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https://doi.org/10.1007/s11837-020-04303-4  2020 The Minerals, Metals & Materials Society

INTERFACIAL STABILITY IN MULTI-COMPONENT SYSTEMS

Preparation of 2024-Al/AZ31-Mg Laminated Composite by Powder Metallurgy Integrated Forming and Sintering TAO WANG,1 YUFENG HUANG ,1,2 LUN YANG,1 YUNZHU MA,1,3 LEI WU,1 HUANYUAN YAN,1 YANG LIU,1 and WENSHENG LIU1 1.—National Key Laboratory of Science and Technology for National Defence on High-strength Structural Materials, Central South University, Changsha 410083, People’s Republic of China. 2.—e-mail: [email protected]. 3.—e-mail: [email protected]

Herein, an 2024-Al/AZ31-Mg laminated composite was prepared by hotpressing sintering using powder metallurgy integrated forming and sintering. Effects of sintering temperature on the microstructure and mechanical properties of the matrix and interface of Al/Mg laminated composites were investigated. The mechanisms of interface formation and evolution were obtained. The results indicate that with sintering temperature increases from 475C to 550C, the densification of the Al/Mg matrix gradually increases. Intermetallic compounds were generated at the interface, and their thickness increased from 56.4 lm to 195.1 lm. In addition, the interface structure was composed of an Al7Cu3Mg6, Al3Mg2 and Al12Mg17 layer. At a sintering temperature of 525C, the tensile strength and interface shear strength of Al/Mg laminated composites were 37.8 MPa and 31.13 MPa, respectively. The shear fracture occurred between the Al3Mg2 layer and Al12Mg17 layer and was a mixed cleavage and intergranular fracture.

INTRODUCTION In recent years, lightweight and high-strength structural materials have attracted extensive attention in aerospace and automobile manufacturing applications.1 Both aluminum and magnesium alloys are lightweight structural materials with high specific strength and stiffness, and their applications are increasing every year.2,3 The Al/ Mg laminated composite, which is prepared by combining two different materials, not only overcomes the limitations of various properties of a single material, but also considers the advantages of two materials. Therefore, the preparation of a Al/Mg laminated composite has become a topic of interest for researchers.4 Currently, there are several methods for preparation of laminated composite materials, such as the explosive composite,5 rolling composite,6 diffusion bonding7 and powder metallurgy method,8 etc. Zeng et al. fabricated AZ31B-Mg/1060-Al composite plates via explosive welding under a helium atmosphere and evaluated their micro-morphology, (Received April 28, 2020; accepted July 22, 2020)

element distribution and mechanical properties.9 Wang et al. prepared AZ31B-Mg/5052-Al laminates with excellent mechanical properties and good flatness by novel corrugated rolling and flat rolling. The microstructure evolution and mechanical behavior change of composite laminates under CFR hot rolling were studied by experiment and numerical simulation.10 Mofid et al. studied the microstructure evoluti