铝合金中典型富Fe相在镁熔体中的演变行为研究  

Evolution Behaviors of Typical Fe-rich Phases of Al Alloy in Mg Melts

作　　者：苏宏福 刘敬彬 程汉明 张达成 韩梦霞 高通[1] 刘相法[1] SU Hongfu;LIU Jingbin;CHENG Hanming;ZHANG Dacheng;HAN Mengxia;GAO Tong;LIU Xiangfa(Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials,Ministry of Education,School of Material Science and Engineering,Shandong University,Jinan 250061;Nantong Hongjin Metal Aluminium Co.,Ltd.,Nantong 226300)

机构地区：[1]山东大学材料科学与工程学院,材料液固结构演变与加工教育部重点实验室,济南250061 [2]南通鸿劲金属铝业有限公司,南通226300

出　　处：《特种铸造及有色合金》2024年第12期1596-1602,共7页Special Casting & Nonferrous Alloys

基　　金：山东省自然科学基金面上项目(ZR2022ME005)。

摘　　要：通过向镁熔体中引入Al-2Fe-2Mn、Al-12Si-2Fe-2Mn和ADC12铝合金,并进行熔体保温和冷却,在铸锭底部获得了富Fe相沉淀层。利用扫描电镜和X射线衍射技术研究了富Fe金属间化合物在Mg熔体中的形貌和结构特点,发现沉淀层中的富Fe相相较于初始铝合金中均发生了结构转变,呈核-壳结构形态。Al-2Fe-2Mn合金中的Al6(Mn,Fe)相在镁熔体中演变成了Al(Fe,Mn)和Al_(5)(Fe,Mn)_(2);Al-12Si-2Fe-2Mn合金中的α-Al_(15)(Fe,Mn)3Si2相和ADC12铝合金中的β-Al_(5)Si(Fe,Mn)相均演变为Al_(5)(Fe,Mn)_(2)和(Fe,Mn)_(3)Al_(0.7)Si_(0.3)。相比初始铝合金,演变后合金富Fe相中Al含量显著降低,即该部分Al溶解于镁熔体,进而可被回收利用。Al-2Fe-2Mn,Al-12Si-2Fe-2Mn,and ADC12 alloys were introduced into Mg melts,followed with melt holding and cooling,and Fe-rich perticipate layers were obtained at the bottom of ingots.Morphologies and strucutre characteristics of Fe-rich phases in Mg melt were investigated by scanning electron microscopy and X-ray diffraction.The results reveal that the structure of Fe-rich phases is transformed,presenting core-shell morphologies.Al6(Mn,Fe)phase in Al-2Fe-2Mn alloy is evolved to Al(Fe,Mn)and Al_(5)(Fe,Mn)_(2)in the Mg melt,whereasα-Al_(15)(Fe,Mn)3 Si2 phase in Al-12Si-2Fe-2Mn alloy andβ-Al_(5)Si(Fe,Mn)in ADC12 alloy are both converted to Al_(5)(Fe,Mn)_(2)and(Fe,Mn)_(3)Al_(0.7)Si_(0.3)phases.Compared to the primary Al alloys,Al content is singificantly reduced in Fe-rich phases of evolved alloys,indicating the dissolution of Al into Mg melt,which can be gathered and reused.

关 键 词：铝合金 金属间化合物 相结构 镁熔体 

分 类 号：TG146.21[一般工业技术—材料科学与工程]