Effect of Cu Addition on Thermal Properties of Mg-6Zn-xCu alloys

D. Ye, Hyun Sik Kim, M. Kang, Hae-Yong Jeong
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Abstract

In this study, Mg-Zn alloys are investigated in terms of their thermal properties after an addition of Cu. Al element is added to improve the mechanical properties and castability in general case. However, it was excluded here because it significantly decreases the thermal conductivity. On the other hand, Zn was added as a major element, which had less influence on reducing the conductivity and can complement the mechanical properties as well. Cu was also added, and it improved the heat transfer characteristics as the amount was increased. The composition ranges of Zn and Cu are 6 wt.% and 0~1.5 wt.%, respectively. Mg-6Zn-xCu alloy was prepared by a gravity casting method using a steel mold and then the thermal conductivity and the microstructure of the as-cast material were investigated. By measuring the density_(), specific heat_(Cp) and thermal diffusivity_(), the thermal conductivity_() was calculated by the equation . As the amount of Cu increased in the Mg-6Zn-xCu alloy, the heat transfer characteristics were improved, resulting in a synergistic effect which is slow when the added Cu exceeds 1 wt.%. In order to investigate the relative thermal conductivity/emission of the Mg-6Zn-xCu alloy, AZ91 and AZ31 were experimentally evaluated and compared using a separate test equipment. As a result, the Mg-6Zn-1.5Cu alloy when compared to AZ91 showed improvements in the thermal conductivity ranging from 30 to 60% with a nearly 20% improvement in the thermal emission.
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Cu添加量对Mg-6Zn-xCu合金热性能的影响
在本研究中,研究了添加Cu后Mg-Zn合金的热性能。一般情况下,加入铝元素可以改善铸件的力学性能和浇注性能。然而,这里排除了它,因为它显著降低了导热系数。另一方面,添加Zn作为主要元素,对降低电导率的影响较小,并且可以补充力学性能。同时加入Cu,随着Cu用量的增加,Cu的传热特性得到改善。锌和铜的组成范围分别为6 wt.%和0~1.5 wt.%。采用重力铸造法制备了Mg-6Zn-xCu合金,并对铸态材料的导热性能和显微组织进行了研究。通过测量密度_()、比热_(Cp)和热扩散_(),由方程计算出导热系数_()。随着Cu添加量的增加,Mg-6Zn-xCu合金的传热特性得到改善,但当Cu添加量超过1 wt.%时,增效作用缓慢。为了研究Mg-6Zn-xCu合金的相对热导率/发射率,使用单独的测试设备对AZ91和AZ31进行了实验评估和比较。结果表明,与AZ91相比,Mg-6Zn-1.5Cu合金的导热系数提高了30% ~ 60%,热发射性能提高了近20%。
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