Crystallography of surface precipitates associated with shape change in a Ti-5.26 wt.% Cr alloy

Qiu, Dong, Zhang, Ming-Xing, Kelly, Patrick M. and Furuhara, Tadashi (2013) Crystallography of surface precipitates associated with shape change in a Ti-5.26 wt.% Cr alloy. Acta Materialia, 61 20: 7624-7638. doi:10.1016/j.actamat.2013.08.067


Author Qiu, Dong
Zhang, Ming-Xing
Kelly, Patrick M.
Furuhara, Tadashi
Title Crystallography of surface precipitates associated with shape change in a Ti-5.26 wt.% Cr alloy
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
1873-2453
Publication date 2013
Sub-type Article (original research)
DOI 10.1016/j.actamat.2013.08.067
Volume 61
Issue 20
Start page 7624
End page 7638
Total pages 15
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Collection year 2014
Language eng
Subject 2503 Ceramics and Composites
2506 Metals and Alloys
2507 Polymers and Plastics
2504 Electronic, Optical and Magnetic Materials
Abstract The crystallographic features of surface α precipitates accompanied by surface tilt(s) in a Ti-5.26 wt.% Cr alloy have been comprehensively studied by transmission electron microscopy of samples prepared using a focused ion beam. For comparison, the bulk precipitates formed far below the free surface in the same alloy have also been examined. It is found that both the surface and the bulk α precipitates exhibit a lath-shaped morphology and their habit plane always contains a single set of misfit dislocations with the Burgers vector [11̄1]β/2|[21̄1̄3]α/6. However, the surface precipitates differ from the bulk ones in terms of their orientation relationship with the matrix, the habit plane and the long axis direction. As a result, the interphase interface between the surface precipitates and matrix contains glissile dislocations and the interface of bulk precipitates is associated with sessile dislocations. Such a glissile interface is one of the major common features of displacive-diffusional and martensitic transformations and can be used to further understand the mechanism of bainitic transformation in steels and other alloy systems.
Keyword Crystallography
Interfacial structure
Phase transformations
Surface relief
Ti alloys
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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Created: Tue, 19 Nov 2013, 11:36:09 EST by Katie Gollschewski on behalf of School of Mechanical and Mining Engineering