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对B和C微合金化的Ti-3.5Al-5Mo合金医疗器械进行了固溶与时效热处理,观察了不同热处理制度下钛合金的组织与力学性能变化。结果表明,经过固溶与时效热处理的钛合金中出现了细小的Ti B相或者Ti C相,并且可以有效抑制合金中β晶粒的长大,同时还存在细小的次生α相;当时效热处理制度选定为550℃×6 h时,随着固溶温度的上升,抗拉强度和屈服强度逐渐降低,断后伸长率和断面收缩率也表现为逐渐降低的趋势;在790℃×1.5h固溶+550℃×6 h时效时可以取得最好的强度与塑性结合。
The B and C microalloyed Ti-3.5Al-5Mo alloy medical devices were treated by solution heat treatment and aging treatment. The microstructure and mechanical properties of Ti-3.5Al-5Mo alloy were observed under different heat treatment conditions. The results show that TiB phase or TiC phase appears in Ti alloy after solution treatment and aging treatment, and can effectively restrain the growth of β grains in the alloy and the existence of small secondary α phase. When the heat treatment system is selected as 550 ℃ × 6 h, the tensile strength and yield strength decrease gradually with the increase of solution temperature, and the elongation at break and the reduction of area also show a gradually decreasing trend. At 790 ℃ × 1.5 h solution + 550 ℃ × 6 h aging can get the best combination of strength and plasticity.