采用雾化-双辊急冷法成功制备了快速凝固（RS）Mg-Zn-Ca合金薄片,分析了不同含量的Ca对RS Mg-Zn合金微观组织、物相种类和热稳定性的影响。结果表明,RS Mg-6Zn合金的组织细小,晶粒尺寸为6～10μm,其相组成为α-Mg、Mg51Zn20相及少量的MgZn2和Mg2Zn3相。随着Ca的加入及其含量的增加,合金的组织显著细化（达到3～5μm）、析出相的数量大幅度增加,同时低熔点的Mg51Zn20相逐渐被大量热稳定的Ca2Mg6Zn3和Mg2Ca相替代,有效地阻碍了高温下晶界的运动,从而有助于合金组织热稳定性的提高;其中,RS Mg-6Zn-5Ca合金最为显著。
Rapidly solidified（RS） Mg-Zn based alloys with Ca addition were produced via atomizing the alloy melt and subsequent splat-quenching on water-cooled copper twin-rollers in the form of flakes.The effects of Ca additions on microstructure,phase composition and thermal stability of the RS Mg-Zn alloy were investigated.The results show that the microstructure of RS Mg-6Zn alloy is characteristics of fine grains in the size of 6-10 μm and composed of α-Mg,Mg51Zn20 and a small quantity of MgZn2 and Mg2Zn3 phases.The microstructure of the alloys is refined and the volume fractions of precipitates are increased remarkably with increasing of Ca,and a large number of Ca2Mg6Zn3 and Mg2Ca phases with high melting points form at the expense of the Mg51Zn20 phases,which leads to the enhanced thermal stability of the alloys,especially for the Mg-6Zn-5Ca alloy.
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