The naturally formed inclusions in an Al-3Fe alloy were investigated using a pressurized melt filtration technique. Naturally formed AlN particles with a rodlike morphology and a size distribution between 200 nm and 4 µm coexist with the native Al₂O₃ particles in the Al-3Fe alloy. These native AlN particles were investigated with scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). A well-defined orientation relationship (OR) between AlN and α-Al was found from the AlN particle embedded in α-Al. A tilt angle of 5.8 deg was observed between {111}α-Al and {0001}AlN at the α-Al/AlN interface. The atomic matching for the α-Al/AlN interface was investigated by considering interfacial segregation on the AlN particles. The heterogeneous nucleation potency of the native AlN particles was investigated. Although these native AlN particles can nucleate the α-Al, the contribution is very small. This contribution reveals the heterogeneous nucleation of α-Al on the native AlN particles and the competitive relationship between the native Al₂O₃ and AlN as the nucleation substrates. The surface modification of the native AlN in Al alloys containing multiple alloy elements and the corresponding effects on the heterogeneous nucleation were preliminarily investigated.

使用加压熔体过滤技术研究了Al-3Fe合金中天然形成的夹杂物。自然形成的AlN颗粒与棒状的形态和在200nm和4之间的尺寸分布μ与天然铝米共存₂ Ó ₃中的Al-3FE合金颗粒。这些天然AlN颗粒用扫描电子显微镜（SEM）和高分辨率透射电子显微镜（HRTEM）进行了研究。从嵌入在α- Al中的AlN颗粒中发现了AlN与α- Al之间明确定义的取向关系（OR）。在{111} α- Al和{0001} AlN之间，在α处观察到5.8度的倾斜角-Al / AlN接口。考虑到AlN颗粒的界面偏析，研究了α- Al / AlN界面的原子匹配。研究了天然AlN颗粒的异质成核能力。尽管这些天然AlN颗粒可以使α- Al成核，但贡献很小。这一贡献揭示了天然AlN颗粒上α- Al的异相成核以及天然Al ₂ O ₃与作为成核底物的AlN之间的竞争关系。初步研究了含多种合金元素的铝合金中天然AlN的表面改性及其对异相形核的影响。