析出相尺度对Mg-Ca合金力学及腐蚀性能的影响

Effect of Precipitated Phase Scale on Mechanical Properties and Corrosion Resistance of Mg-Ca Alloy

铸造Mg-Ca合金的显微组织主要由Mg基体和晶界处的析出相Mg2Ca组成,析出相的尺度与合金的力学及腐蚀行为密切相关。通过改变Ca元素的含量,调控铸造Mg-Ca二元合金的析出相尺度。结果表明:合金析出相的尺度与钙含量成正比,而且钙的添加提高了合金的屈服强度,但明显降低了合金的塑性。另外,钙添加促进了合金的腐蚀行为,且腐蚀速率与钙含量成正比。

As-cast Mg-Ca alloy was composed of Mg matrix and Mg2Ca precipating along with the grain boundaries. The scale of the precipitated phase was closely related to the mechanical and corrosion behavior of the alloy. By changing the content of Ca, the precipitated phase scale of casting Mg-Ca binary alloy was controled. The results show that： the precipitated phase scale of the alloy with the content of Ca is a proportionality, and the added Ca can improve the yield strength of the alloy, but obviously lower the plasticity of the alloy, the addition of Ca can drive the corrosion behavior of the alloy, and the corrosion rate has a direct ratio relationship with the addition of Ca.