Effect of surface morphology on bonding strength of Al/Mg hot rolled composite
5052 aluminum alloy and AZ31B magnesium alloy were selected as composites for hot rolled composite,and the effects of sur-face morphology on the bonding strength of Al/Mg hot rolled composite were studied.The surface of the plates was polished by wire brush with different diameters before hot rolled composite.The surface state and morphology of the plates after polishing were measured and ob-served by unidirectional tensile tests,scanning electron microscope and confocal laser scanning microscope.Then the Al/Mg composite plates were prepared though hot rolling composite method with reduction rates of 25％,35％and 45％.The bonding strength,microstruc-ture and element distribution of the composite plates were tested and observed by universal testing machine,scanning electron microscope and X-ray energy dispersive spectrometer.Finally,the surface morphology changes of Al/Mg hot rolled composite plates were observed by rolling stop experiment and peeling experiment under the condition of 45％reduction rate and with different diameters of wire brush.The results indicate that polishing treatment with different diameters of wire brush can only change the surface morphology of the plates,but not form the hard layer on the surface of the plates.With 25％and 35％reduction rates,the bonding strength of Al/Mg composite plates in-creases with the increase of wire brush diameter,but when the reduction rate reaches 45％,with the change of wire brush diameter,the bonding strength of Al/Mg composite plates is stable at about 71.2 MPa.By changing the surface morphology of the plates,aluminum al-loy and magnesium alloy can achieve good bonding with low reduction rate.However,when the reduction rate reaches 45％,there will not be an obvious effect on the bonding strength of the Al/Mg composite plates with the change of surface morphology of the plates.
Al/Mg composite platesurface morphologyhardened layerbonding strengthhot rolling
万方数据
维普
