陈健美,张新明,熊创贤,蒋浩,邓桢桢

• 1:中南大学材料科学与工程学院
• 2:中南大学材料科学与工程学院
• 3:中南大学材料科学与工程学院
• 4:中南大学材料科学与工程学院

摘要(Abstract)：

对MgGdYMn和MgGdYMnSc合金挤压成形,并对挤压合金热处理后的试样进行室温和高温拉伸实验。用金相显微镜(OM)、扫描(SEM)和透射电镜(TEM)等方法,研究添加Mn、Sc元素对该合金组织与力学性能的影响。结果表明:添加Mn元素能有效地提高Mg-9Gd-4Y合金形变细化晶粒的能力以及T6处理提高室温综合性能。添加Sc元素能提高合金的室温伸长率,但强度有所降低。添加Mn的合金在300℃拉伸时强度为200MPa,在400℃拉伸时显示出超塑性行为,而再添加Sc的合金在300℃拉伸时有超塑性表现。同时添加Mn和Sc的合金室温和高温强度下降。

关键词(KeyWords)： 镁合金;挤压;力学性能;热处理;Mn;Sc

Abstract:

Keywords:

基金项目(Foundation): 国家“863”计划资助项目(03AA741043);; 湖南省自然科学基金资助项目(03JJY4051)

作者(Author): 陈健美,张新明,熊创贤,蒋浩,邓桢桢

参考文献(References)：

• [1]Mordike B L,Ebert T.Magnesium properties-application-potential[J].Mater Sci Eng,2001,302A:37-45.
• [2]余锟,黎文献,王日初,马正清.变形镁合金的研究、开发及应用[J].中国有色金属学报,2003,13:277-288.YU Kun,LI Weng-xian,WANG Ri-chu,MA Zheng-qing.Research,development and application of wrought magnesium alloys[J].The Chinese Journal ofNonferrous Metals,2003,13:277-288.
• [3]Rokhlin L L,Nikitina N I.Mg-Gd and Mg-Gd-Y alloys[J].Z Metalled,1994,85(12):819-823.
• [4]Mordike B L.Development of highly creep resistant magnesium alloys[J].Journal of Materials Processing Technology,2001,117:391-394.
• [5]Apps P J,Karimzadeh H,King J F,Lorimer G W.Precipitation reactions in Magnesium-rare earth alloys containing Yttrium,Gadolinium or Dysprosium[J].Scripta Materialia,2003,48:1023-1028.
• [6]Nie J F,Muddle B C.Precipitation in magnesium alloy WE54 during isothermal aging at 250℃[J].Scr Mater,1999,40:1089-1094.
• [7]Antion C,Donnadieu P,Perrard F,et al.Hardening precipitation in a Mg-4Y-3RE alloy[J].Acta Mater,2003,51:5335-5348.
• [8]Drits M E,Sviderkaya Z A,Rokhlin L L,et al.Effect of alloying on properties of Mg-Gd alloys[J].Mellaovednie I Termicheskaya Obrabotla Mellalov,1979,21:62-64.
• [9]Shigeharu K,Yutaka K,Yoshitada H.High temperature deformation characteristics and forgeability of Mg-heavy rare earth element-Zr alloys[J].Journal ofJapan Institute of Light Metals,1998,48(4):168-173.
• [10]Anyanwu I A,Kamado S,Kojima Y.Creep properties of Mg-Gd-Y-Zr alloys[J].Mater Trans,2001,42(7):1212-1218.
• [11]Ono N,Nowak R,Miura S.Effect of deformation temperature on Hall-Petch relationship registered for polycrystalline magnesium[J].Materials Letters,2003,58:39-43.
• [12]Grobner J,Schmid-Fetzer R.Selection of promising quaternary candidates from Mg-Mn-(Sc,Gd,Y,and Zr)for development of creep-resistant magnesiumalloys[J].Journal of Alloys and Compounds,2001,320:296-301.
• [13]Pisch A,Schmid-Fetzer R.Experimental study and thermodynamic assessment of phase equilibria in the Mn-Sc system[J].Z Metallkd,1998,89(10):700-703.
• [14]Von Buch F,Lietzau J,Mordike B L,et al.Development of Mg-Sc-Mn alloys[J].Materials Science and Engineering,1999,A263:1-7.
• [15]Emley E F.Principles of Magnesium Technology[M].Pergamon Press Ltd,London 1966.
• [16]Drits M E,Rokhlin L L,Nikitina N I.State diagram of the Mg-Y-Gd system in the range rich in magnesium[J].Izvestiya Akademii Nauk SSSR,Metally,1983,5:215-219.

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