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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

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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.

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Acknowledgments

This work was supported by the National Foundation of Natural Science, China (Grant Nos. 51171096, 50802057) and the Graduate Innovation Fund of Shaanxi University of Science and Technology.

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Authors and Affiliations

  1. 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

    Fen Wang, Kun Zhang, Jianfeng Zhu & Lan Ye

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  1. Fen Wang
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  2. Kun Zhang
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Correspondence to Kun Zhang.

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Wang, F., Zhang, K., Zhu, J. et al. Effect of Mn content on the microstructure and mechanical properties of (Ti,Mn)Al/Al2O3 in situ composites prepared by hot pressing. Journal of Materials Research 28, 1574–1581 (2013). https://doi.org/10.1557/jmr.2013.146

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