Al-Si-Mn系合金Mn致细化“中毒”效应的研究  

Mn-induced Refining Poisoning Effect in Al-Si-Mn Alloys

作　　者：段宏 陈彦宏 刘桂亮 王维裔 韩梦霞 孙谦谦[1,3] 蔡增辉 王志伟 刘相法 DUAN Hong;CHEN Yanhong;LIU Guiliang;WANG Weiyi;HAN Mengxia;SUN Qianqian;CAI Zenghui;WANG Zhiwei;LIU Xiangfa(Key Laboratory for Liquid‒Solid Structural Evolution and Processing of Materials,Ministry of Education,Shan-dong University,Jinan 250061;AECC Harbin Dong'an Engine Co.,Ltd.,Harbin 150066;Shandong Al&Mg Melt Technology Co.,Ltd.,Jinan 250061)

机构地区：[1]山东大学材料液固结构演变与加工教育部重点实验室,济南250061 [2]中国航发哈尔滨东安发动机有限公司,哈尔滨150066 [3]山东吕美熔体技术有限公司,济南250061

出　　处：《特种铸造及有色合金》2024年第12期1616-1625,共10页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(U2241230)。

摘　　要：随着再生铝用量逐渐增加,用于改善Fe相形貌的Mn元素在铝合金中的重要性愈加凸显。然而,向Al-Si-Mn合金中加入Al-Ti-B中间合金时,存在Mn致细化“中毒”现象,且“中毒”程度随Mn(或Si)含量的增加而逐渐加深。利用光学显微镜、扫描电镜、Pandat软件等手段,研究了Mn致细化“中毒”机理。结果表明,ASM系合金中Mn含量较高时,凝固初晶相为Al15FeMn3Si2,该相包覆了游离在铝合金熔体中的钛化物粒子,使之失去形核衬底作用,从而导致细化“中毒”。提出添加少量Ti调控ASM系合金中初生相和辅助Al-Ti-C-B(Al-TCB)晶种合金来有效缓解Mn致细化“中毒”的新工艺。With the gradual increase in amount of recycled aluminum,Mn element,which is used to improve the morphology of Fe phase,plays an increasingly important role in aluminum alloys.However,Mn-induced refining poisoning effect occurs in Al-Si-Mn(ASM)alloys with Al-Ti-B alloy addition,of which the degree deepens with the increase of Mn(or Si)content.The mechanism of Mn poisoning was revealed by means of optical microscopy,scanning electron microscopy and Pandat software.The results indicate that the primary solidification phase of Al15 FeMn3 Si2 is observed with higher Mn content in ASM alloys,which covers the free titanium particles in the aluminum alloy melt,leading to the miss of nucleation substrate and resulting in the poisoning phenomenon.A new process was proposed to regulate the primary phase in ASM alloys with a small amount of Ti with assistance of Al-Ti-C-B(Al-TCB)seed alloy to effectively alleviate Mn-induced refining poisoning.

关 键 词：Al-Si-Mn系合金 Al-TCB晶种合金 晶粒细化 Mn致细化“中毒” 

分 类 号：TG292[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]