The structure, composition range and phase equilibria of the ternary compounds in Mg-rich side of the Mg-Zn-Ca system have been investigated by SEM, EPMA, XRD and TEM. It has been shown that there exist two ternary compounds T1 and T2 in equilibrium with the Mg-based solid solution in the Mg-Zn-Ca system. T1 phase is a linear compound with hexagonal structure, whose structure parameters decrease with the Zn content, i.e. a=0.995-0.945 nm, c=1.036-1.003 nm. Its composition region (atomic fraction, %) is Ca about 16, Zn 16.8-49.5 and balanced Mg. The composition region of the T2 phase is Mg 27.1-29.3, Zn 62.1-64.4 and Ca 7.6-9.0. T2 phase also has the hexagonal structure, whose structure parameters are a=1.475 nm and c=0.879 nm. At 335 ℃, the dissolution of Zn has not decreased the solubility of Ca in the α-Mg solid solution, but the solubility of Zn in the α-Mg solid solution increases with the dissolution of Ca, and the maximum solubility of Zn is 4.6. At 335 ℃, there are five three--phase fields consisting of α-Mg+Mg2Ca+T1, α-Mg+T1+T2, α-Mg+T2+MgZn, MgZn+T2+Mg2Zn3 and α-Mg+Mg7Zn3+MgZn in the Mg-Zn-Ca system, respectively.
LI Hong-Xiao
,
MA Qian-Qian
,
REN Yu-Beng
,
JIANG Min
,
QIN Gao-Wu
. TERNARY COMPOUNDS AND RELATIVE PHASE EQUILIBRIA IN THE Mg-RICH SIDE OF THE Mg-Zn-Ca SYSTEM[J]. Acta Metall Sin, 2011
, 47(4)
: 385
-390
.
DOI: 10.3724/SP.J.1037.2010.00638
[1] Massalski T B, Okamoto H, Subramanian P R, Kacprzak L. Binary Alloy Phase Diagrams, 2nd ed. Plus Updates, CD–ROM, Materials Park, Ohio: ASM International, 1996
[2] Maeng D Y, Kim T S, Lee J H, Hong S J, Seo S K, Chun B S. Scr Mater, 2000; 43: 385
[3] You B S, Park W W, Chung I S. Scr Mater, 2000; 42: 1089
[4] Vostr´y P, Stul´?kov´a I, Smola B, Riehemann W, Mordike B L. Mater Sci Eng, 1991; A137: 87
[5] Oh J C, Ohkubo T, Mukai T, Hono K. Scr Mater, 2005; 53: 675
[6] Nie J F, Muddle B C. Scr Mater, 1997; 37: 1475
[7] Bettles C J, Gibson M A, Venkatesan K. Scr Mater, 2004; 51: 193
[8] Geng L, Zhang B P, Li A B, Dong C C. Mater Lett, 2009; 63: 557
[9] Villars P, Prince A, Okamoto H. Handbook of Ternary Alloy Phase Diagrams, CD–ROM, Materials Park, Ohio: ASM International, 1997
[10] Brubaker C O, Liu Z K. J Alloys Compd, 2004; 370: 114
[11] Wasiur–Rahman S, Medraj M. Intermetallics, 2009; 17: 847
[12] Levi G, Avraham S, Zilberov A, Bamberger M. Acta Mater, 2006; 54: 523
[13] Jardim P M, Solorzano G, Vander Sande J B. Mater Sci Eng, 2004; A381: 196
[14] Larionova T V, Park W W, You B S. Scr Mater, 2001; 45: 7
[15] Oh–ishi K, Watanabe R, Mendis C L, Hono K. Mater Sci Eng, 2009; A526: 177
[16] Zhou T, Chen D, Chen Z H. Trans Nonferrous Met Soc China, 2008; 18: s101
