生物醫(yī)用Ti-Nb基合金的顯微組織與耐磨性

生物醫(yī)用Ti-Nb基合金的顯微組織與耐磨性Microstructure and wear behavior of biomedical Ti-Nb based alloys

采用金相顯微鏡和X射線衍射儀分析生物醫(yī)用Ti-22Nb，Ti-25Nb及Ti-22Nb-2Zr/Hf合金的顯微組織和相組成，采用圓盤式摩擦實(shí)驗(yàn)機(jī)和維氏硬度計(jì)研究合金的耐磨性，利用掃描電子顯微鏡觀察摩擦后合金的表面形貌，主要考察合金元素(Zr，Hf)和熱處理工藝對(duì)Ti-Nb基合金耐磨性的影響，分析其摩擦機(jī)制。結(jié)果表明：鈦合金中添加Nb，Zr，Hf元素均能夠穩(wěn)定β相；Zr和Hf元素的固溶強(qiáng)化使合金的耐磨性提高；時(shí)效處理析出α相同樣使Ti-22Nb和Ti-22Nb-2Zr/Hf合金的耐磨性得到提高。

The microstructure and phase constitution of biomedical Ti-22Nb, Ti-25Nb and Ti-22Nb-2Zr/Hf alloys were investigated by optical microscopy and X-ray diffractometry (XRD). The influence of the alloying elements (Zr and Hf) and heat treatment on the wear behavior of the alloys was revealed by ping-on-disc wear test and Vickers hardness tester. The wear morphology was observed by scanning electron microscopy. The wear mechanism was analyzed according to the experimental results. The results show that the addition of Nb, Zr and Hf elements can stabilize the β phase. The wear results indicate that the wear resistance of solution-treated titanium alloys can be improved because of the solid solution strengthening of Zr and Hf elements. In addition, aging process can also improve the wear resistance of the Ti-22Nb and Ti-22Nb-2Zr/Hf alloys with the precipitation of α phase.

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