Cold Rolling Deformation Behavior and Interface Transition Layer Evolution of Cu-Be/Cu-Zn Laminated Composite
TANG Yanchuan1, XU Juwen1, CUI Zeyun1, WANG Wenhui1, ZHANG Xinlei1, TANG Xingchang2,3, ZHAO Longzhi1
1 School of Materials Science and Engineering, East China Jiaotong University, Nanchang 330013, China 2 State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 3 School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: After aging treatment, the ultimate tensile strength of high strength beryllium copper alloy can reach 1 400 MPa but the elongation is less than 5%. The significant strength and ductility trade-off presented in the beryllium copper alloy seriously affects the safety and reliability during the service. The local strain concentration which leads to the low plasticity can be suppressed by applying the laminated heterogeneous configuration design to the Cu-Be alloy. It is expected to acquire material with high strength-ductility through the preparation of Cu-Be/Cu-Zn laminated metal matrix composite. The preparation of laminated metal matrix composite through plastic deformation is easy to realize, which has caused widely concern. Previous researches of laminated metal matrix composite rolling deformation mainly focused on the deformation characteristics of metal components, but few works concerned the deformation characteristics of interface transition layers during rolling. In this work, we successfully prepared a Cu-Be/Cu-Zn laminated metal matrix composite by vacuum hot pressing and subsequent cold rolling. The cold rolling deformation behavior and interface transition layer evolution of Cu-Be/Cu-Zn laminated metal matrix composite were investigated by an optical microscope (OM), a field-emission scanning electron microscope (FE-SEM) with energy dispersion spectrum (EDS) and a Vic-kers hardness tester. The results show that the interfaces between the Cu-Be layers and Cu-Zn layers of the laminated metal matrix composite without cold rolling are of straight shape and the interface bonding is well, without cracks or voids. When the cold rolling reduction rate is less than 50%, inhomogeneous macroscopic deformation occurs in the composite. The deformation of Cu-Zn layers in the thickness direction is obviously larger than that of Cu-Be layers and transition layers. The thickness of transition layers is only reduced by 8.3% with the cold rolling reduction rate of 35%. The inhomogeneous plastic deformation changes the Cu-Be/Cu-Zn interfaces from straight to wavy. When the cold rolling reduction rate is above 65%, different layers of the laminated metal matrix composite deform uniformly and the thickness of the layers changes according to the cold rolling reduction rate. The transition layers possess the highest microhardness, followed by the Cu-Be layers and the Cu-Zn layers have the lowest microhardness in the case of the same cold rolling reduction rate. The high microhardness of the transition layers can be attributed to the significant shear stress state caused by coordinating the deformation of metal layers during the cold rolling of laminated metal matrix composite, which generates the extra back stress strengthening. In this work, the macroscopic deformation and strengthening mechanism of the transition layers in the Cu-Be/Cu-Zn laminated metal matrix composite during cold rolling is discussed, which contributes to better understanding of the plastic deformation characteristics and more reasonable formulating the processing during plastic forming of laminated metal matrix composite.
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2021, Vol. 35 
