Research on microstructure and mechanical properties of Al-Cu-Sc aluminum alloy sheet under different heat treatment conditions
The microstructure of Al-Cu-Sc aluminum alloy sheet with thickness of 3 mm was analyzed with EBSD technique under the arti-ficial aging state(T6 state)and annealing state(O state).Moreover,uniaxial tensile tests were carried out at room temperature on the T6 state,O state and W state sheets,as well as T8 state sheet obtained by pre-tension deformation and artificial aging treatment,and the change laws of mechanical properties of the sheets under different heat treatment conditions were studied.The results show that the texture in the direction of[001]exists in both T6 state and O state sheets,and the texture in the O state sheet is stronger.The grain boundaries of the T6 state sheet are dominated by high angle grain boundaries,while the grain boundaries of the sheets in the O state are dominated by low angle grain boundaries,and the grain size is much larger than that of the T6 state sheet.The strength in rolling direction and trans-verse direction of the Al-Cu-Sc sheets in T6 state and W state is basically the same,while the strength in rolling direction of the O state sheet is obviously higher than that in the transverse direction.The O state sheet has the lowest strength,the T6 state sheet has the worst plasticity,and the W state sheet has the best formability with the smallest strength ratio and the largest strain hardening exponent n value.In addition,the strength of the T8 state sheet obtained after pre-tension and artificial aging is significantly increased.When the pre-ten-sion deformation is 5%and 7%,the tensile strength of the T8 state sheet is higher than 500 MPa.
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