二级固溶制度对ZAl7Si4CuMg合金组织与性能影响  

Effects of two-step solution treatment on microstructure and mechanical properties of ZAl7Si4CuMg alloy

作　　者：李艳[1] 张文达[1] 杨晶[1] 党惊知[1] 刘云[1] 

机构地区：[1]中北大学材料科学与工程学院,山西太原030051

出　　处：《材料热处理学报》2013年第4期63-68,共6页Transactions of Materials and Heat Treatment

基　　金：兵器预研基金(62202070807);山西省科技攻关基金(20090321075)

摘　　要：采用洛氏硬度计、扫描电镜(SEM)和能谱技术(EDS)对经单级和二级固溶处理但未时效的ZAl7Si4CuMg合金试样性能和组织进行了实验研究。结果表明:在485℃单级固溶(0.5～16 h)处理下,固溶初始阶段硬度增加速度较快,当固溶时间8 h时,硬度达到峰值(29 HRB),同铸态试样硬度相比提高了100%;在相同固溶时间(4 h)下,535℃单级固溶处理下的试样硬度低于485℃单级固溶处理下的硬度;二级固溶处理制度(485℃×6 h+535℃×4 h)获得的试样硬度最高(31.6 HRB),分别比535℃×4 h单级固溶处理试样和485℃下单级固溶处理峰值硬度高出35%和8.6%。Influence of aging-free single-step and two-step solution treatments on microstrueture and mechanical properties of ZAI7Si4CuMg alloy was studied by hardness testing, scanning electron microscopy （SEM） and energy dispersive spectrometer （EDS） analysis. The results show that hardness of the tested alloy increases rapidly at the initial stage in the single-solution treatment （485 ℃× 16 h）, when the solution time is 6 h, the hardness reaches the peak value （29 HRB） , which increased by 100% compared with the hardness of as-cast speciment. The hardness of the alloy treated at 535 ℃ for 4 h is lower than that treated at 485 ℃ for 4 h. The sample by two-step solution treatment （485℃×6h＋535℃×4h） obtaines the highest hardness （31.6 HRB）, which is higher than the peak hardness of the sample treated by single-step solution （535℃× 4 h） and single-step solution at 485℃ for 8 h by 35% and 8.6% , respectively.

关 键 词：铝硅合金 固溶处理 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]