Sc对6061合金组织与性能的影响
Effect of Sc on Microstructure and Properties of 6061 Alloy
钟明 1赖昀昊 1古文丽 1马乾康 1邓同生1
作者信息
- 1. 江西理工大学材料冶金化学学部,赣州 341000
- 折叠
摘要
通过添加Sc对6061铝合金组织及性能进行改性.通过真空感应熔炼制备了6061和6061-0.2Sc铸锭并经550℃ ×12 h均匀化退火,随后进行了热挤压变形和570℃ ×1 h水淬+175℃ ×5 h空冷的固溶时效热处理,研究挤压变形前后Sc微合金化铝合金挤压型材的组织与性能演变.结果表明,Sc具有晶粒细化效应,均匀化后6061-0.2Sc晶粒尺寸为20～50 μm.挤压并经固溶时效热处理后6061-0.2Sc晶粒相比于6061更细小均匀.添加Sc后,合金的抗拉强度和伸长率均得到提升,宏观断口平整,拉伸断裂模式由韧脆性混合断裂转为韧性断裂,腐蚀电流密度由946.62 μA/cm2下降为568.05 μA/cm2,耐腐蚀性能显著提高.
Abstract
The microstructure and properties of 6061 aluminum alloy were modified by adding Sc.6061 and 6061-0.2Sc ingots were prepared by vacuum induction melting and homogenized and annealed at 550℃ ×12 h,followed by hot extrusion deformation and solution aging heat treatment of 570℃ ×1 h water quenching +175℃ ×5 h air cooling.The microstructure and properties of Sc microalloyed aluminum alloy sheet before and after extrusion were invstigated.The results indicate that Sc has grain refinement effect,and the grain size of 6061-0.2Sc is 20～50 μm after homogeni-zation.The grain size of 6061-0.2Sc after extrusion and solution aging heat treatment is finer and more uniform than that of 6061 alloy.After Sc addition,the tensile strength and elongation of the alloy are improved,and the macro frac-ture is smooth,and the tensile fracture mode is converted from tough-brittle mixed fracture to ductile fracture.Mean-while,the corrosion current density is decreased from 946.62 μA/cm2 to 568.05 μA/cm2,indicating the significant enhancment of corrosion resistance.
关键词
铝合金/稀土/挤压变形/力学性能/耐腐蚀性能Key words
Aluminum Alloy/Rare Earth/Extrusion Deformation/Mechanical Properties/Corrosion Resistance引用本文复制引用
基金项目
江西省大学生创新创业训练计划资助项目(S202110407012)
江西省大学生创新创业训练计划资助项目(S202210407008)
出版年
2024
NETL
NSTL
维普
万方数据