时效处理对6056铝合金力学性能和晶间腐蚀性能的影响  

Effect of Ageing Treatment on Mechanical Properties and Intergranular Corrosion Property of 6056 Aluminium Alloy

作　　者：余巨攀 马韬 索有喜 马鸿彬 林顺岩 YU Jupan;MA Tao;SUO Youxi;MA Hongbin;LIN Shunyan(Dongguan Runhua Aluminum Co.,Ltd.,Dongguan 523430;Yuantai High Conductivity Materials(Shanxi)Co.,Ltd.,Luliang 035300,China)

机构地区：[1]东莞市润华铝业有限公司,广东东莞523430 [2]元泰高导材料(山西)有限公司,山西吕梁035300

出　　处：《铝加工》2024年第3期29-35,共7页Aluminium Fabrication

摘　　要：采用拉伸试验、晶间腐蚀试验和金相观察等方法,考察了不同时效工艺对6056合金力学性能和晶间腐蚀性能的影响。结果表明:采用165℃×10 h的T6峰值时效,合金抗拉强度和屈服强度分别为438 MPa和380 MPa,延伸率为16.5%,但晶间腐蚀严重,腐蚀深度约为170μm。在T6峰值时效的基础上进行二级时效,合金强度逐渐降低,腐蚀深度明显变浅。对6056铝合金,较好的双级时效工艺为165℃×10 h+220℃×5 h,此时抗拉强度为405 MPa,屈服强度为375 MPa,延伸率为11.3%,腐蚀为轻微点蚀。采用140℃×6 h+180℃×5 h+140℃×4 h三级时效工艺,可获得更高的力学性能和较好的晶间腐蚀性能,其抗拉强度为455 MPa,屈服强度为425 MPa,延伸率为12.0%,晶间腐蚀深度约为12μm。The effects of different aging treatment on the mechanical properties and intergranular corrosion property of 6056 alloy were investigated by tensile test,intergranular corrosion test and metallographic observation.The results show that at T6 peak ageing(165℃×10 h),the tensile strength and yield strength are 438 MPa and 380 MPa respectively,and the elongation is 16.5%,but the in⁃tergranular corrosion is serious with a corrosion depth of about 170μm.After two-step ageing based on T6 peak aging,the alloy strength gradually decreases and the corrosion depth becomes significantly smaller.For 6056 aluminium alloy,the best two-stage age⁃ing process is 165℃×10 h+220℃×5 h.At this ageing system,the tensile strength is 405 MPa,the yield strength is 375 MPa,the elon⁃gation is 11.3%,and the corrosion is slight pitting.Higher mechanical properties and good intergranular corrosion property can be ob⁃tained by 140℃×6 h+180℃×5 h+140℃×4 h three-stage ageing process.At this ageing system,the tensile strength is 455 MPa,the yield strength is 425 MPa,the elongation is 12.0%,and the intergranular corrosion depth is about 12μm.

关 键 词：6056铝合金 时效 停放效应 晶间腐蚀性能 

分 类 号：TG166.3[金属学及工艺—热处理] TG146.21[金属学及工艺—金属学]