终轧温度对大应变轧制Al-Cu-Mg-Sc合金组织及性能的影响

采用显微组织分析、拉伸试验和XRD分析等方法,研究了不同终轧温度对大应变轧制Al-Cu-Mg-Sc合金显微组织及力学性能的影响。结果表明,Al-Cu-Mg-Sc合金中主要存在S相、θ相以及少量Al3Sc相,在不同温度下进行终轧时,显微组织均呈带状特征,且细小第二相粒子也明显沿轧制方向分布。终时效处理后,合金中析出大量细小弥散分布的第二相。终轧温度在200℃以下时,合金抗拉强度变化较小;经200℃终轧+150℃×4h终时效处理后,Al-Cu-Mg-Sc合金具有最佳的综合力学性能,抗拉强度、伸长率分别为622.85MPa和13.33%。

Effects of Final Rolling Temperature on Microstructure and Mechanical Properties of Large Strain Rolled Al-Cu-Mg-Sc Alloy

Effects of final rolling temperature on microstructure and mechanical properties of large strained Al-CuMg-Sc alloy were investigated by means of microstructure analysis,tensile test and XRD analysis.The results reveal that there are mainly Sphase,θphase and a small amount of Al3Sc phase in Al-Cu-Mg-Sc alloy.When final rolling at different temperatures,the microstructure presents banded structure and fine second phase particles are distributed along rolling direction.After the final aging treatment,a large amount of fine and dispersed second phase is precipitated in the alloy.When the finishing temperature is below 200℃,the yield strength change of the alloy can be ignored.After final rolling at 200℃+150℃×4 h,Al-Cu-Mg-Sc alloy has the desirable comprehensive mechanical properties,where the tensile strength and elongation reach 622.85 MPa and 13.33%,respectively.