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Fabrication of TiB2/Al composite by melt-SHS process with different content of titanium powder

Published online by Cambridge University Press:  23 May 2017

He Li ,
Lihua Chai ,
Haijing Wang ,
Ziyong Chen ,
Guodong Shi ,
Zhilei Xiang  and
Tounan Jin
He Li
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Lihua Chai
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Haijing Wang
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Ziyong Chen*
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Guodong Shi
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Zhilei Xiang
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
Tounan Jin
Affiliation:
College of Materials Science and Engineering, Beijing University of Technology, Chaoyang District, Beijing 100122, China
*
a) Address all correspondence to this author. e-mail: czy@bjut.edu.cn
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Abstract

Melt-SHS (self-propagating high-temperature synthesis), based on the SHS process and oxide reaction method, was used for preparation of TiB2/Al composites. The mass ratio of two reactants, Ti powder/TiO2, in initial powder mixture was varied from 0:1 to 1:0. The results showed that the 5 wt% TiB2/Al composites could be successfully produced by a reaction of aluminum powder, TiO2, and B2O3 in Al melt at 950 °C, while the reaction rate was slow. The addition of titanium powder helps to reduce the content of Al2O3 and destroy the coating structure of Al2O3 covered TiB2 particles, which leads to the acceleration of reaction process and improvement of particle concentration. A significant improvement was that TiB2 particles were dispersively distributed when the mass ratio of Ti powder/TiO2 was 2:3. As a result, the 5 wt% TiB2/Al composites fabricated by melt-SHS process with modified reactants ratio showed excellent tensile properties with the ultimate tensile strength as high as 114.24 MPa. Besides, the composite also showed superior ductility.

Keywords

TiB2compositeSHSoxidetitanium powder

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Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 12 , 28 June 2017 , pp. 2352 - 2360
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Michele Manuel

References

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