In the present study, Mg-4Zn-1Si alloy was subjected to equal channel angular pressing (ECAP) up to 4 passes at 300 °C, followed by ball burnishing using 0.3 mm depth of press, 300 mm/min feed and 1 pass successfully. The effect of ECAP and ECAP + ball burnishing process on microstructure, mechanical properties (tensile and hardness) and corrosion behavior was systematically investigated. After 4 pass ECAP, initial coarse grains (210 μm) were refined and average grain size is 6 μm and after ball burnishing, the grain size is found to be 3.3 μm. Microstructure evolution is discussed using optical images, scanning electron microscope images and transmission electron microscope images. For ECAP samples, maximum strength and hardness was recorded at 3 pass. Both strength and hardness decreased for 4 pass ECAP processed samples, even though grain size decreased, this is because of texture modification in the material. ECAP 4 pass + ball burnished samples exhibited 48.5% enhancement of microhardness as compared to 4 pass ECAP samples. Corrosion resistance of the samples decreased with increase in the number of ECAP passes, this is due to strain-induced grain refinement with more crystalline defects in samples. Combined process of ECAP and ball burnishing effectively reduces the Icorr and this consequently reduces corrosion rate of the Mg–4Zn-1Si alloy.

在本研究中，对Mg-4Zn-1Si合金在300°C下进行等通道角压（ECAP）最多4道次，然后使用0.3毫米压力深度，300毫米/分钟的进给和1道成功地进行球磨。系统地研究了ECAP和ECAP +球形抛光工艺对组织，力学性能（拉伸和硬度）和腐蚀行为的影响。经过4次ECAP后，细化了初始粗晶粒（210μm），平均晶粒尺寸为6μm，球磨光后，发现晶粒尺寸为3.3μm。使用光学图像，扫描电子显微镜图像和透射电子显微镜图像讨论了微观结构的演变。对于ECAP样品，在3次通过时记录了最大强度和硬度。4次通过ECAP处理的样品的强度和硬度均下降，即使晶粒尺寸减小，这也是由于材料中的纹理改变。与4遍ECAP样品相比，ECAP 4遍+球形抛光样品的显微硬度提高了48.5％。样品的耐蚀性随ECAP通过次数的增加而降低，这是由于应变引起的晶粒细化以及样品中更多的晶体缺陷。ECAP和滚珠抛光的组合工艺有效地降低了Icorr，因此降低了Mg–4Zn-1Si合金的腐蚀速率。这是由于应变引起的晶粒细化，样品中出现更多的晶体缺陷。ECAP和滚珠抛光的组合工艺有效地降低了Icorr，因此降低了Mg–4Zn-1Si合金的腐蚀速率。这是由于应变引起的晶粒细化，样品中出现更多的晶体缺陷。ECAP和滚珠抛光的组合工艺有效地降低了Icorr，因此降低了Mg–4Zn-1Si合金的腐蚀速率。