作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院

出　　处： 《材料热处理学报》 2011年第1期77-81,共5页

摘　　要： 采用力学性能、硬度、电导率测试和电子显微分析技术,研究了固溶-时效处理对6082铝合金挤压棒材组织与性能的影响。结果表明,6082挤压态合金组织除固溶体基体外,还包括微米级的含Cr和Mn的短棒状相、亚微米级的Mg2Si平衡相和α-(AlMnFeSi)夹杂相;固溶过程中亚微米级的Mg2Si平衡相溶解,微米级的含Cr和Mn的短棒状相和α-(AlMnFeSi)夹杂相仍然保留下来,时效过程中过饱和固溶体分解析出主要强化相β″相。合金棒材适宜的固溶-时效制度为545℃×50 min固溶水淬,170℃×8 h时效,在此条件下,合金棒材的抗拉强度、屈服强度和伸长率分别为367 MPa、341 MPa和14.1%。 Effect of solution and aging treatment on microstructure and mechanical properties of hot extruded 6082 aluminum alloy bars were studied by means of optical microsope,SEM,TEM,tensile tests,hardness and electric conductivity measurement.The results show that the main phases in the extruded 6082 alloy are Mg2 Si,the phase containing Cr and Mn and α-（AlMnFeSi） inclusion.The equilibrium Mg2 Si phase disappears while the phases containing Cr and Mn and the α-（AlMnFeSi） particles remain in the alloy after solution treatment.During aging the superstaturated solid solution decomposes and the main strengthening phases β″ precipitates.The appropriate heat-treatment regime of 6082 aluminum alloy bars is solution-treated at 545 ℃ for 50 min,quenched and then aged at 170 ℃ for 8 h.Tensile strength,yield strenth and elongation of the alloy after heat treatment are 367 MPa,341 MPa and 14.1%,respectively.

关 键 词： 合金 固溶 时效 组织性能 电导率

领　　域： [金属学及工艺] [一般工业技术] [金属学及工艺]