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研究了热处理后的冷却速率对Ti6Al4V-5Cu合金显微组织、力学性能、耐蚀性能及抗菌性能的影响。将合金分别进行不同冷却方式的热处理,即在740℃三相区分别进行水淬、空冷和炉冷,在820℃两相区和910℃单相区分别进行水淬。结果表明,炉冷合金由于初生a相的尺寸和体积分数最大,所以塑性最好;合金在740和820℃分别水淬后,由于组织中存在正交a′′相,其硬度和屈服强度显著降低;合金在910℃水淬后由于存在针状的hcp a′相,其硬度和抗拉强度最高,但塑性最差。随着热处理温度的升高,合金中的元素分布逐渐均匀,其耐蚀性能随之提高。改变冷却速率并不明显影响合金的抗菌性能,不同冷却速率下的合金都具有优异的抗菌性能。
The effects of cooling rate after heat treatment on the microstructure, mechanical properties, corrosion resistance and antibacterial properties of Ti6Al4V-5Cu alloy were studied. The alloys were respectively heat-treated by different cooling methods, that is, water quenching, air cooling and furnace cooling were respectively carried out in the three-phase region of 740 ° C., and the water quenching was carried out in the two-phase region of 820 ° C. and the single-phase region of 910 ° C. respectively. The results show that the ductility and yield strength of the as-cast alloy are the best because of the size and volume fraction of primary a phase. When the alloy is water-quenched at 740 and 820 ℃ respectively, the hardness and yield strength are significant Decreased; the hardness and tensile strength of the alloy after water quenching at 910 ℃ were the highest because of the presence of acicular hcp a ’phase, but the plasticity was the worst. With the heat treatment temperature increases, the elemental distribution of the alloy gradually uniform, and its corrosion resistance increases. Changing the cooling rate does not significantly affect the antibacterial properties of the alloy, the alloy at different cooling rates have excellent antibacterial properties.