论文部分内容阅读
本文研究了微量稀土(MM)、(Cr+Ti)及Al-Ti-B分别或组合加入对Al-Mg-Si合金铸态组织的影响.结果表明:Al-Mg-Si合金中添加微量Al-Ti-B或Cr+Ti可显著细化铸态晶粒;Al-Ti=B与MM或(Cr+Ti)同时加入不能显著细化合金的晶粒;虽然MM单独加入时既不能细化晶粒,也不能细化枝晶,但当它与Al-Ti-B或(Cr+Ti)组合加入时,却能显著细化枝晶;且微量MM与(Cr+Ti)同时添加既能显著细化铸态晶粒,又能显著细化枝晶;有效的晶粒细化剂并不一定能有效地细化枝晶,这是由于合金结晶过程中晶粒细化和枝晶细化的机制不同造成的.
In this paper, the effects of addition of trace amounts of rare earth (MM), (Cr + Ti) and Al-Ti-B on the as-cast microstructure of Al-Mg-Si alloy were studied.The results show that the addition of trace amounts of Al -Ti-B or Cr + Ti can significantly refine as-cast grains; Al-Ti = B and (MM +) or (Cr + Ti) join the grains that do not significantly refine the alloy; However, dendrites can not be refined, but when it is added in combination with Al-Ti-B or (Cr + Ti), the dendrites can be remarkably refined; and the addition of trace amounts of MM and (Cr + Ti) Significant refinement of as-cast grains, but also significantly refined dendrites; effective grain refiner does not necessarily be able to refine the dendrite, which is due to the crystallization process of the alloy grain refinement and dendritic refinement Mechanism caused by different.