热处理对TiNi51/Ta记忆合金复合丝超弹性和比吸能的影响

Effect of Heat Treatment on Superelasticity and Specific Energy Absorption of TiNi51/Ta Memory Alloy Composite Wire

通过差示扫描量热法和拉伸测试等方法,研究热处理制度对TiNi51/Ta复合丝超弹性和比吸能的影响。结果表明,TiNi51/Ta SMA复合丝超弹性上下平台应力差明显大于TiNi51合金,因此比吸能明显优于TiNi51合金丝。随着热处理温度升高,复合丝超弹性上下平台应力逐渐下降,下平台应力下降更显著,复合丝比吸能提高,500℃/12 s在线热处理复合丝比吸能3.18 J/g。热处理温度不变时间延长至15 min,复合丝超弹性和比吸能与在线热处理的规律相同,但热处理时间延长,比吸能略有降低,500℃/15 min热处理比吸能3.04 J/g。

In this paper,the effects of heat treatment on the superelasticity and specific energy absorption of TiNi51/Ta composite filament are studied by differential scanning calorimetry and tensile testing.The results show that the superelastic upper and lower platform stress difference of TiNi51/Ta SMA composite wire is obviously greater than that of TiNi51 alloy wire is obviously better.With the increase of heat treatment temperature,the superelastic stress on the upper and lower platform of composite wire gradually decreased,and the lower platform stress decreased more significantly.The specific energy absorption of the composite wire increased,and the specific energy absorption of the composite wire during online heat treatment at 500℃/12 s is 3.18 J/g.The superelasticity and specific energy absorption of the composite wire are the same as that of online heat treatment when the temperature remained constant for 15 min,but the heat treatment time is prolonged and the specific energy absorption is slightly reduced.The specific energy absorption of 500℃/15 min heat treatment is 3.04 J/g.