Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process

Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process

A novel technique combining solid−liquid 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 whic...

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Main Authors: Ke He, Jianhua Zhao, Jun Cheng, Jingjing Shangguan, Fulin Wen, Yajun Wang
Format: Article
Language:English
Published: MDPI AG 2019-10-01
Series:Materials
Subjects:
solid–liquid compound casting
arc spraying
interface
microstructure
intermetallic compound
mechanical property
Online Access:https://www.mdpi.com/1996-1944/12/19/3273
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spelling doaj-6307d8898a0f4626b8379b2433fbf3a42020-11-24T22:08:49ZengMDPI AGMaterials1996-19442019-10-011219327310.3390/ma12193273ma12193273Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting ProcessKe He0Jianhua Zhao1Jun Cheng2Jingjing Shangguan3Fulin Wen4Yajun Wang5College of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaCollege of Materials Science and Engineering, Chongqing University, Chongqing 400044, ChinaA novel technique combining solid&#8722;liquid 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 (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) and (<i>&#945;</i>-Al + Mg<sub>32</sub>(Al, Zn)<sub>49</sub>) structures, and the other primarily consisted of (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>), (MgZn<sub>2</sub> (main) + &#946;-Zn), and (&#946;-Zn (main) + MgZn<sub>2</sub>) structures. In the interface zone, the (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) structure was the most abundant structure, and the MgZn<sub>2</sub> 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 (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) structure and presented some typical features of brittle fracture.https://www.mdpi.com/1996-1944/12/19/3273solid–liquid compound castingarc sprayinginterfacemicrostructureintermetallic compoundmechanical property
collection DOAJ
language English
format Article
sources DOAJ
author Ke He
Jianhua Zhao
Jun Cheng
Jingjing Shangguan
Fulin Wen
Yajun Wang
spellingShingle Ke He
Jianhua Zhao
Jun Cheng
Jingjing Shangguan
Fulin Wen
Yajun Wang
Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
Materials
solid–liquid compound casting
arc spraying
interface
microstructure
intermetallic compound
mechanical property
author_facet Ke He
Jianhua Zhao
Jun Cheng
Jingjing Shangguan
Fulin Wen
Yajun Wang
author_sort Ke He
title Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
title_short Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
title_full Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
title_fullStr Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
title_full_unstemmed Influence of a Zn Interlayer on the Interfacial Microstructures and Mechanical Properties of Arc-Sprayed Al/AZ91D Bimetals Manufactured by the Solid–Liquid Compound Casting Process
title_sort influence of a zn interlayer on the interfacial microstructures and mechanical properties of arc-sprayed al/az91d bimetals manufactured by the solid–liquid compound casting process
publisher MDPI AG
series Materials
issn 1996-1944
publishDate 2019-10-01
description A novel technique combining solid&#8722;liquid 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 (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) and (<i>&#945;</i>-Al + Mg<sub>32</sub>(Al, Zn)<sub>49</sub>) structures, and the other primarily consisted of (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>), (MgZn<sub>2</sub> (main) + &#946;-Zn), and (&#946;-Zn (main) + MgZn<sub>2</sub>) structures. In the interface zone, the (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) structure was the most abundant structure, and the MgZn<sub>2</sub> 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 (<i>&#945;</i>-Mg + Al<sub>5</sub>Mg<sub>11</sub>Zn<sub>4</sub>) structure and presented some typical features of brittle fracture.
topic solid–liquid compound casting
arc spraying
interface
microstructure
intermetallic compound
mechanical property
url https://www.mdpi.com/1996-1944/12/19/3273
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AT jianhuazhao influenceofazninterlayerontheinterfacialmicrostructuresandmechanicalpropertiesofarcsprayedalaz91dbimetalsmanufacturedbythesolidliquidcompoundcastingprocess
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