| With the continuous development of society,Aluminum alloy material is playing a more and more important role in the industrial evolution. Choosing the Al-5Ti-B as the example,aluminum Refining can optimize the casting organization. Thereby, it can improve the overall performance of the aluminum alloy.According to the refinement mechanism of refiner, the TiC and B4C were chosen to be the refiners to study their refining ability. Depending on the multiphase powder dispersion technology, it was found that adding Tween 80 by 0.6% into deionized water, which contains TiC powder and its pH value was 8, was a good dispersion process of TiC. After scanning electron microscope, it was found that this dispersion process can deduce TiC powder from 1.34μm to 0.69μm. After pretreatment of dispersion, there was some particles with very small size in the B4C powder. Then these dispersed or undispersed TiC, B4C and Al-5Ti-B were used to create 9 different kinds of refiners so as to study their refining ability.At first, these 9 kinds of refiners were put into the Al-4.5%Cu alloy liquid in 690℃. By comparing the average grain size of pouring samples, it was found that both of TiC and B4C can refine the grain of Al-4.5%Cu casting alloy, and their refining ability was all better than Al-5Ti-B. Moreover, the TiC refiner was the most effective one relatively among these 9 kinds of refiners, while the B4C refiner was the worst one. The TiC refiner could deduce the grain size of Al-4.5%Cu casting alloy from about 92μm to about 52 μm.Then, the TiC refiner, the B4C refiner and the Al-5Ti-B were put into the Al-4.5%Cu alloy liquid in 720℃. By comparing the average grain size of pouring samples, it was found that the B4C was more effective than TiC to refiner the grain of Al-4.5%Cu alloy. It could deduce the size of grain from about 86 μm to about 55 μm which was even smaller than the grain size of ZL205 A. At the same time, the TiC refiner and the B4C refiner were both more effective than the Al-5Ti-B. |
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