Effect of different Ni interlayers on interfacial microstructure and bonding properties of Al/Mg bimetal using a novel compound casting. (February 2020)

• Record Type: Journal Article
• Authors: Li, Guangyu; Jiang, Wenming; Guan, Feng; Zhu, Junwen; Yu, Yang; Fan, Zitian
• Is Part Of: Journal of manufacturing processes. Volume 50(2020)
• Page Start: 614
• Page End: 628
• Publication Date: 2020-02
• Subjects: Al/Mg bimetal -- Ni interlayer -- Surface roughness -- Compound casting -- Microstructure -- Bonding properties; Production management -- Data processing -- Periodicals; Manufacturing processes -- Periodicals; Procestechnologie; Productietechniek; Production -- Gestion -- Informatique -- Périodiques; Fabrication -- Périodiques; Manufacturing processes; Production management -- Data processing; Periodicals; 670.5
• DOI: 10.1016/j.jmapro.2020.01.017
• Languages: English
• ISSNs: 1526-6125

Abstract

Highlights: Effect of different Ni interlayers on Al/Mg bimetal was studied. Plasma sprayed nickel (PSN) coating had a higher surface roughness. PSN coating improved wettability of insert and melt and interface reaction. Mg2 Ni layer was generated in the Al/Mg bimetal with PSN coating. Al/Mg bimetal with PSN coating obtained a superior bonding property. Abstract: In this work, the Al/Mg bimetal was manufactured using a novel lost foam compound casting (LFCC) process, and the effect of different Ni interlayers prepared by electronickelling (EN), electroless nickel plating (ENP) and plasma sprayed nickel (PSN) methods on the interfacial microstructure and bonding properties of the Al/Mg bimetal was systematically investigated. The surface roughness of the Al insert with PSN coating was much higher than those of the inserts with EN and ENP coatings, improving the wettability between the solid insert and liquid metal and enhancing the reaction of Ni and Mg. The interfaces of the Al/Mg bimetals with EN coating and ENP coating consisted of Ni solid solution layer, Al3 Ni layer and Al + Si + Al3 Ni layer, while one more Mg2 Ni layer was generated in the Al/Mg bimetal with PSN coating. The Al/Mg bimetal with PSN coating obtained a superior bonding property, which was 69 % higher than that of the Al/Mg bimetal without Ni coating. The fractures of the Al/Mg bimetals with EN and ENP coatings occurred in the mechanical joint zone of the Ni solid solution layer and Mg base, while the fracture of the Al/Mg bimetal with PSN coating passed through whole interface layer.