NDLI: Effects of Melt-to-Solid Insert Volume Ratio on the Microstructures and Mechanical Properties of Al/Mg Bimetallic Castings Produced by Lost Foam Casting

Content Provider	Springer Nature Link
Author	Jiang, Wenming Fan, Zitian Li, Guangyu Yang, Li Liu, Xinwang
Copyright Year	2016
Abstract	A356 aluminum and AZ91D magnesium alloys, which act as a solid insert and a melt, respectively, were used to prepare Al/Mg bimetallic castings using the lost-foam casting process, and the effects of the melt-to-solid volume ratio (VR) on the microstructures, mechanical properties, and fractographies of the Al/Mg bimetallic castings were investigated in this paper. Obtained results show that the average thickness of the reaction layer between aluminum and magnesium significantly increased with increasing VR, and a compact and uniform interface was obtained with a VR of 14.6. The reaction layers of all the bimetallic castings obtained by different VRs mainly consisted of the Al$_{12}$Mg$_{17}$ + δ eutectic layer close to the magnesium matrix, the Al$_{12}$Mg$_{17}$ + Mg$_{2}$Si intermediate layer as well as the Al$_{3}$Mg$_{2}$ + Mg$_{2}$Si layer next to the aluminum base. The microhardnesses of reaction layers of all the bimetallic castings with different VRs were considerably higher than those of the magnesium and aluminum matrix alloys, particularly the Al$_{3}$Mg$_{2}$ layer. Excessive thick reaction layer and pore defects remarkably weakened the bonding strength of the bimetallic castings, especially pore defects, and a relative maximum shear strength was obtained with a VR of 14.6. The fractographs of the push-out samples showed a change in the fracture surface from a mixed brittle and ductile fracture nature to that of a brittle fracture nature with the increase of VR.
Starting Page	6487
Ending Page	6497
Page Count	11
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	12
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-10-04
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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