Effect of annealing temperature on microstructure and properties of HA/Ti-24Nb-4Zr composites

doi:10.13251/j.issn.0254-6051.2020.10.019

Abstract

Abstract: HA/Ti-24Nb-4Zr biocomposites were prepared by spark plasma sintering (SPS) technology, and the effects of different annealing temperatures on the microstructure and mechanical properties (compressive strength, yield strength, yield ratio, compressive elastic modulus) of the composites were investigated. The results show that the as-sintered composites consist of matrix of β-Ti phase, residual of primary α-Ti phase and HA(hydroxyapatite) phase. With the increase of annealing temperature, the content and grain size of the β-Ti phase in the composite matrix are increased gradually, while the needle-like secondary α-Ti phases are precipitated continuously within the grain boundary and inside the grain. Meanwhile, the microstructure and content of HA phase have little change. Compared with that of the as-sintered, the strength and elastic modulus of the composites annealed at different temperatures are increased slightly at first and then decreased, while the ductility tends to be improved continuously after annealing. After annealing at 850 ℃, the compressive strength, yield strength, yield ratio and elastic modulus of the composites are 1507 MPa, 1270 MPa, 0.84 and 42 GPa respectively, that is, the ductility of the composites is improved obviously. This suggests that the HA/Ti-24Nb-4Zr biocomposite is a potential biomaterial for orthopedic replacement or implants.

Key words: titanium matrix biocomposites, spark plasma sintering, annealing temperature, microstructure, mechanical properties

CLC Number:

TB333

Lei Yutao, Zhu Bin, Zhang Yuqin, Jiang Yehua. Effect of annealing temperature on microstructure and properties of HA/Ti-24Nb-4Zr composites[J]. Heat Treatment of Metals, 2020, 45(10): 94-98.

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