Phase transformation mechanism of Al4C3 by the diffusion of Si and a novel method for in situ synthesis of SiC particles in Al melt
Phase transformation mechanism of Al4C3 by the diffusion of Si and a novel method for in situ synthesis of SiC particles in Al melt
复制标题
Si扩散引起的Al4C3相变机理及Al熔体中原位合成SiC颗粒的新方法
DOI：
10.1016/j.jallcom.2016.05.234
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发表时间：
2016-11
影响因子：
6.2
通讯作者：
Liu Xiangfa
中科院分区：
文献类型：
--
作者：
Gao Tong;Wang Dong;Du Xiaofan;Li Dakui;Liu Xiangfa
由于碳在铝熔体中的润湿性很差，溶解度极低，在铝熔体中原位合成SiC颗粒相当困难。本文设计了一种液-固反应器。Si原子扩散进入Al4C3相，导致Al4C3 → Al4SiC4 → SiC的逐步转变。Si的含量是影响相变过程的关键因素，只有在较高的Si含量下才能合成SiC。将这一机理应用于铸造法，成功制备了SiC增强Al单键18Si合金，提高了合金的硬度、耐磨性和拉伸性能。该方法为原位SiC颗粒增强Al-Si基复合材料的制备提供了新的思路。
The in situ synthesis of SiC particles in Al melt is reasonably difficult since carbon has quite poor wettability and extremely tiny solubility in the melt. A liquid–solid reaction couple was designed in this paper. Si atoms diffuse into Al4C3phase, resulting in the gradual transformation Al4C3→Al4SiC4→SiC. The concentration of Si is a key factor affecting the transformation procedure, and SiC can only be synthesized at a relatively high Si content. By applying the mechanism into casting method, SiCpreinforced Alsingle bond18Si alloys were successfully prepared, and the hardness, wear resistance and tensile properties were improved. The method provides a novel suggestion for the preparation of in situ SiC particles reinforced Al-Si matrix composites.
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