%0 Journal Article
%T Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid¨CLiquid Compound Casting Process
%J Materials | An Open Access Journal from MDPI
%D 2019
%R https://doi.org/10.3390/ma12193273
%X A novel technique combining solid¨Cliquid compound casting (SLCC) with arc spraying was designed to manufacture the arc-sprayed Al/AZ91D bimetals with a Zn interlayer. The Al/Mg bimetal was produced by pouring the AZ91D melt into the molds sprayed with Al/Zn double-deck coating, during which the arc-sprayed Zn coating acted as the interlayer. The effect of the Zn interlayer on microstructures, properties, and fracture behaviors of arc-sprayed Al/AZ91D bimetals by SLCC was investigated and discussed in this study. The optimal process parameter was acquired by analyzing the results from different combinations between the arc-spraying time of the Zn coating (10, 18, and 30 s) and the preheat time of the Al/Zn double-deck coating (6 and 12 h). The interfacial microstructures of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer could be approximately divided into two categories: One was mainly composed of ( ¦Á-Mg + Al 5Mg 11Zn 4) and ( ¦Á-Al + Mg 32(Al, Zn) 49) structures, and the other primarily consisted of ( ¦Á-Mg + Al 5Mg 11Zn 4), (MgZn 2 (main) + ¦Â-Zn), and (¦Â-Zn (main) + MgZn 2) structures. In the interface zone, the ( ¦Á-Mg + Al 5Mg 11Zn 4) structure was the most abundant structure, and the MgZn 2 intermetallic compound had the highest microhardness of 327 HV. When the arc-spraying time of the Zn coating was 30 s and the preheat time of the Al/Zn double-deck coating was 6 h, the shear strength of the arc-sprayed Al/AZ91D bimetal reached 31.73 MPa. Most rupture of the arc-sprayed Al/AZ91D bimetals with a Zn interlayer occurred at the ( ¦Á-Mg + Al 5Mg 11Zn 4) structure and presented some typical features of brittle fracture. View Full-Tex
%U https://www.mdpi.com/1996-1944/12/19/3273