【摘要】 采用光学显微镜（OM）、扫描电镜（SEM）、透射电镜（TEM）、差热分析（DSC）和电子拉力试验机等研究了Al-2.5Cu-0.3Mg合金线材经不同温度固溶处理后的组织和性能。结果表明：冷拉拔态Al-2.5Cu-0.3Mg合金线材的晶粒沿变形方向拉长，组织内含有大量Al₂Cu相；经过495～510℃固溶处理后，组织发生完全再结晶；随着固溶温度的升高，Al₂Cu相逐渐回溶，DSC热焓值降低；经自然时效后组织内析出纳米级强化团簇，合金的抗拉强度、剪切强度和腐蚀性能逐渐提高；当固溶温度升高至510℃时，合金的剪切强度提高至257 MPa,点蚀深度降低至39μm。更多还原

【Abstract】 Microstructure and properties of Al-2.5Cu-0.3Mg alloy wire after solution treatment at different temperatures were studied using optical microscope（OM）, scanning electron microscopy（SEM）, transmission electron microscopy（TEM）, differential thermal analysis（DSC） and electronic tensile testing machine. The results show that the grains of the cold drawn Al-2.5Cu-0.3Mg alloy wire are elongated along the deformation direction, and there is a large amount of Al₂Cu phase in the microstructure. After solution treatment at 495-510 ℃, the microstructure undergoes complete recrystallization. As the solution treatment temperature increases, the Al₂Cu phase gradually dissolves, and the DSC enthalpy value decreases. After natural aging, nanoscale strengthening clusters precipitate within the microstructure, and the tensile strength, shear strength and corrosion performance of the alloy gradually increase. When the solution treatment temperature is increased to 510 ℃, the shear strength of the alloy increases to 257 MPa, and the pitting depth decreases to 39 μm.更多还原