Effect of 0.2％Er on microstructure and properties of Al-6.5％Cu alloy
Rare earth microalloying is one of the important means to improve the properties of aluminum alloy.In order to study the specific effects of rare earth element Er on the alloy,scanning electron microscopy(SEM),differential scanning calorimetry(DSC),electron back scattering diffraction(EBSD),transmission electron microscopy(TEM)and hardness testing methods were used.The optimization mechanism of 0.2％Er on the properties of Al-6.5％Cu alloy was studied.The results show that the introduction of Er element reduces the original grain orientation and the texture strength of the alloy is significantly reduced,which is helpful to improve the ductility and toughness of the alloy.At the same time,Er element promotes grain refine-ment,and the grain size decreased from 60.10 μm to 23.8 μm.The prismatic Al3Er particles were observed to inhibit the dislocation in TEM tests,and the uniform distribution of fine dispersed phase in the alloy matrix was also observed,which can promote the precipitation of the strengthened phase during aging.After adding Er element,the hardness of the alloy in different states is also increased.
Er elementAl-Cu alloylarge deformationsolution aging
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