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采用热常数测试仪和电导仪测试了Cu-37.67Zn-1.43Al合金经1~5 GPa,700℃保温20 min处理前后的热导率和电导率,用光学显微镜和透射电镜对其组织特征进行观察,并探讨了高压热处理对Cu-37.67Zn-1.43Al合金导热性能和导电性能的影响。结果表明:退火态Cu-37.67Zn-1.43Al合金的原始组织由α相和少量的β相组成。经高压热处理后,合金组织中白色块状α相数量减少,出现细条状α相,组织明显细化,细化效果随压力的增大先增强后减弱,当压力为3 GPa时,组织细化效果最好。并且,高压热处理能降低Cu-37.67Zn-1.43Al合金的热导率和电导率,在1~5 GPa范围内,随着压力的增大,该合金的热导率和电导率均先降低后升高;压力为3 GPa时,热导率和电导率均达到最低值,分别为99 W·m-1·K-1和20.86%IACS,较高压处理前分别降低了14.66%和15.07%,但经高压处理与未经高压处理的样品热导率差值随着温度的升高而逐渐减小,在25℃时,两者的差值为17 W·m-1·K-1,而在400℃时,两者的差值为4 W·m-1·K-1。其原因主要是高压热处理后Cu-37.67Zn-1.43Al合金组织细化及组织内位错密度增大。
The thermal conductivity and electrical conductivity of Cu-37.67Zn-1.43Al alloy were measured by using a thermal constant tester and a conductivity meter at 1 ~ 5 GPa and 700 ℃ for 20 min. Their microstructures were characterized by light microscopy and transmission electron microscopy. The effects of high-pressure heat treatment on the thermal conductivity and electrical conductivity of Cu-37.67Zn-1.43Al alloy were investigated. The results show that the original microstructure of annealed Cu-37.67Zn-1.43Al alloy consists of α phase and a small amount of β phase. After high-pressure heat treatment, the amount of α-phase of white lumps in the alloy decreases, the α-phase appears in the form of strip, the structure is obviously refined. The refinement effect first increases and then decreases with the increase of pressure. When the pressure is 3 GPa, best effect. Moreover, the high-pressure heat treatment can reduce the thermal conductivity and conductivity of the Cu-37.67Zn-1.43Al alloy. The thermal conductivity and the electrical conductivity of the alloy first decrease with the increase of the pressure within the range of 1-5 GPa , Respectively. When the pressure was 3 GPa, the thermal conductivity and conductivity all reached the lowest values, 99 W · m-1 · K-1 and 20.86% IACS, respectively, which decreased by 14.66% and 15.07% However, the difference of thermal conductivity between high-pressured and non-high-pressured samples decreases with increasing temperature, and the difference between them is 17 W · m-1 · K-1 at 25 ℃ At 400 ℃, the difference between the two is 4 W · m-1 · K-1. The main reason is the high-pressure heat treatment of Cu-37.67Zn-1.43Al alloy refinement and organization dislocation density increases.