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利用edge-to-edge matching模型从晶体学角度研究Al3Zr和Al3Nb两种金属间化合物作为铝合金晶粒细化剂的有效性。结果表明,Al3Zr和Al3Nb两种金属间化合物和铝之间的原子间距错配和面间距错配值都很小。此外,模型预测Al3Zr和Al3Nb两种金属间化合物与铝之间存在良好的晶粒取向关系。根据模型理论可以从晶体学角度证明这两种金属间化合物对铝合金是有效的晶粒异质形核细化剂。本晶体学研究为包晶铝合金Al-Zr和Al-Nb中出现的明显晶粒细化现象提供了合理解释,同时为理解晶粒细化机理提供了新方法。
The edge-to-edge matching model was used to study the effectiveness of Al3Zr and Al3Nb intermetallic compounds as grain refiner for aluminum alloy from the perspective of crystallography. The results show that the misfit of Al and the interplanar mismatch between Al3Zr and Al3Nb are very small. In addition, the model predicts a good grain-oriented relationship between Al3Zr and Al3Nb intermetallic compounds and aluminum. According to the model theory, it can be proved crystallographically that these two intermetallic compounds are effective grain-heterogeneous nucleating agents for aluminum alloys. This crystallographic study provides a reasonable explanation of the obvious grain refinement phenomena in the Al-Zr and Al-Nb alloys and provides a new way to understand the grain refinement mechanism.