张政蒋文明李广宇管峰朱俊文于洋樊自田

(华中科技大学材料成形与模具技术国家重点实验室)

摘要:采用等离子喷涂工艺在A356铝合金表面制备Ni涂层，并使用消失模铸造固液复合Al/Mg双金属，通过扫描电镜、能谱仪等手段，研究不同浇注温度和Ni涂层对消失模铸造Al/Mg双金属组织的影响。结果表明，在相同工艺条件下，含Ni涂层的Al/Mg双金属界面厚度比不含Ni涂层的显著变薄，界面相组成也发生改变。浇注温度对含Ni涂层Al/Mg双金属的界面组织与成分也有影响，界面层厚度随浇注温度升高而增加，当浇注温度为730 ℃时能够获得较优良的界面组织。

关键词：浇注温度；Ni涂层；消失模铸造；Al/Mg双金属；界面组织

中图分类号:TG249.6；TG292；TB331   文献标志码    A

DOI:10.15980/j.tzzz.2020.05.018

Effects of Pouring Temperature and Ni Coating on Interfacial Microstructure of Al/Mg Bimetal Prepared by Lost Foam Casting

Zhang Zheng, Jiang Wenming, Li Guangyu, Guan Feng, Zhu Junwen, Yu Yang, Fan Zitian

(State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology)

Abstract:The lost foam casting(LFC) process was used to prepare the solid liquid compound of Al/Mg bimetal with a Ni coating on the surface of A536 aluminium alloy prepared by plasma spraying technology, and the effects of pouring temperature and Ni coating on interfacial microstructure of Al/Mg bimetal were investigated with the help of scanning electron microscopy and energy dispersive spectrometer. The results reveal that the interface layer thickness of the Al/Mg bimetal with Ni coating is less than that of one without a Ni coating under the same conditions, and the compositions of the interface layer of the Al/Mg bimetal with Ni coating are also different from that of one without Ni coating. The pouring temperature also has a prominent influence on the interfacial microstructure and compositions of the Al/Mg bimetal with Ni coating. The thickness of interface layer is increased with the increase of the pouring temperature, and a acceptable interfacial microstructure can be obtained at 730 ℃.

Key Words: Pouring Temperature, Ni Interlayer, Lost Foam Casting, Al/Mg Bimetal, Interfacial Microstructure