What is the appropriate rolling reduction rate of Mgi1Zn alloy aluminum plate?

In order to study the rolling reduction rate of Mgi1Zn alloy aluminum plate, the researchers studied the aluminum plate, and we also obtained the suitability of rolling reduction rate through related research. The specific research conclusions are as follows:

In the cold rolling composite experiment of MgLr1Zn alloy plate and aluminum plate, the results show that when the reduction ratio is less than 50%, the two plates can not be combined by rolling, because when the reduction ratio is small, the damaged area of oxide film on the surface of aluminum panel and MgJiLi-1Zn alloy is less, and the internal metal can not be squeezed out of the oxide film to form a firm bond. Increasing the rolling reduction rate, it is found that when the reduction rate is 509, Mgi1Zn alloy and aluminum panel are compounded, but the bonding strength is very low, and the shear strength of alloy aluminum plate is 10.23MPa. Therefore, the reduction rate of 50% can be considered as the critical reduction rate of cold rolling composite of Mg9r1Zn alloy and aluminum panel.

When the reduction rate is higher than 50%, the interface bonding state of the composite plate is obviously improved and the bonding strength speed is increased. Through experiments, Mgr1Zn alloy and aluminum panel have achieved a good composite, and the composite interface is flat and has no obvious defects.

After rolling, the A phase in Mgi-1Zm alloy is obviously elongated, showing a strip-like typical rolled structure. After rolling, there are no defects such as cracks in the alloy, and the alloy shows good plasticity during rolling and compounding. Because the surface layer of Mgir17n alloy is in contact with the aluminum panel during rolling, the friction generated at the interface can effectively weaken the stress concentration generated during rolling of a single alloy and avoid the appearance of surface cracks, which can obviously increase the plasticity of ME-9LI1Zm alloy.

It is found in the experiment that the rolling reduction ratio is not as high as possible when cold rolling is combined. When the reduction ratio exceeds 70%, obvious cracks appear at the edge of the aluminum alloy, which is due to the sharp relative strain rate of A in the close-packed hexagonal series of Mgi-1Zn alloy in the cold state. When the strain rate is too large, the slip system between products can not start in the deformation process, resulting in the plastic decline of the alloy and the formation of cracks.

Considering the factors such as interface bonding effect of dissimilar materials and rolling defects, it is confirmed by experiments that the rolling reduction ratio of Mgi1Zn alloy and aluminum panel is 50%-70%, and the better the bonding condition of composite plate is when the reduction ratio is 60%-65%6.

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