Properties and Microstructure of Al-Cu-Mn Heat-resistant Alloy at High Temperature
The mechanical properties of an Al-Cu-Mn heat-resistant cast aluminum alloy at room temperature,250℃,300℃ and after stabilization treatments under different temperatures as well as microstructure under different heat-treated states were investigated.The results indicate that the tensile strength of alloy is decreased and the elonga-tion is increased with the increase of test temperature or stabilization treatment temperature.The tensile strength reaches the minimum after stabilization at 300℃ for 100 h,which also reaches over 200 MPa.The main strengthening phases of alloy are θ phase,S phase and T phase.After high temperature stabilization treatment,the morphologies of θ and T phase are coarsened,resulting in a decrease in strength of alloy.
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