Microstructure,mechanical properties and corrosion resistance of as-cast and as-extruded Mg-4Zn-1La magnesium alloy  

作　　者：Huseyin Zengin Yunus Turen Hayrettin Ahlatci Yavuz Sun 

机构地区：[1]Department of Metallurgy and Materials Engineering,Karabuk University,78050 Karabuk,Turkey [2]Iron and Steel Institute,Karabuk University,78050 Karabuk,Turkey

出　　处：《Rare Metals》2020年第8期909-917,共9页稀有金属（英文版）

基　　金：financially supported by the Scientific Research Projects of Karabuk University(BAP)(No.KBUBAP-16/1-DR-075)。

摘　　要：Microstructure,mechanical properties and corrosion resistance of as-cast and as-extruded Mg-4 wt%Zn-1 wt%La magnesium alloys were investigated.The alloys were produced by low-pressure die casting method and extruded at 350℃after homogenization at 400℃for 24 h.The results show that the as-cast alloy mainly consists of primaryα-Mg matrix and Mg-Zn-La ternary second phases(also called T-Phase)along grain boundaries and isolated spherical particles inside the grains.After extrusion at350℃,the average grain size decreases by 81%due to dynamic recrystallization mechanism and T-phase particles are distributed along the extrusion direction.The elongation,yield strength and tensile strength of the as-cast Mg-4Zn-1La alloy increase by 179%,90%and 40%,respectively,as a result of the extrusion process.The as-extruded Mg-4Zn-1La alloy shows better corrosion resistance than the as-cast alloy due to increased grain boundaries and decreased content of T-phase.

关 键 词：Magnesium alloys La modification Extrusion MICROSTRUCTURE Mechanical properties Corrosion 

分 类 号：TG146.22[一般工业技术—材料科学与工程]