论文部分内容阅读
在含1.0%Fe的铝硅合金中复合加入一定量的Mn和不同量的B,采用OM、SEM、EDS及DSC等手段研究了B含量对铸态组织、富铁相比例及形貌的影响,并探讨了复合添加Mn/B的影响机制。结果表明:适量的B对Al-Si合金晶粒度、富铁相都具有明显的细化作用;添加3%Al-3B时,富铁相体积分数和平均颗粒尺寸分别从6.73%和11.2μm降至4.13%和7.5μm;在3%之内添加Al-3B可抑制粗大初生铁相的形成,促进富铁相由粗大星状初生铁相、大尺寸树枝状、网状共生富铁相向小尺寸致密度高的树枝状、汉字状和粒状富铁相状变;过量的Al-3B易导致多边形初生铁相的出现,但合金组织和共生铁相得到进一步的细化。
The addition of a certain amount of Mn and different amounts of B to the Al-Si alloy containing 1.0% Fe was studied by OM, SEM, EDS and DSC methods to study the effect of B content on the as-cast microstructure, iron-rich phase morphology and morphology , And discussed the mechanism of Mn / B compound addition. The results show that the proper amount of B can refine grain size and iron-rich phase of Al-Si alloy. The volume fraction of iron-rich phase and average grain size increase from 6.73% and 11.2μm To 4.13% and 7.5μm, respectively. Adding Al-3B within 3% can inhibit the formation of coarse primary iron phase and promote the growth of iron-rich phase from coarse stellate primary iron phase, large-sized dendritic, Dendritic, kanji-shaped and granular iron-rich phase changes with high density. Al-3B excessively leads to the appearance of polygonal primary iron phase, but the alloy structure and the intergranular iron phase are further refined.