A series of Mg-12Zn-4Al-0.3Mn (ZA124) based alloys with additions of calcium have been prepared
and their microstructure and properties have been investigated. The results show that Mg-12Zn-4Al-0.3Mn alloy
consists of the α-Mg matrix and block quasicrystal and exhibits excellent creep resistance compared to commonly
used AZ91 alloy. A small amount of calcium addition to the ZA124 based alloys increased the yield strenghth
at both ambient and elevated temperatures as well as creep resistance, although the ductility decreased slightly.
Microanalysis indicated that the addition of calcium decreased the quasicrystalline phase and caused the formation
of some lamellar precipitates of Al2Mg5Zn2 with orthorhombic crystal structure. This Ca-containing Al2Mg5Zn2
phase with high stability straddled the grain boundaries and strengthened grain boundaries by inhibiting crack
propagation during creep tests at elevated temperature.
WAN Xiao-feng (万晓峰), NI Hong-jun (倪红军), HUANG Ming-yu (黄明宇)
. Improvements of Elevated Temperature Strength and Creep
Resistance of Mg-12Zn-4Al Based Alloy with Calcium Addition[J]. Journal of Shanghai Jiaotong University(Science), 2012
, 17(3)
: 273
-276
.
DOI: 10.1007/s12204-012-1267-z
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