Effect of RE elements on the microstructural and mechanical properties of as-cast and age hardening processed Mg-4Al-2Sn alloy

作     者：Amir Mahyar Majd Mohammad Farzinfar Matin Pashakhanlou Mohammad Javad Nayyeri 

作者机构：Department of Materials EngineeringScience and Research BranchIslamic Azad University(IAU)TehranIran 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2018年第6卷第3期

页      面：309-317页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0801[工学-力学（可授工学、理学学位）] 

主　　题：Magnesium alloys Aging Rare earth elements Mechanical properties Microstructure 

摘      要：In the present article,the effect of Rare Earth elements on the microstructural development and mechanical properties of as cast and age treated Mg-4Al-2Sn(AT42)alloy is *** has been conducted by optical and scanning electron microscope,XRD and tensile *** of the data showed that alloy’s dendrites turn into larger dendritic structure with sharp and narrow arms from equiaxed rosette type by addition of RE *** contrast to the base alloy,aging treatment shows a positive effect on the mechanical properties(yield strength,tensile strength and elongation)of AT42+1RE alloy mainly because of retention of the thermally stable RE containing intermetallics as strong barriers to grain ***,increase of solute aluminum due to the decomposition of Mg 17 Al 12 along with saturated RE elements led to formation of blocky shape Al 2 RE in the microstructure during aging which enhanced the mechanical *** was found that the best result(yield of 70 MPa,tensile strength of 168 MPa and elongation of 14%)could be achieved by aging the AT42+1RE alloy at 443 K(170℃)for 8 ***,mechanical properties of AT42+1RE alloy starts to decrease after exceeding its optimum aging conditions due to the coarsening of intermetallics.