Mechanism of grain refinement of Mg-Al alloys by SiC inoculation

作者：Huang Yuanding^*; Kainer Karl Ulrich; Hort Norbert

来源：Scripta Materialia, 2011, 64(8): 793-796.

DOI：10.1016/j.scriptamat.2011.01.005

• Magnesium alloys
• Carbon inoculation
• Grain refining
• Al2MgC2
• Solidification

The mechanism of grain refinement was investigated for Mg-Al alloys inoculated with SiC particles. Contrary to the previously reported Al4C3 hypothesis, the ternary carbide Al2MgC2 was observed, which has a crystal structure closer to that of Mg than to that of Al4C3. In the centre of the grains, one or more "hillocks" enriched in Al and C were observed. Based on the observed phenomena, a novel mechanism is suggested to explain the grain refinement of Mg-Al alloys with the addition of SiC particles.

• 出版日期2011-4