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采用K2Zr F4、KBF4混合粉末与铝熔体原位合成方法制备了Al-4.99Zr-1.1B合金,利用X射线衍射仪、光学显微镜和扫描电镜,研究了Al-4.99Zr-1.1B合金的显微组织及其对AZ31镁合金的晶粒细化作用。结果表明:Al-4.99Zr-1.1B合金中含有大量细小的Zr B2粒子。随着Al-4.99Zr-1.1B合金添加量的增加,AZ31镁合金的α-Mg晶粒逐渐细化,晶间β-Mg17Al12相从网状转变成细小块状。添加0.6%的Al-4.99Zr-1.1B合金,可使AZ31镁合金的α-Mg晶粒从170μm细化到45μm。Zr B2粒子作为α-Mg晶粒的异质形核核心使α-Mg晶粒得到细化。
Al-4.99Zr-1.1B alloy was prepared by in-situ synthesis of K2Zr F4, KBF4 mixed powder and aluminum melt. The effects of Al-4.99Zr-1.1B alloy on the microstructure and mechanical properties of Al-4.99Zr-1.1B alloy were studied by X-ray diffractometer, optical microscope and scanning electron microscope Microstructure and Grain Refinement of AZ31 Magnesium Alloy. The results show that the Al-4.99Zr-1.1B alloy contains a large amount of fine ZrB2 particles. With the increase of the amount of Al-4.99Zr-1.1B alloy, the α-Mg grains of AZ31 magnesium alloy gradually refined, and the intergranular β-Mg17Al12 phase transformed from the network into small lumps. Adding 0.6% Al-4.99Zr-1.1B alloy, the α-Mg grains of AZ31 magnesium alloy can be refined from 170μm to 45μm. The α-Mg grains were refined by Zr B2 particles as heterogeneous nuclei of α-Mg grains.