Effect of Nb on the mechanical properties of Ti/Al2O3 composite

Wang Zhi; Xu Kun; Shen Qiang; Wang Yingzi; Zhang Lianmeng

doi:10.1007/BF02870867

Journal of Wuhan University of Technology Materials Science Edition ›› 2005, Vol. 20 ›› Issue (1) : 30 -33. DOI: 10.1007/BF02870867

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Effect of Nb on the mechanical properties of Ti/Al₂O₃ composite

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Abstract

Ti/Al₂O₃ composite with improved mechanical properties was synthesized by the spark plasma sintering. The effect of Nb on the microstructure of the composite was analyzed by TEM, SEM and so on. The experimental results indicate that the bending strength, fracture toughness, micro-hardness and relative density of the composite are 897.29MPa, 17.38MPa·m^1/2, 17.13GPa and 99.24% respectively when adding 1.5vol Nb. The bending strength is improved by reason of forming dislocation ring and transfering fracture mode from integranular to mixture fracture of intergranular and transgranular. The crack propagating is mainly the deflection bridging. It indicates a reduction of crack driving force and an increase in crack growth resistance, which results in toughness enhanced.

Keywords

spark plasma sintering / Ti/Al₂O₃ composite / niobium / mechanical properties

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Wang Zhi, Xu Kun, Shen Qiang, Wang Yingzi, Zhang Lianmeng. Effect of Nb on the mechanical properties of Ti/Al₂O₃ composite. Journal of Wuhan University of Technology Materials Science Edition, 2005, 20(1): 30-33 DOI:10.1007/BF02870867

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