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研究在Ti-22Nb-6Zr(at%)合金中添加不同含量(质量分数)(0.02%~1.5%)的硼元素,通过粉末烧结法成功制备了性能优良的含硼Ti-22Nb-6Zr记忆合金。结合OM、XRD、SEM分析发现,随着硼元素含量的增加,合金的β相基体中逐渐析出α相和Ti B相,晶粒得到明显细化。通过压缩力学性能测试,发现硼元素对Ti-22Nb-6Zr合金的弹性模量和超弹性影响不大,但硼含量对其屈服强度和抗压强度有显著影响,当硼含量为0.02%~0.1%和1%时,合金展现出较高的抗压强度(1450 MPa以上)和屈服强度(1250 MPa以上)。通过电化学测试,发现当硼含量在0.02%~1%时,合金具有较好的耐腐蚀性,腐蚀电流密度保持在10-6 A·cm~(-2)以内。综合考虑合金的显微组织、力学性能与抗腐蚀性能,得出Ti-22Nb-6Zr记忆合金中适宜的硼添加量为0.02%~0.1%和1%。
In this paper, boron-containing Ti-22Nb-6Zr alloys with different contents (mass fraction) (0.02% ~ 1.5%) were added into Ti-22Nb- . The results of OM, XRD and SEM show that the α phase and the Ti B phase are precipitated in the β phase matrix of the alloy with the increase of boron content, and the grains are obviously refined. Compressive mechanical tests show that boron has little effect on the elastic modulus and superelasticity of Ti-22Nb-6Zr alloy, but the boron content has a significant effect on the yield strength and compressive strength. When the boron content is 0.02% ~ 0.1 % And 1%, the alloys show higher compressive strength (above 1450 MPa) and yield strength (above 1250 MPa). Through the electrochemical test, it is found that the alloy has good corrosion resistance when the content of boron is 0.02% ~ 1%, and the corrosion current density is kept within 10-6 A · cm ~ (-2). Considering the microstructure, mechanical properties and corrosion resistance of the alloy, the appropriate boron addition in Ti-22Nb-6Zr memory alloy is 0.02% ~ 0.1% and 1%.