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采用不同的腐蚀、萃取方法,研究Sr变质后Al-28%Si合金初生Si和共晶Si相的形貌变化。结果表明,变质后合金中初生Si金相组织呈鱼骨状,萃取后是由八面体堆垛形成的长条状聚集体。SEM分析显示,Sr元素在初生硅内部并未富集,Sr的加入影响了初生硅的形核,并未影响初生Si的生长过程;变质后共晶Si表现为细而短的纤维杆状组成的脊骨状结构,能谱分析显示在共晶Si生长前端存在Sr元素的富集。游离态Sr原子在Si相表面的吸附阻止了共晶Si相的片状生长,进而形成分枝细密的珊瑚状共晶Si,Sr的加入影响了共晶Si的生长过程。
Different corrosion and extraction methods were used to study the morphologies of primary Si and eutectic Si phases in Al-28% Si alloy after Sr modification. The results show that the primary Si microstructure of the alloy is fishbone after metamorphism and elongated aggregates formed by octahedral stack after extraction. SEM analysis shows that the Sr element is not enriched in the primary silicon. The addition of Sr affects the nucleation of the primary silicon without affecting the growth of the primary Si. After denatured, the eutectic Si appears as a thin and short fiber rod Of the spine-like structure, and the energy spectrum analysis shows the presence of Sr element enrichment at the eutectic Si growth front. Adsorption of free Sr atoms on the Si phase surface prevents the eutectic Si phase from growing in sheet form, resulting in the formation of finely divided coral eutectic Si. The addition of Sr affects the growth of eutectic Si.