Influence of high pressure and manganese addition on Fe-rich phases and mechanical properties of hypereutectic Al-Si alloy with rheo-squeeze casting  

高压和锰添加对流变挤压成形过共晶Al-Si合金富铁相和力学性能的影响（英文）

作　　者：Chong LIN Shu-sen WU Shu-lin Lü He-bao WU Han-xin CHEN 林冲;吴树森;吕书林;吴和保;陈汉新(武汉工程大学化工装备强化与本质安全湖北省重点实验室,武汉430205;华中科技大学材料成形与模具技术国家重点实验室,武汉430074)

机构地区：[1]Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety,Wuhan Institute of Technology,Wuhan 430205,China [2]State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Transactions of Nonferrous Metals Society of China》2019年第2期253-262,共10页中国有色金属学报（英文版）

基　　金：Project(51605342) supported by the National Natural Science Foundation of China;Project(2015CFB431) supported by the Natural Science Foundation of Hubei Province,China;Project(K201520) supported by the Science Research Foundation of Wuhan Institute of Technology,China;Project(2016KA01) supported by the Open Research Fund Program of Hubei Provincial Key Laboratory of Chemical Equipment Intensification and Intrinsic Safety,China

摘　　要：The influence of high pressure and manganese addition on Fe-rich phases(FRPs)and mechanical properties of Al-14Si-2Fe alloy with rheo-squeeze casting(RSC)was investigated.The semi-solid alloy melt was treated by ultrasonic vibration(UV)firstly,and then formed by squeeze casting(SC).Results show that the FRPs in as-cast SC alloys are composed of coarseβ-Al5(Fe,Mn)Si,δ-Al4(Fe,Mn)Si2 and bone-shapedα-Al15(Fe,Mn)3Si2 phases when the pressure is 0 MPa.With RSC process,the FRPs are first refined by UV,and then the solidification under pressure further causes the grains to become smaller.The peritectic transformation occurs during the formation ofαphase.For the alloy with the same composition,the ultimate tensile strength(UTS)of RSC sample is higher than that of the SC sample.With the same forming process,the UTS of Al-14Si-2Fe-0.8Mn alloy is higher than that of Al-14Si-2Fe-0.4Mn alloy.研究高压和锰添加对流变挤压成形Al-14Si-2Fe合金富铁相和力学性能的影响。首先,将半固态合金熔体进行超声振动处理,然后挤压成形。结果显示,当挤压力为0 MPa时,无超声挤压成形的Al-14Si-2Fe-(0.4,0.8)Mn合金铸态组织中的富铁相主要由粗大β-Al_5(Fe,Mn)Si相、δ-Al_4(Fe,Mn)_3Si_2相和骨骼状α-Al_(15)(Fe,Mn)3Si_2相组成。在流变挤压成形下,富铁相首先被超声振动细化,然后压力下的凝固使其尺寸进一步减小。在α相的形成过程中发生包晶反应。当合金成分相同时,流变挤压成形试样比无超声挤压成形试样的抗拉强度高;当成形工艺相同时,Al-14Si-2Fe-0.8Mn合金比Al-14Si-2Fe-0.4Mn合金的抗拉强度高。

关 键 词：high pressure MANGANESE rheo-squeeze casting hypereutectic Al-Si alloy Fe-rich phases mechanical properties 

分 类 号：TG379[金属学及工艺—金属压力加工] TG146.21[一般工业技术—材料科学与工程]