作　　者： (刘利）; (刘正）; (李吉宝）; (王峰）;

机构地区： 沈阳工业大学理学院,辽宁沈阳110870 沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处： 《热加工工艺》 2017年第16期97-100,共4页

摘　　要： 采用金属型铸造法制备Mg-4Zn-1Y(wt%)合金,并在450℃下挤压成棒材。利用光学显微镜、扫描电镜、X射线衍射、浸泡试验及电化学试验对铸态和挤压态Mg-4Zn-1Y微观组织、相组成及其在3.5%NaCl溶液中的腐蚀行为进行研究。结果表明:铸态合金的平均晶粒尺寸为50~60μm,而挤压态合金的平均晶粒尺寸降低到4~5μm。热挤压可明显提高合金的耐腐蚀性,且挤压态合金纵截面耐腐蚀性要稍优于横截面。在3.5%NaCl溶液中,挤压态合金纵截面的腐蚀速率仅为铸态合金腐蚀速率的1/2。 Mg-4Zn-1Y（wt%） alloy ingot was fabricated by permanent mold casting method, and the alloy was extruded into bars at 450℃. The microstructures and phase composition of as-cast and extruded Mg-4Zn-1Y alloys were observed by optical microscope, scanning electron microscope and X-ray diffraction. The corrosion behavior of the alloy in 3.5% NaCl solution was investigated by immersion test and electrochemical test. The results show that the average grain size of the as-cast alloy is 50-60 μm and that of the extruded alloy is 4-5 μm. The corrosion resistance of the alloy improves significantly by hot extrusion, and the corrosion resistance of the longitudinal-section of the extruded alloy is slightly superior to that of the cross-section. In 3.5% NaCl solution, and the corrosion rate of longitudinal-section of the extruded alloy is only half of that of the as-cast alloy.

关 键 词： 合金 热挤压 微观组织 腐蚀性能