Influence of Si,Cu, B,and Trace Alloying Elements on the Conductivity of the Al-Si-Cu Alloy |
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| Authors: | Zhao Yang Xiaolong He Bin Li Andrej Atrens Xuyue Yang Hanming Cheng |
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| Affiliation: | 1.School of Materials Science and Engineering, Central South University, Changsha 410083, China; (X.H.); (B.L.); (X.Y.);2.School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;3.Nantong Hongjin Aluminum Investment Co., Ltd., Nantong 226300, China; |
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| Abstract: | The influence of Si, Cu, B, and trace alloying elements on the conductivity of aluminum die cast 12 (ADC12) alloy was investigated. The conductivity decreased linearly with increasing volume fraction of the Si phase attributed to a linear decrease of the volume of the more conductive Al phase through a rule of mixtures. The conductivity also decreased with increasing Cu content, between 0~3%. The conductivity increased with increasing B content, reached the peak at 0.02% B and thereafter decreased somewhat. The mechanism was that B reacted with the transition element in the Al phase to form boride, decreasing the transition element concentration in the Al lattice, and decreasing the lattice constant. The thermal conductivity, λ, was related to the electrical conductivity, , by means of , where L is the apparent Lorentz constant, 1.86 × 10−8; T is the absolute temperature, 293 K; λg is the lattice conductivity, 42.3 W/(m·K). |
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| Keywords: | aluminum alloy ADC12 conductivity Al-B master alloy micro-alloying |
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