【摘要】：Al-Si二元共晶反應(yīng)發(fā)生在凝固后期,共晶(團)晶粒的形核、生長都直接影響縮松、熱裂等缺陷的形成、雜質(zhì)元素及化合物的分布等。對Al Si10.5亞共晶合金進行Sr變質(zhì),對未變質(zhì)與變質(zhì)合金進行微觀組織觀察和EBSD分析,并對未變質(zhì)合金進行熱分析。結(jié)果表明:無論變質(zhì)與否,共晶在初生枝晶上形核和在枝晶間異質(zhì)上形核的這兩種情況都存在,并且Sr對初生α-Al有明顯的變質(zhì)效果,富Fe相可能對共晶Si相形核有較大影響。
[Abstract]:The binary eutectic reaction of Al-Si occurs at the late solidification stage. The nucleation and growth of eutectic (cluster) grains directly affect the formation of defects, such as shrinkage, hot cracking, and the distribution of impurity elements and compounds. The Al Si10.5 hypoeutectic alloy was modified by Sr, the microstructure and EBSD analysis of the unmodified and modified alloy were carried out, and the thermal analysis of the unmodified alloy was carried out. The results show that both eutectic nucleation on primary dendrite and heterogeneous nucleation between dendrites exist, and Sr has obvious metamorphism effect on primary 偽-Al. The Fe-rich phase may have a great influence on the nucleation of eutectic Si phase.
【作者單位】： 鹽城工業(yè)職業(yè)技術(shù)學(xué)院汽車工程學(xué)院;
【分類號】：TG146.21

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