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硼對(duì)醫(yī)用Ti-22Nb-6Zr記憶合金的顯微組織及性能的影響
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廣東省科技計(jì)劃項(xiàng)目 (2012B010200020)


Effect of Boron Addition on the Microstructure and Properties of Ti-22Nb-6Zr Shape Memory Alloys
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    摘要:

    研究在Ti-22Nb-6Zr (at%) 合金中添加不同含量 (質(zhì)量分?jǐn)?shù)) (0.02%~1.5%)的硼元素，通過粉末燒結(jié)法成功制備了性能優(yōu)良的含硼Ti-22Nb-6Zr記憶合金。結(jié)合OM、XRD、SEM分析發(fā)現(xiàn)，隨著硼元素含量的增加，合金的β相基體中逐漸析出α相和TiB相，晶粒得到明顯細(xì)化。通過壓縮力學(xué)性能測(cè)試，發(fā)現(xiàn)硼元素對(duì)Ti-22Nb-6Zr合金的彈性模量和超彈性影響不大，但硼含量對(duì)其屈服強(qiáng)度和抗壓強(qiáng)度有顯著影響，當(dāng)硼含量為0.02 %~0.1%和1%時(shí)，合金展現(xiàn)出較高的抗壓強(qiáng)度（1450 MPa以上）和屈服強(qiáng)度（1250 MPa以上）。通過電化學(xué)測(cè)試，發(fā)現(xiàn)當(dāng)硼含量在0.02%~1%時(shí)，合金具有較好的耐腐蝕性，腐蝕電流密度保持在10-6 A·cm-2以內(nèi)。綜合考慮合金的顯微組織、力學(xué)性能與抗腐蝕性能，得出Ti-22Nb-6Zr記憶合金中適宜的硼添加量為0.02%~0.1%和1%

    Abstract:

    Ti-22Nb-6Zr (at%) shape memory alloys with various amount of boron (B) addition (0.02 wt%~1.5 wt%) were fabricated using a powder sintering method. Optical microscope, XRD and SEM were used to investigate the microstructure and phase constituents of the sintered alloys. It is shown that boron addition induces the precipitation of α phase and TiB phase in β matrix, which facilitates distinct refinement of microstructure. The addition of boron exerts only little influence on the Young’s modulus (around 30 GPa) and superelasticity (over 3%), but affects strongly the compression strength and yield strength of sintered Ti-22Nb-6Zr-B alloys. In order to acquire a relatively high yield strength and compression strength, the amount of boron addition into Ti-22Nb-6Zr shape memory alloys should be around 0.02 wt%~0.1 wt% and 1 wt%. Polarization curves analysis shows that the corrosion resistance of these Ti-22Nb-6Zr-B alloys is very good when boron content is about 0.02 wt%~1 wt%. Taking into account microstructure, mechanical properties and corrosion resistance, the appropriate amount of B addition for Ti-22Nb-6Zr shape memory alloys is 0.02 wt%~0.1 wt% and 1 wt%

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徐 偉,賴 銘,于 博,李松建,高 巖.硼對(duì)醫(yī)用Ti-22Nb-6Zr記憶合金的顯微組織及性能的影響[J].稀有金屬材料與工程,2015,44(12):3208~3214.[Xu Wei, Lai Ming, Yu Bo, Li Songjian, Gao Yan. Effect of Boron Addition on the Microstructure and Properties of Ti-22Nb-6Zr Shape Memory Alloys[J]. Rare Metal Materials and Engineering,2015,44(12):3208~3214.]
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  • 收稿日期:2014-12-15
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  • 在線發(fā)布日期: 2016-08-29
  • 出版日期: 2015-12-25