郭学锋,杨文朋,宋佩维

• 1:河南理工大学材料科学与工程学院
• 2:西安理工大学材料科学与工程学院

摘要(Abstract)：

利用往复挤压(RE-n,n为挤压道次)制备Mg-4Al-2Si(AS42)、Mg-4Al-4Si(AS44)和Mg-6Al-6Si(AS66)合金,并在150℃和1.33×10-3s-1的初始应变速率下测试合金的拉伸性能。结果表明:RE-8-AS42合金晶粒尺寸为2.1μm,Mg2Si颗粒尺寸为1.3μm;RE-4-AS42合金晶粒尺寸为4.8μm,组织中含有2～20μm的大块Mg2Si颗粒;RE-AS44和RE-AS66合金晶粒尺寸约为11μm,组织中存在>20μm的Mg2Si颗粒。合金拉伸强度随挤压道次增加而提高,RE-8-AS42合金性能最佳,抗拉强度、屈服强度和伸长率分别为250 MPa、197 MPa和62%,高的性能归因于细小的晶粒和阻碍晶界滑移的细小稳定Mg2Si颗粒。

关键词(KeyWords)： Mg-Al-Si合金;往复挤压;高温拉伸性能

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(50271054);; 教育部博士点基金(20070700003);; 河南省科技攻关资助项目(102102210031);; 河南省教育厅自然科学基金资助项目(2010A430008)

作者(Author): 郭学锋,杨文朋,宋佩维

DOI: 10.13289/j.issn.1009-6264.2012.02.010

参考文献(References)：

• [1]Hong T K,Terry O.Mechanial behavior of cast and forged magnesium alloys and their microstructures[J].Materials Science and Engineering A,2008,490:52-56.
• [2]Stefano S.Constitutive equations in creep of Mg-Al alloys[J].Materials Science and Engineering A,2008,492:153-160.
• [3]Meshinchi Asl K,Tari A,Khomamizadeh F.The effect of different content of Al,RE and Si element on the microstructure,mechanical and creepproperties of Mg-Al alloys[J].Materials Science and Engineering A,2009,523(1-2):1-6.
• [4]Spigarelli S,Ciccarelli D,Evangelista E.Compressive deformation of an Mg-Al-Si-RE alloy between 120 and 180℃[J].Materials Letters,2004,58(3-4):460-464.
• [5]Fang X,Yi D,Wang B,et al.Hot compression deformation behavior of the Mg-Al-Y-Zn magnesium alloy[J].Rare Metals,2008,27(2):121-126.
• [6]Szczech J R,Jin S.Mg2Si nanocomposite converted from diatomaceous earth as a potential thermoelectric nanomaterial[J].Journal of Solid StateChemistry,2008,181(7):1565-1570.
• [7]Wang L,Qin X Y,Xiong W,et al.Fabrication and mechanical properties of bulk nanocrystalline intermetallic Mg2Si[J].Materials Science andEngineering A,2007,459(1-2):216-222.
• [8]Wang H Y,Wang W,Zha M,et al.Influence of the amount of KBF4 on the morphology of Mg2Si in Mg-5Si alloys[J].Materials Chemistry andPhysics,2008,108(2-3):353-358.
• [9]Tamura D,Nagai R,Sugimoto K et al.Melt growth and characterization of Mg2Si bulk crystals[J].Thin Solid Films,2007,515(22):8272-8276.
• [10]Blum W,Zhang P,Watzinger B,et al.Comparative study of creep of the die-cast Mg-alloys AZ91,AS21,AS41,AM60 and AE42[J].MaterialsScience and Engineering A,2001,319-321:735-740.
• [11]Evangelista E,Spigarelli S,Cabibbo M,et al.Analysis of the effect of Si content on the creep response of an Mg-5Al-Mn alloy[J].Materials Scienceand Engineering A,2005,410-411:62-66.
• [12]Guo E,Ma B,Wang L.Modification of Mg2Si morphology in Mg-Si alloys with Bi[J].Journal of Materials Processing Technology,2008,206(1-3):161-166.
• [13]Lee S,Yeh J.Superplasticity of 5083 alloys with Zr and Mn additions produced by reciprocating extrusion[J].Materials Science and Engineering A,2007,460:409-419.
• [14]Guo X F,Shechtman D.Reciprocating extrusion of rapidly solidified Mg-6Zn-1Y-0.6Ce-0.6Zr alloy[J].Journal of Materials Processing Technology,2007,187-188:640-644.
• [15]Lee S W,Chen Y L,Wang H Y,et al.On mechanical properties and superplasticity of Mg-15Al-1Zn alloys processed by reciprocating extrusion[J].Materials Science and Engineering A,2007,464(1-2):76-84.
• [16]Somekawa H,Hirai K,Watanabe H,et al.Dislocation creep behavior in Mg-Al-Zn alloys[J].Materials Science and Engineering A,2005,407(1-2):53-61.
• [17]Chen P,Lu Q,Sun Y,et al.High strain rate superplasticity in SiCp reinforced AZ31 magnesium matrix composite[J].Transactions of NanjingUniversity of Aeronautics and Astronautics,2001,18(1):17-21.
• [18]Mann G,Griffiths J R,Caceres C H.Hall-Petch parameters in tension and compression in cast Mg-2Zn alloys[J].Journal of Alloys and Compounds,2004,378(1-2):188-191.

文章评论(Comment)：