固溶前预退火处理对6111铝合金组织与性能的影响

Influence of pre-annealing before solution on microstructure and properties of 6111 aluminum alloy

系统研究了固溶前预退火温度对6111铝合金冷轧板和T4P态组织和力学性能的影响。测试了力学性能,计算了LDR值;表征了显微组织、SEM组织和XRD织构构成。结果表明:预退火温度对6111铝合金的屈服强度影响较小;经300℃×2 h预退火处理后,抗拉强度发生明显降低,由245 MPa降低到230 MPa;当预退火温度高于100℃后,伸长率呈直线下降。n值和r值均随预退火温度先升高后降低,n值在200℃时达到最大值0.289,r值在100℃时达到最大值0.958。200℃×2 h预退火处理后,LDR值达到最大值2.005。经300℃×2 h预退火处理后,T4P态基体晶粒尺寸明显长大,在60~150μm范围。200℃×2 h预退火处理试样,T4P态Cube织构体积分数最高,达到了13.5%。

Influence of pre-annealing before solution treatment on microstructure and mechanical properties of cold rolled and T4P state 6111 aluminum was investigated.The mechanical properties were tested,the LDR value was calculated,and microstructure was characterized by means of optical microscopy and scanning electronic microscopy(SEM).The texture was tested by using XRD.The results indicate that preannealing temperature has little effect on yield strength,but the tensile strength decreases from 245 MPa to 230 MPa after annealing at 300℃for 2 h.The elongation decreases sharply when pre-annealing temperature is higher than 100℃.The n and r value increase first and then decrease with the increase of pre-annealing temperature.n value reaches the peak(0.289)at 200℃and r value reaches the peak(0.958)at 100℃.LDR value reaches the peak value of 2.005 after 200℃×2 h pre-annealing.The grain size of T4P state alloy after preannealing at 300℃for 2 h ranges from 60μm to 150μm.The volume fraction of Cube texture of T4P state alloy after pre-annealing at 200℃for 2 h reaches the peak value of 13.5%.