高压热处理对铝青铜热物理性能的影响

Effects of High Pressure Heat Treatment on the Thermal Physical Properties of Aluminum Bronze

在5 GPa压力下对铝青铜进行750℃、保温15 min的高压热处理,对高压热处理前后铝青铜的电导率以及25～600℃温度范围内的热扩散系数、热容和热导率进行测试,结合显微组织的观察结果,探讨了高压热处理对铝青铜热物理性能的影响。研究表明:高压热处理能增大铝青铜的热扩散系数,减小热容;对热导率而言,温度低于400℃时高压热处理能增大铝青铜的热导率,而温度高于400℃时高压热处理能减小铝青铜的热导率。分析认为,产生变化的主要原因是高压热处理使铝青铜的微观组织发生了变化。

Aluminum bronze was treated at 5 GPa and 750 ℃ for 15 min,after that its electric conductivity,thermal diffusion coefficient,heat capacity,and thermal conductivity between 25 and 600 ℃ were measured.Combining these data with the microstructure images,the effects of high pressure heat treatment on the thermal physical properties of aluminum bronze were investigated.The results showed that high pressure heat treatment can increase the thermal diffusion coefficient and decrease the heat capacity of aluminum bronze.Furthermore,the thermal conductivity of aluminum bronze after high pressure heat treatment increases with increasing temperature until 400 ℃,and then starts to decrease.Analysis shows that this is because the high pressure heat treatment makes the microstructures of aluminum bronze alloy change.