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中文摘要：
利用激光熔覆技术,在6063Al表面制备了添加稀土CeO2的Ni60合金熔覆层,并通过OM、XRD、SEM和EDS等手段进行测试分析,研究稀土CeO2对6063Al表面激光熔覆Ni基熔覆层组织、相结构、成分等微观结构的影响,探讨稀土氧化物CeO2的作用效果和机制。结果表明：加入5%CeO2可有效地减少Ni60熔覆层中的裂纹、孔洞,使熔覆层具有较好的组织形貌;5%CeO2＋Ni60熔覆层和未加CeO2的Ni60熔覆层主要相结构均为β-NiAl（Cr）和少量的NiAl3、Ni3Al、Al等,添加稀土后β-Ni Al相的（110）、（200）、（211）衍射峰和Al峰的强度有明显降低,且有明显的Ni Al3峰;相比于未添加CeO2的Ni60熔覆层,添加CeO2后的熔覆层元素分布较为均匀,稀释率降低;加入5%CeO2可使Ni60熔覆层的表层孔隙率大幅降低,细化作用明显,晶粒分布较弥散,但对熔覆层底部微观组织的改善作用不明显。
英文摘要：
Ni60 alloy cladding layer with rare earth CeO2 addition was prepared on the surface of 6063 aluminum alloys by laser cladding technology. The influence of CeO2 on the phase structure, compositions and microstructures of 6063 aluminum surface laser cladding Ni-based cladding layer was investigated by metallographic microscope, XRD, SEM and EDS. Besides, the effect and mechanism of rare earth oxide CeO2 was also explored. The results show that 5% CeO2 addition can effectively reduce the cracks and holes of Ni60 cladding layer, so the cladding layer has a better structure morphology. Both the main phase structures of 5% CeO2＋Ni60 cladding layer and Ni60 cladding layer are β-Ni Al（Cr） and a small amount of NiAl3, Ni3Al, Al, etc. After the addition of rare earth, the intensity of β-Ni Al phase（110）,（200）,（211） diffraction peaks and Al peaks are significantly reduced, and there are clear peaks of NiAl3 phase. Compared with Ni60 cladding layer without rare earth CeO2, the Ni60 cladding layer with CeO2 has a uniform element distribution and a lower dilution rate. Adding 5% CeO2 can reduce the porosity, refine the grain size and bring about more diffusively-distributed grains at the surface of Ni60 cladding layer, but its effect on the microstructure is not obvious at the bottom of the cladding layer.
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