Interfacial microstructure characteristics and dynamic mechanical properties of TA2/AZ31B/2024Al explosively-welded composite plates

被引：0
|
作者：
Liang H. [1 ,2 ]
Luo N. [1 ,2 ]
Chen Y. [1 ,2 ]
Rui T. [3 ]
Pan Y. [3 ]
机构：
[1] State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Jiangsu, Xuzhou
[2] School of Mechanics and Civil Engineering, China University of Mining and Technology, Jiangsu, Xuzhou
[3] Anhui Baotai Special Materials Co., Ltd., Anhui, Xuancheng
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2024年 / 44卷 / 04期
关键词：
dynamic mechanical properties; explosive welding; interface microstructure; light metal; multilayer composite plate;
D O I：
10.11883/bzycj-2023-0367
中图分类号：
学科分类号：
摘要：
In recent years, with the rapid development of technology and equipment in the fields of aerospace, defense, and military industries, multilayer lightweight metal composite materials have attracted widespread attention to face complex service environments and reduce equipment weight. Titanium, aluminum, magnesium, and other lightweight metals and their alloys have advantages such as high specific strength, high specific elastic modulus, high damping and shock absorption, high electrostatic shielding, and high machinability, making them the most promising lightweight metal materials for application. In this study, the explosive welding experiments of TA2/AZ31B/2024Al multilayer light metal plate were carried out using a parallel explosive-welding process. Using scanning electron microscopy, electron backscatter diffraction, split Hopkinson pressure bar, and three-dimensional contour scanning, the interfacial microstructure characteristics, material phase changes, dynamic mechanical properties, and impact fracture characteristics of multilayer explosive welded composite plates were studied systematically. The results indicate that the four joining interfaces of the multilayer lightweight metal composite plate after welding present unique waveform structure characteristics of explosive welding, and there are no obvious defects at the joining interfaces. The overall welding quality is good. The grain refinement occurs at the joining interfaces and forms the fine grain region. The grain structure in the 1060Al transition layer exhibits typical elongated layered grain characteristics due to strong plastic deformation, and deformation texture and recrystallization texture characteristics appear at all four joining interfaces. The maximum dynamic compressive strength of the sample along the X-direction is 605 MPa, and the three-dimensional morphology of the fracture interface presents unique structural features similar to the water ripples. The maximum dynamic compressive strength of the sample along the Z-direction is 390 MPa, and the three-dimensional morphology of the fracture interface presents fibrous ductile fracture characteristics. Due to the different wave impedance of the metals, the delamination failure occurs in the X-direction sample, which is caused by the shear stress between the Al/Mg joining interfaces. Since the strength of 1060Al is lower than that of other metals, the Z-direction sample is first destroyed from the 1060Al layer, and slip shear fracture occurs along the 45° direction. © 2024 Explosion and Shock Waves. All rights reserved.
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