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研究了冷加工变形量为48%的Ti-Ni合金经中温退火(350～600℃)处理后退火温度对合金显微组织及室温力学性能的影响。结果表明,变形后获得部分非晶的纳米组织,400℃退火后合金发生再结晶;500℃退火后完成再结晶,晶粒开始长大;600℃退火后合金组织完全粗化,室温下为粗大的自协调马氏体。退火温度升高,合金的抗拉强度大大下降,当退火温度高于500℃时,伸长率大大增加,伸长率大于50%。室温下合金拉伸变形时应力诱发马氏体相变的临界应力值σs受退火温度和相变温度的制约。
The effect of annealing temperature on the microstructure and room-temperature mechanical properties of Ti-Ni alloy annealed at medium temperature (350-600 ℃) was investigated. The results show that some amorphous nanostructures are obtained after deformation, the alloy recrystallizes after annealing at 400 ℃, recrystallization recrystallizes after annealing at 500 ℃, and the grain begins to grow. After annealing at 600 ℃, the alloy structure is completely roughened and coarse at room temperature Self-coordinating martensite. When the annealing temperature increases, the tensile strength of the alloy decreases greatly. When the annealing temperature is higher than 500 ℃, the elongation increases greatly, and the elongation is more than 50%. The critical stress σs of stress-induced martensitic transformation at room temperature is determined by the annealing temperature and transformation temperature.