Effect of Heat Treatment System on Electrical Conductivity and Hardness of 6082-T6 Aluminium Alloy Extruded Rod
The Brinell hardness and conductivity of 6082 aluminium alloy extruding bar were analyzed under different chemical com-position,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 ele-ment 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 sys-tem 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.
万方数据
维普
