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Effects of solution treatment on mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy 被引量:4

Effects of solution treatment on mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy
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摘要 Mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy after solution treatments were investigated by means of optical microscopy (OM), tensile test, hardness measurement and electrical conductivity test, differential scanning calorimetric (DSC), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and transition electron microscopy (TEM), respectively The results show that both tensile strength and hardness increase first and then decrease with temperature at constant holding time of 30 min with maximum strength and hardness appearing at 520 ℃. Tensile strength, hardness and elongation of samples treated at 520 ℃ for 30 min are 566 MPa (σb), 512 MPa (σ0.2), HB 148 and 8.23% (δ), respectively. There are certain amount of fine T1 (AI2CuLi) phase dispersing among AI substrates according to TEM images. This may result in mixed fracture morphology with trans-granular and inter-granular delamination cracks observed in SEM images. Mechanical properties and microstructures of Al-Li-Cu-Mg-Ag alloy after solution treatments were investigated by means of optical microscopy (OM), tensile test, hardness measurement and electrical conductivity test, differential scanning calorimetric (DSC), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and transition electron microscopy (TEM), respectively. The results show that both tensile strength and hardness increase first and then decrease with temperature at constant holding time of 30 min with maximum strength and hardness appearing at 520 ℃. Tensile strength, hardness and elongation of samples treated at 520 ℃ for 30 min are 566 MPa (σb ), 512 MPa (σ0.2 ), HB 148 and 8.23% (δ), respectively. There are certain amount of fine T1 (Al2 CuLi) phase dispersing among Al substrates according to TEM images. This may result in mixed fracture morphology with trans-granular and inter-granular delamination cracks observed in SEM images.
出处 《Journal of Central South University》 SCIE EI CAS 2013年第8期2083-2089,共7页 中南大学学报(英文版)
基金 Foundation item: Project(6140506) supported by GAD (General Armament Department), China
关键词 Al-Li-Cu-Mg-Ag alloy solution treatment microstructure mechanical properties 显微组织 机械性能 银合金 固溶处理 扫描电子显微镜 SEM图像 差示扫描量热法 硬度测量
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