CAJ | 학술논문

　　采用铜模喷铸法制备直径为1.5、2和3 mm的Mg69Zn27Ca4合金。采用X射线衍射(XRD)、力学性能实验及电化学实验研究冷却速率对合金的显微组织、力学性能及腐蚀性能的影响。结果表明：当直径为1.5 mm时，合金为完全非晶态；随着冷却速率的下降，合金中出现韧性的α-Mg和Mg?Zn相，使得3 mm直径样品的压缩应变量达到3.1%，优于1.5 mm非晶合金的1.3%。此外，制备的Mg?Zn?Ca合金在模拟海水中的抗腐蚀性能远好于传统的ZK60镁合金。
　　채용동모분주법제비직경위1.5、2화3 mm적Mg69Zn27Ca4합금。채용X사선연사(XRD)、역학성능실험급전화학실험연구냉각속솔대합금적현미조직、역학성능급부식성능적영향。결과표명：당직경위1.5 mm시，합금위완전비정태；수착냉각속솔적하강，합금중출현인성적α-Mg화Mg?Zn상，사득3 mm직경양품적압축응변량체도3.1%，우우1.5 mm비정합금적1.3%。차외，제비적Mg?Zn?Ca합금재모의해수중적항부식성능원호우전통적ZK60미합금。
Mg69Zn27Ca4 alloys with diameters of 1.5, 2 and 3 mm were fabricated using copper mold injection casting method. Microstructural analysis reveals that the alloy with a diameter of 1.5 mm is almost completely composed of amorphous phase. However, with the cooling rate decline, a little α-Mg and MgZn dendrites can be found in the amorphous matrix. Based on the microstructural and tensile results, the ductile dendrites are conceived to be highly responsible for the enhanced compressive strain from 1.3% to 3.1% by increasing the sample diameter from 1.5 mm to 3 mm. In addition, the Mg69Zn27Ca4 alloy with 1.5 mm diameter has the best corrosion properties. The current Mg-based alloys show much better corrosion resistance than the traditionally commercial wrought magnesium alloy ZK60 in simulated sea-water.