To study the microstructure evolution and indentation behavior of aluminum alloy,AA6063 aluminum alloy plate was prepared by cold rolling method at room temperature.The microstructure and local mechanical properties of AA6063 aluminum alloy plate were analyzed by metallography optical microscopy,scanning electron microscopy and microindentation.The results show that the grains of AA6061 aluminum alloy are elongated along the rolling direction and the work hardening is obvious after rolling at room temperature.With the increase of plastic deformation,the diagonal length,maximum indentation depth and residual indentation depth decrease under the same indentation load.The Vickers hardness of AA6063 aluminum alloy increases with the increase of plastic deformation,and the relationship between the hardness and plastic strain is exponential.With the increase of rolling deformation,the dislocation density of aluminum alloy specimen increases during indentation deformation.For aluminum alloy with the same deformation,the dislocation density gradually decreases and eventually tends to a stable value with the gradual increase of the maximum indentation load.Both the Vickers hardness and dislocation density of AA6063 aluminum alloy increase with the increase of reduction in thickness.As a result,the indenter resistance increases and plastic energy dissipated decreases after plastic deformation for AA6063 aluminum alloy.Dislocation slip is the main plastic deformation motion for AA6063 aluminum alloy.
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