Influence of Si, Cu, B, and Trace Alloying Elements on the Conductivity of the Al-Si-Cu Alloy

Materials

卷:15

Hanming Cheng¹  Xiaolong He²  Xuyue Yang²  Zhao Yang²  Bin Li²  Andrej Atrens³ 

[1] Nantong Hongjin Aluminum Investment Co., Ltd., Nantong 226300, China;

[2] School of Materials Science and Engineering, Central South University, Changsha 410083, China;

[3] School of Mechanical and Mining Engineering, The University of Queensland, Brisbane, QLD 4072, Australia;

关键词: aluminum alloy;    ADC12;    conductivity;    Al-B master alloy;    micro-alloying;   

DOI  :  10.3390/ma15020426

来源: DOAJ

【 摘 要 】

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, $\sigma$, by means of $\mathsf{\lambda }=\mathrm{LT}\mathsf{\sigma }+{\mathsf{\lambda }}_{\mathrm{g}}$, where L is the apparent Lorentz constant, 1.86 × 10⁻⁸; T is the absolute temperature, 293 K; λ_g is the lattice conductivity, 42.3 W/(m·K).

【 授权许可】

Unknown