Refining and Reinforcing Effects of In Situ AlN-TiN-TiB<sub>2sub>/Al Composite Refiner on Aluminum

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• 作者：Qian Wang ; Xin Wang ; Chun Xiang Cui ; Li Chen Zhao and Shuang Jin Liu
• 刊名：Advanced Engineering Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：19
• 期：1
• 全文大小：3337K
• ISSN：1527-2648

文摘

Typical Al&ndash;Ti&ndash;B master alloys are good inoculant for aluminum alloys, which have shown obvious dependence on some alloying elements. In this work, in situ AlN&ndash;TiN&ndash;TiB<sub>2sub>/Al composite refiner was successfully prepared by nitrogen alloying based on an Al&ndash;8Ti&ndash;1B melt. It is found that the refining, tensile strength, yield strength, and hardness of the pure aluminum modified by in situ AlN&ndash;TiN&ndash;TiB<sub>2sub>/Al composite inoculant were all obviously improved. The enhanced refining and reinforcing effects of the refiner can be attributed to the following aspects: the formation of AlN and TiN particles, the homogeneous distribution of AlN, TiN, and TiB<sub>2sub> particles and the miniaturization of Al<sub>3sub>Ti phases. The above three factors are all caused by nitridation and have a combining effect for improving the nucleation rate of α-Al.