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Effect of Mn content on the microstructure and mechanical properties of (Ti,Mn)Al/Al2O3 in situ composites prepared by hot pressing

Published online by Cambridge University Press:  06 June 2013

Fen Wang ,
Kun Zhang ,
Jianfeng Zhu  and
Lan Ye
Fen Wang
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, School of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi, 710021, China
Kun Zhang*
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, School of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi, 710021, China
Jianfeng Zhu
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, School of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi, 710021, China
Lan Ye
Affiliation:
Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, School of Material Science and Engineering, Shaanxi University of Science & Technology, Xi’an, Shaanxi, 710021, China
*
a)Address all correspondence to this author. e-mail: sifan279318474@yahoo.cn; sifan279318474@163.com
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Abstract

(Ti,Mn)Al/Al2O3 composites were successfully synthesized by reactive hot pressing from Ti–Al–TiO2–MnO2 system. The effect of Mn coming from the Al–MnO2 reaction on the microstructure and mechanical properties of (Ti,Mn)Al/Al2O3 in situ composites was investigated in detail. The results show that the as-prepared products are mainly composed of (Ti,Mn)Al matrix (including a little of Ti3Al) and Al2O3 particles, together with a few amount of Al77.5Mn22.5 phases. The (Ti,Mn)Al matrix is refined and the in situ generated Al2O3 particles distribute uniformly on the boundaries of (Ti,Mn)Al by incorporation of Mn. The (Ti,Mn)Al/Al2O3 composite with 1.92 wt% Mn possesses the best mechanical properties. Compared with Mn-free samples obtained from Ti–Al–TiO2 system, the hardness, flexural strength, and fracture toughness are enhanced by 53.46%, 76.49%, and 64.21%, respectively. The strengthening and toughening mechanisms were also discussed specifically.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 12 , 28 June 2013 , pp. 1574 - 1581
Copyright
Copyright © Materials Research Society 2013 

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