深冷处理对LC4铝合金热物理性能的影响  

Effect of Cryogenic Treatment on Thermal Physical Properties of LC4 Al Alloy

作　　者：徐红[1] 

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004

出　　处：《热加工工艺》2013年第8期192-194,共3页Hot Working Technology

摘　　要：利用电导仪和热膨胀仪测试了深冷处理前后LC4铝合金的电导率和热膨胀系数,并探讨了深冷处理对LC4铝合金热物理性能的影响。结果表明:深冷处理能降低退火LC4铝合金的电导率,改变热膨胀系数随温度的变化规律。当温度低于158.57℃时,深冷处理合金的热膨胀系数较相同温度下退火合金的高;高于158.57℃时,较退火合金的低。与深冷处理相比,LC4铝合金经深冷处理+时效后的电导率略有增大,但热膨胀系数随温度的变化规律变化不大。The electrical conductivity and thermal expansion coefficient of LC4 aluminum alloy before and after cryogenic treatment were measured by electric conductivity instrument and thermal dilatometer, and the effects of cryogenic treatment on the thermal physical properties of LC4 aluminum alloy were studied. The results show that the cryogenic treatment can reduce the electrical conductivity of annealed LC4 aluminum alloy, and change the trend of the thermal expansion curve. At the same temperature, when the temperature is lower than 158.57 ℃, the thermal expansion coefficient of the alloy after cryogenic treatment is larger than that of annealed alloy, but is less than that of annealed alloy, when the temperature is higher than 158.57 ℃. Compared with cryogenic treatment, the electrical conductivity of the alloy after cryogenic treatment and aging treatment is large, but the change regularity of thermal expansion coefficient with temperature is not obvious.

关 键 词：LC4铝合金 深冷处理 电导率 热膨胀系数 

分 类 号：TG156.9[金属学及工艺—热处理]