热处理制度对6082-T6铝合金挤压棒材电导率与硬度的影响  

Effect of Heat Treatment System on Electrical Conductivity and Hardness of 6082-T6 Aluminium Alloy Extruded Rod

作　　者：周京辉 黄妙清 胡权 鲁炎卿 ZHOU Jinghui;HUANG Miaoqing;HU Quan;LU Yanqing(Foshan Sanshui Fenglu Aluminum Industry Co.,Ltd.,Foshan 528133,China)

机构地区：[1]佛山市三水凤铝铝业有限公司,广东佛山528133

出　　处：《铝加工》2024年第6期43-47,共5页Aluminium Fabrication

摘　　要：采用数显小负荷布氏硬度计HBS-62.5、数字金属电导率测量仪、扫描电子显微镜、数字材料显微镜等设备分析了6082铝合金挤压棒材在不同化学成分、均匀化制度、固溶温度及时效制度下的布氏硬度与电导率,结果表明:Fe与游离Si质量分数越低,均匀化温度越高,均匀化时间越长,棒材电导率越高;固溶温度越高,时效后电导率越低,硬度则越高。为得到最佳的综合性能,将Fe元素质量分数控制在0.15%以下,Si元素质量分数按国标下限控制,采用560℃×12 h的均匀化制度;控制固溶温度为520~540℃;然后时效,采用单级时效制度175℃×12 h能够使棒材的硬度达到100.8 HBW,电导率达到28.5 MS/m;采用170℃×2 h+220℃×1 h的双级时效制度时效后,棒材硬度达到100.2 HBW,电导率达到28.4 MS/m。双级时效制度是值得推荐的一种时效制度。The Brinell hardness and conductivity of 6082 aluminium alloy extruding bar were analyzed under different chemical composition,homogenization system,solution temperature and ageing system by using digital display small-load Brinell hardness tester HBS-62.5,digital metal conductivity tester,scanning electron microscope and digital material microscope.The results show that:The lower the element mass fraction of Fe and free Si,the higher the homogenization temperature,the longer the homogenization time and the higher the bar conductivity;The higher the solution temperature,the lower the conductivity and the higher the hardness after ageing.In order to obtain the best comprehensive performance,the Fe element mass fraction is controlled below 0.15%,the Si element mass fraction is controlled according to the lower limit of the national standard,and the homogenization process of 560 ℃×12 h is adopted.The solution temperature is controlled at 520~540 ℃.Then the ageing process is carried out.A single stage ageing system of 175 ℃×12 h can make the hardness of the bar reach 100.8 HBW and the conductivity reach 28.5 MS/m;the two stage ageing system of 170 ℃×2 h+220 ℃×1 h can make the hardness of the bar reach 100.2 HBW and the conductivity reach 28.4 MS/m.The two stage ageing system is a ageing system worth recommending.

关 键 词：晶格畸变 固溶处理 时效制度 布氏硬度 电导率 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG166.3[金属学及工艺—金属材料]