A356覆层温度对AZ31/A356轧制复合板界面组织及力学性能的影响

doi:10.11896/cldb.18050096

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Abstract The present work aims to investigate the effects of A356 covering plate temperature on interfacial microstructure and mechanical properties of the cast-rolled Mg/Al composite plate. The results indicate that the interfacial transition zone of Mg/Al can be divided into three regions: region I is adjacent to Mg and may form Mg transition region (δ-Mg and Mg₁₇Al₁₂), region II is adjacent to Al and may form Al transition region (α-Al and Al₃Mg₂), region III is regarded as the diffusion interfacial intermediate region (Mg₁₇Al₁₂, Mg₂Si and Al₃Mg₂). The increasing temperature of the A356 covering plate results in a continuous rise of the width of the interfacial transition zone, and also the increment of type and volume fraction of the intermetallic compounds. Microhardness in the interfacial transition zone is higher than that of the matrix. It is easy to observe the phenomenon of brittle fracture along the brittle phase during the shear strength test. There occur cleavage fracture and quasi-cleavage fracture, both of which are brittle fracture, at AZ31 side and A356 side, respectively. The shear strength of the composite plate reaches its maximum value of 108 MPa when the temperature of the A356 covering plate is 640 ℃.

Key words： Mg/Al composite plate mechanical property interfacial transition zone intermetallic compound

Published: 19 June 2019

CLC number:

TG335.81

Fund:This work was financially supported by the National Natural Science Foundation of China (51464031) and Key R & D Projects in Gansu Province (17YF1GA021).

About author:: Shijie Yang, a master of engineering, is a third-year postgraduate in the school of Materials Science and Engineering, Lanzhou University of Technology. He is mainly focusing on the research of metal matrix compo-sites (layered metal composites).Yuandong Li, professor and doctoral supervisor of school of Materials Science and Engineering, Lanzhou University of Technology. He graduated from Gansu University of Technology with a M.S. degree in June, 2000 and received a PhD. degree in materials proces-sing engineering from Lanzhou University of Technology in 2005. Mainly engaged in the fields of casting aluminum alloy, magnesium alloy and semi-solid forming and its solidification behavior, self-inoculation casting, diffusion solidification, zinc-based alloy and its composites, deformation alloy
casting forming technology, surface modification and treatment. The concept and theory of self-inoculating solidification were put forward. Applied for 12 invention patents, and won 7 provincial and ministerial awards for science and technology. He has published more than 90 papers. SCI, EI included more than 40.

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	YANG Shijie
	LI Yuandong
	CAO Chi
	DONG Pengyuan
	LI Jiaming
	LI Ming

Cite this article:

YANG Shijie,LI Yuandong,CAO Chi, et al. Effect of A356 Covering Plate Temperature on the Microstructure and Mechanical Properties of AZ31/A356 Composite Plate Fabricated by Cast Roll Bonding[J]. Materials Reports, 2019, 33(14): 2397-2402.

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http://www.mater-rep.com/EN/10.11896/cldb.18050096 OR http://www.mater-rep.com/EN/Y2019/V33/I14/2397

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