钕对4004铝合金变质效果的影响
Effect of Nd on Modification of 4004 Aluminum Alloy
张春雨, 张治民, 张 星
点击：3121次 下载：0次
作者单位：(中北大学 材料科学与工程学院, 山西 太原 030051)
中文关键字：铝硅合金； 钕变质；力学性能
英文关键字：Al-Si alloy; Nd modification; mechanical properties
中文摘要：研究了在熔体温度为720 ℃保温时间为60 min时稀土钕加入量(0%、0.15%、0.30%、0.45%和0.60%)对4004铝合金变质效果的影响。结果表明：当钕加入量低于0.30%时，合金组织和力学性能都没有达到完全变质的状态；当钕加入量为0.30%时，4004铝合金变质效果最好，合金组织中的初晶铝转变为细小的圆状或短棒状，共晶硅也由片状或针状转变为纤维状，合金的抗拉强度达到最大值(197 MPa)，伸长率也达到最大值(4%)；当加入量超过0.30%时，随着加入量的增加，合金的组织开始变得粗大，抗拉强度和伸长率随之降低。
英文摘要：The effect of different amount of Nd (0%, 0.15%, 0.30%, 0.45% and 0.60%) on the modification of 4004 aluminum alloy was studied when the melt temperature was set at 720 ℃ and holding time was 60 min. The results show that, when the amount of Nd is less than 0.30%, the microstructure and mechanical properties of the alloy reach uncomplete modification; when Nd addition is 0.30%, the alloy reaches the best modification state, the primary aluminum transforms into small round or short rod-like, chip or needle-like eutectic silicon transforms into fibrous and the tensile strength reaches the maximum (197 MPa), the elongation also reaches the maximum (4%); when more than 0.30% Nd, with the increase of Nd addition, the microstructure of the alloy is coarsened, the tensile strength and elongation of the alloy reduce.