Effect Of Different Processes On Properties And Microstructures Of6063Aluminum Alloy

Under different treatment processes,6063aluminum alloys were researched and compared its mechanical properties and microstructure, whose Mg/Si is1.44and Si is slightly excess. Temperature and time change in order to study its relevant hardness and microstructure. Microstructure changes of rolling process and homogenizing treatment of transformation processing were investigated. Furthermore, the influence of solid-solution air quench and then artificial aging were studied,and compared it with water quench. Thoroughly study the aging precipitates of6063alloy simultaneously. The above studies aim to research the strengthening mechanism of Al-Mg-Si aluminum alloys. And the research come to conclusions as follows:1)Reasonable homogenizing treatment of6063aluminum alloys were heating at560℃for8hours. Skeleton AlFeSi impurity phases distribute as latticed, which are cast structure and mainly exist in crystal boundary. During homogenizing treatment process, AlFeSi impurity phases change from hard and brittle skeleton P-AlFeSi to small spherical α-AlFeSi phase.2)The major texture of6063aluminum alloys after cold transformation processing are Brass{011}<211>、Goss{011}<100> and Copper{112}<111>.3)The of6063aluminum alloys after solid-solution(550℃/50min) and aging(175℃/8h) process, the tensile strength is221Mpa, and fracture strain is18%.4)The tensile strength of air-granulation is196MPa. During air quench of6063aluminum alloys, the precipitates from matrix are large Supersaturation of matrix solute elements decrease and go against precipitating strengthening phase during artificial ageing.5)The precipitating strengthening phase of6063aluminum alloys is β"(Mg5Si6), which feature structure is Si pillars,30-100nm in length,4nm in width, and extending in the Al matrix<100> direction.