Microstructure and Grain Refining Efficiency of Al-5Zr-1B Master Alloy for Magnesium Alloy

作者：Wang Shuncheng^*; Zhong Fanghua; Qi Wenjun; Zheng Kaihong; Chen Xuemin

来源：Rare Metal Materials and Engineering, 2014, 43(6): 1361-1366.

• magnesium alloy
• Al-5Zr-1B master alloy
• grain refinement
• refinement mechanism

The Al-5Zr-1B master alloy was fabricated by a situ reaction from Al melt and K2ZrF4+KBF4 powder. The microstructure of Al-5Zr-1B master alloy and its grain refining effect on pure Mg and AZ31 magnesium alloy were studied by OM, XRD and SEM. The results show that the Al-5Zr-1B master alloy has a lot of ZrB2 particles with average size 0.2 mu m. The ZrB2 particles are effective nucleation cores of magnesium grains, resulting in the grains refinement of pure Mg and AZ31 magnesium alloy. With the increasing of the amount of Al-5Zr-1B alloy, the grain size of pure Mg and AZ31 magnesium alloy is decreased. When adding 0.3% Al-5Zr-1B master alloy, the average grain size of pure Mg is reduced from 1400 to 120 mu m. When adding 0.6% Al-5Zr-1B master alloy, the average grain size of AZ31 magnesium alloy is reduced from 170 to 45 mu m.

• 出版日期2014-6
• 单位中南大学