Effects of Calcium Addition on High Temperature Creep Resistance of Magnesium Alloys with High Zinc

被引：0
|
作者：
Wan Xiaofeng [1 ]
Sun Yangshan [2 ]
Xue Feng [2 ]
Bai Jing [2 ]
Tao Weijian [3 ]
机构：
[1] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Peoples R China
[2] Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Peoples R China
[3] Jiangsu Engn Res Ctr Magnesium Alloys, Nanjing 211224, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2010年 / 39卷 / 12期
关键词：
ZA124 magnesium alloy; quasicrystalline phase; microstructure; creep resistance; CRYSTAL-STRUCTURE; PHASE; MICROSTRUCTURE;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effects of trace Ca addition on microstructure and high-temperature creep resistance of as-cast Mg-12Zn-4Al-0.3Mn alloy were investigated. Results show that the as-cast microstructure of the base alloy consists of alpha-Mg matrix and block quasicrystalline phase at gain boundaries. The composition of this quasicrystalline phase is closed to that of the equilibrium tau phase (Mg-32(Al,Zn)(49)) in the Mg-Zn-Al ternary system. A small amount of Ca addition to the base alloy results in the formation of a lamellar eutectic phi(Al2Mg5Zn2) and the transformation of the quasicrystalline phase to the equilibrium tau phase in the as-cast microstructure of the alloy. The volume fraction of the phi phase increases with the increase of Ca addition. The creep resistance of the alloys is significantly improved by Ca addition. The optimum creep resistance of the alloy is obtained by 0.6% Ca addition under the creep condition of 175 degrees C, 70 MPa, whose steady state creep rate is approximately one order of magnitude lower than that of its base alloy.
引用
收藏
页码：2112 / 2116
页数：5
相关论文
共 14 条
  • [1] Microstructure and tensile creep behavior of Mg-4Al based magnesium alloys with alkaline-earth elements Sr and Ca additions
    Bai, J
    Sun, YS
    Xun, S
    Xue, F
    Zhu, TB
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 419 (1-2): : 181 - 188
  • [2] [白晶 BAI Jing], 2007, [北京科技大学学报, Journal of University Science and Technology Beijing], V29, P198
  • [3] THE CRYSTAL STRUCTURE OF THE METALLIC PHASE MG32 (A1,ZN)
    BERGMAN, G
    WAUGH, JLT
    PAULING, L
    [J]. ACTA CRYSTALLOGRAPHICA, 1957, 10 (04): : 254 - 259
  • [4] The crystal structure of the equilibrium Φ phase in Mg-Zn-Al casting alloys
    Bourgeois, L
    Muddle, BC
    Nie, JF
    [J]. ACTA MATERIALIA, 2001, 49 (14) : 2701 - 2711
  • [5] IMPURITY-DRAG EFFECT IN GRAIN BOUNDARY MOTION
    CAHN, JW
    [J]. ACTA METALLURGICA, 1962, 10 (SEP): : 789 - &
  • [6] Liu C M, 2006, MAGNESIUM PHASE DIAG, P256
  • [7] AMORPHOUS AND QUASI-CRYSTALLINE PHASES IN RAPIDLY SOLIDIFIED MG-AL-ZN ALLOYS
    NIIKURA, A
    TSAI, AP
    NISHIYAMA, N
    INOUE, A
    MASUMOTO, T
    [J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 1994, 181 (pt 2): : 1387 - 1391
  • [8] Creep resistant magnesium alloys for powertrain applications
    Pekguleryuz, MO
    Kaya, AA
    [J]. ADVANCED ENGINEERING MATERIALS, 2003, 5 (12) : 866 - 878
  • [9] Sun Y, 2001, ACTA METALL SIN, V37, P332
  • [10] Quasi-crystalline grain-boundary phase in the magnesium die-cast alloy ZA85
    Vogel, M
    Kraft, O
    Dehm, G
    Arzt, E
    [J]. SCRIPTA MATERIALIA, 2001, 45 (05) : 517 - 524
12