Modification of Mg2Si morphology in Mg-Si alloys with Bi

作者：Guo E J; Ma B X^*; Wang L P

来源：Journal of Materials Processing Technology, 2008, 206(1-3): 161-166.

DOI：10.1016/j.jmatprotec.2007.12.038

• modification
• magnesium
• microstructure
• Mg2Si
• bismuth

The effect of bismuth (Bi) addition on primary Mg2Si phases in Mg-Si alloys was investigated. it is found that proper amount of Bi in the alloys is efficient in refining the microstructure of Mg-Si alloys. According to the present experiment, the optimal modification effect is obtained when the Bi content in the alloy is 0.5%. The size of primary Mg2Si is significantly decreased to 15 mu m or less, and its morphology is changed from coarse dendritic shape to polyhedral shape. However, when the Bi content is increased to or exceeds 0.8%, it is found that many primary Mg2Si become coarse again. Moreover, a small amount of Mg-Bi intermetallic compounds in the form of Mg3Bi2 are formed in the eutectic microstructure of the alloys with 0.5, 0.8 and 1%Bi.

• 出版日期2008-9-12
• 单位哈尔滨学院