4511 / 4526
页数：16
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