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Fabrication of dense alumina layer on Ti alloy hybrid by cold metal transfer and micro-arc oxidation methods

Published online by Cambridge University Press:  03 April 2017

Rohit Khanna*
Affiliation:
Department of Mechanical Engineering, The University of Texas at San Antonio, San Antonio, TX 78249, USA
Ganapathiyankavu Pisharam Rajeev
Affiliation:
Department of Metallurgical and Materials Engineering, Materials Joining Laboratory, Indian Institute of Technology Madras, Chennai 600036, India
Hiroaki Takadama
Affiliation:
Department of Biomedical Sciences, College of Life & Health Sciences, Chubu University, Kasugai, Aichi 487-8501, Japan
Srinivasa Rao Bakshi
Affiliation:
Department of Metallurgical and Materials Engineering, Materials Joining Laboratory, Indian Institute of Technology Madras, Chennai 600036, India
*
a) Address all correspondence to this author. e-mail: [email protected], [email protected]
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Abstract

Recent advances in alumina ceramics are focused toward innovative processing routes to improve their mechanical reliability while retaining their superior wear resistance, which might be possible if a thin layer of dense alumina can be formed on a metallic substrate such as Ti–6Al–4V with high mechanical strength. For this purpose, we propose a new two-step process in which a dense layer of Al deposited on the Ti alloy by cold metal transfer method, formed a dense Al3Ti gradient reaction layer at their interface to improve adhesion in a single step. Subsequent micro-arc oxidation treatment transformed Al layer to a graded alumina layer in which γ-alumina decreased and α-alumina increased with increasing depth. Abrasion of outer regions revealed underlying pure α-alumina regions with high Vickers hardness matching with that of sintered alumina. The designed alumina/Ti alloy hybrid can be a potential candidate for wear resistance applications.

Type
Invited Articles
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Eugene Medvedovski

References

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