永磁场对金合金二次枝晶臂间距和析出相的影响  

Effects of Permanent Magnetic Field on Secondary Dendrite Arm Spacing and Precipitate Phase of Gold Alloy

作　　者：张俊凯[1,2] 厉英 Zhang Junkai;Li Ying(Northeastern University,Shenyang 110819,China;Liaoning Key Laboratory for Metallurgical Sensor and Technology,Shenyang 110819,China)

机构地区：[1]东北大学,辽宁沈阳110819 [2]辽宁省冶金传感器及技术重点实验室,辽宁沈阳110819

出　　处：《稀有金属材料与工程》2018年第9期2857-2860,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51274057;51474057)

摘　　要：将旋转永磁场应用于金合金的制备过程中,研究不同转速永磁场对金合金二次枝晶臂间距和析出相的影响规律,同时探讨其机理。结果表明:旋转永磁场可以使金合金凝固组织明显细化,显著降低了合金的二次枝晶臂间距,但过高的永磁体转速使合金熔体的集肤效应显著增大,减小了永磁场的作用范围,使熔体心部磁感应强度减小,二次枝晶臂间距反而增大。对金合金施加永磁搅拌提高了枝晶间富金相的面积分数,转速300 r/min时金合金富金相含量最多,为5.07%,比未施加永磁搅拌的金合金高出近59.4%。The permanent magnetic field was applied to prepare gold alloy and the influences of permanent magnetic field on secondary dendrite arm spacing and precipitate of gold alloy were discussed.The results show that the rotating magnetic field remarkably refines the microstructure and reduces secondary dendrite arm space of the gold alloy.However,a too high rotating speed can increase the skin effect of the molten metal and lower the magnetic flux density of the centre,thereby increasing secondary dendrite arm space.The area percent of α2 can be increased by the rotating magnetic field.At 300 r/min,the gold alloy has the highest area percent of α2,which is 59.4% higher than that without permanent magnetic field.

关 键 词：永磁场 析出相 金合金 二次枝晶臂间距 

分 类 号：TG146.3[一般工业技术—材料科学与工程]