Chemical and mechanical properties of stainless, environment-friendly, and nonflammable Mg alloys (SEN alloys): A review  

作　　者：Jong Un Lee Hyun Ji Kim Sang-Cheol Jin Ye Jin Kim Young Min Kim Bong Sun You Jun Ho Bae Sung Hyuk Park 

机构地区：[1]Advanced Metals Division,Korea Institute of Materials Science,Changwon 51508,Republic of Korea [2]Department of Materials Science and Metallurgical Engineering,Kyungpook National University,Daegu 41566,Republic of Korea [3]Missile Research Institute,Agency for Defense Development,Daejeon 34060,Republic of Korea

出　　处：《Journal of Magnesium and Alloys》2024年第3期841-872,共32页镁合金学报（英文）

基　　金：supported by the Materials and Components Technology Development Program(No.20024843);funded by the Ministry of Trade,Industry&Energy(MOTIE,South Korea);by the National Research Council of Science&Technology(NST)grant(No.CRC23011-000)funded by the Korea government(MSIT).

摘　　要：This review article provides overall understanding of stainless,environment-friendly,and nonflammable Mg alloys(SEN alloys)recently developed at the Korea Institute of Materials Science.SEN alloys are produced by adding small amounts of Ca and Y(each<1 wt%)into commercial Mg–Al based alloys,resulting in exceptional ignition and corrosion resistances and impressive mechanical properties.Their main advantages of SEN alloys are as follows.(1)A dense multi-oxide layer of SEN alloys comprising MgO,CaO,and Y_(2)O_(3) impedes the outward dispersion of Mg vapor and the inward penetration of O_(2) during oxidation,thereby enhancing the oxidation and ignition resistances.(2)The presence of Ca-and Y-based second-phase particles in SEN alloys can enhance their corrosion resistance because Ca-containing particles prevent the spread of corrosion,and the replacement of Al-containing particles with less noble ones containing Y(e.g.,Al–Mn–Y or Al–Y particles)retards corrosion.(3)The addition of minor amounts of Ca and Y renders excellent mechanical properties due to improved strengthening effects.These enhanced properties are attributed to more pronounced dynamic recrystallization and grain refining behaviors caused by the second-phase particles during extrusion.(4)Despite the presence of various types of second-phase particles,the fatigue properties of SEN9 alloys are similar to those of commercial AZ91 alloys.(5)Simultaneous introduction of Ca and Y suppresses the formation of Mg17Al12 discontinuous precipitates during aging,leading to the enhanced elongation of aged SEN alloys.(6)Adding mischmetal into the SEN9 alloy leads to a six-fold enhancement in extrudability.Consequently,the studies conducted on SEN alloys demonstrate their excellent ignition and corrosion resistances and mechanical properties,which broaden the industrial applications of Mg alloys by addressing their inherent weaknesses.

关 键 词：SEN magnesium alloy Corrosion resistance Ignition resistance Mechanical properties Extrudability. 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG142.71[金属学及工艺—金属材料]