The nucleation of Fe-rich phases on oxide films in Al-11.5Si-0.4Mg cast alloys
The nucleation of Fe-rich phases on oxide films in Al-11.5Si-0.4Mg cast alloys
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DOI：
10.1007/s11661-003-0253-3
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发表时间：
2003-07-01
影响因子：
2.8
通讯作者：
Campbell, J
中科院分区：
文献类型：
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作者：
Cao, X;Campbell, J
研究了不同Fe、Mn含量的Al-11.5Si-0.4Mg合金的显微组织，探讨氧化膜对液态金属中富Fe相析出的潜在影响。氧化膜通过夹带过程融入熔体中。这是一种包容性的合并机制。熔体中的折叠氧化膜有两个侧面：干燥的未粘合内表面和湿润的外表面。氧化膜的润湿外界面似乎是某些富铁相成核和生长的首选基质。预计薄膜的润湿侧与富铁相或铝基体之间将存在良好的原子接触。然而，双层膜的两个干燥面之间的间隙构成了裂纹，从而解释了在这种金属间化合物和铝基体中及其周围常见的裂纹。一些典型氧化物和 α-Fe 相（原生或脚本类型）之间的平面不重合的计算表明 MgO、MgO 。 Al2O3、γ-Al2O3 和 α-Al2O3 可能都是 α-Fe 相成核的良好基质。
The microstructures of Al-11.5Si-0.4Mg alloys with various Fe and Mn contents have been studied to investigate the potential influence of oxide films on the precipitation of Fe-rich phases from the liquid metal. Oxide films are incorporated into melts by an entrainment process. This is an enfolding mechanism of incorporation. Folded oxide films in melts have two sides: the dry unbonded inner surfaces and their wetted exterior surfaces. The wetted outer interfaces of oxide films appear to act as preferred substrates for the nucleation and growth of some Fe-rich phases. It is expected that there will be good atomic contact between the wetted side of the film and Fe-rich phases or aluminum matrix. However, the gap between the two dry sides of a double film constitutes a crack, thus explaining the commonly observed cracks in and around such intermetallics and aluminum matrix. The calculation of planar disregistries between some typical oxides and alpha-Fe phase (primary or script type) indicated that MgO, MgO . Al2O3, gamma-Al2O3, and alpha-Al2O3, might all be good substrates for the nucleation of alpha-Fe phase.