熔体超声处理对Sn-Zn合金组织与性能的影响

Effect of melt ultrasonic treatment on microstructure and properties of Sn-Zn alloy

通过测试合金导电率、抗拉强度、硬度及观察合金显微组织,研究了超声功率、超声时间以及施振温度3个参数变化对Sn-9Zn合金组织与性能的影响。结果表明,施加超声波后,合金组织细化明显,抗拉强度和硬度提高,而组织细化造成晶界增加,导致合金导电率略微降低。当超声功率、施振温度保持恒定,随着超声时间的增加,合金组织细化明显,抗拉强度、硬度大幅提高,导电率下降;当超声时间、施振温度保持恒定,随着超声功率的提高,合金组织略有细化,抗拉强度、硬度小幅提高,导电率小幅波动;当超声时间、超声功率保持恒定,随着施振温度的升高,抗拉强度、硬度先小幅上升,250℃后逐渐下降。较佳的试验方案为施振温度为250℃、超声波输出功率为700 W、超声时间为45 s。

Effects of ultrasonic power, ultrasonic time and ultrasonic temperature and their changes on microstructure and properties of Sn- 9Zn alloy were studied by testing electric conductivity, tensile strength, hardness and observing microstructure of the alloy. The results show that after applying ultrasonic, the microstructure of the alloy is refined obviously, the tensile strength and hardness increase, and the grain boundary is increased, which leads to the slight decrease of the conductivity. When the ultrasonic power and the ultrasonic temperature keep constant, with the increase of ultrasonic time, the microstrueture refinement of the alloy is obvious, the tensile strength and hardness increased significantly, and the electrical conductivity decreases ; when the ultrasonic time and the vibration temperature keep constant, with the increase of ultrasonic power, the microstructure of the alloy is slightly refined, the tensile strength and hardness increase slightly, and the conductivity of the alloy increases slightly ; when the ultrasonic power and the ultrasonic time keep constant, with the increase of the vibration temperature, the tensile strength and hardness increase slightly, and then decrease gradually after 250 ℃. Thus the best test plan is concluded that the vibration temperature is 250℃, the ultrasonic output power is 700 W and the ultrasonic time is 45 s.