Adding Ti particles to magnesium alloy simultaneously enhances its strength and ductility.However,how these particles influence on Mg alloy’s corrosion performance is seldom reported.The corrosion behavior of AZ31-Ti...Adding Ti particles to magnesium alloy simultaneously enhances its strength and ductility.However,how these particles influence on Mg alloy’s corrosion performance is seldom reported.The corrosion behavior of AZ31-Ti composites containing titanium nanoparticles(1.5 and 5 wt%)and micron particles(10 wt%)prepared by powder metallurgical in 3.5 wt%NaCl solution was investigated.The results indicate that Ti particles serve as the primary location for the cathodic hydrogen reduction reaction,resulting in intense galvanic corrosion between the Ti and Mg matrix.Ti nanoparticles distributed at the interface of the original AZ31 powder were in a discontinuous mesh structure,thus failing to act as a barrier against corrosion.The corrosion products with the existence of numerous cracks gradually peel off during the corrosion process and cannot protect the matrix.The average corrosion rate P_(w) of AZ31,AZ31-1.5%Ti,AZ31-5%Ti,and AZ31-10%Ti after 7 days of immersion is 27.55,105.65,283.67,and 99.35 mm/y,respectively.Therefore,AZ31-Ti composites can be considered as potential candidates for degradable fracturing tools.Otherwise,it is recommended to improve their corrosion resistance through surface treatment.展开更多
Al-Ti-C-Y master alloy was prepared by combining SHS technique and melting-casting method. The microstructure of master alloy and its grain-refining effect on AZ31 alloy were investigated by means of OM, XRD, SEM and ...Al-Ti-C-Y master alloy was prepared by combining SHS technique and melting-casting method. The microstructure of master alloy and its grain-refining effect on AZ31 alloy were investigated by means of OM, XRD, SEM and EDS. Experimental results indicated that the prepared master alloy consisted of α-Al, TiAl3, TiC and Al3Y phases, and exhibited good grain-refining performance of AZ31 alloy. Morphology of α-Mg changed from coarse dendritic to free equiaxed and the average grain size of α-Mg matrix reduced from the original 580 to 170 μm after adding 1.0 wt.% master alloy. The grain refining efficiency of Al-Ti-C-Y master alloy on AZ31 alloy was mainly attributed to heterogeneous nucleation of TiC particles and grain growth restriction of Al-Y compound or TiC at grain boundaries.展开更多
目的提高AZ31镁合金的耐磨及耐腐蚀性能。方法采用磁控溅射技术对镁合金进行表面镀钛处理,用扫描电镜研究膜基界面形貌及界面成分,分析结合性能。通过摩擦磨损试验,对比分析镁合金基体和镀Ti膜样品的耐磨性能;通过Tafel极化曲线,对比分...目的提高AZ31镁合金的耐磨及耐腐蚀性能。方法采用磁控溅射技术对镁合金进行表面镀钛处理,用扫描电镜研究膜基界面形貌及界面成分,分析结合性能。通过摩擦磨损试验,对比分析镁合金基体和镀Ti膜样品的耐磨性能;通过Tafel极化曲线,对比分析镁合金基体和镀Ti膜样品的耐蚀性能。结果 Ti膜均匀致密,与镁合金基体结合良好。镁合金镀Ti膜后,摩擦系数和磨损失重率下降,腐蚀电位向正方向移动了430 m V,腐蚀电流密度从10.83 m A/cm2下降到2.62×10-7m A/cm2。结论磁控溅射镀Ti膜提高了AZ31镁合金的耐磨和耐蚀性能。展开更多
基金funded by the Guangdong Major Project of Basic and Applied Basic Research (Grant No.2020B0301030006)。
文摘Adding Ti particles to magnesium alloy simultaneously enhances its strength and ductility.However,how these particles influence on Mg alloy’s corrosion performance is seldom reported.The corrosion behavior of AZ31-Ti composites containing titanium nanoparticles(1.5 and 5 wt%)and micron particles(10 wt%)prepared by powder metallurgical in 3.5 wt%NaCl solution was investigated.The results indicate that Ti particles serve as the primary location for the cathodic hydrogen reduction reaction,resulting in intense galvanic corrosion between the Ti and Mg matrix.Ti nanoparticles distributed at the interface of the original AZ31 powder were in a discontinuous mesh structure,thus failing to act as a barrier against corrosion.The corrosion products with the existence of numerous cracks gradually peel off during the corrosion process and cannot protect the matrix.The average corrosion rate P_(w) of AZ31,AZ31-1.5%Ti,AZ31-5%Ti,and AZ31-10%Ti after 7 days of immersion is 27.55,105.65,283.67,and 99.35 mm/y,respectively.Therefore,AZ31-Ti composites can be considered as potential candidates for degradable fracturing tools.Otherwise,it is recommended to improve their corrosion resistance through surface treatment.
基金the Natural Science Foundation of Shanxi Province (2007011067)Patent Generalization Project of Shanxi Province (051025)
文摘Al-Ti-C-Y master alloy was prepared by combining SHS technique and melting-casting method. The microstructure of master alloy and its grain-refining effect on AZ31 alloy were investigated by means of OM, XRD, SEM and EDS. Experimental results indicated that the prepared master alloy consisted of α-Al, TiAl3, TiC and Al3Y phases, and exhibited good grain-refining performance of AZ31 alloy. Morphology of α-Mg changed from coarse dendritic to free equiaxed and the average grain size of α-Mg matrix reduced from the original 580 to 170 μm after adding 1.0 wt.% master alloy. The grain refining efficiency of Al-Ti-C-Y master alloy on AZ31 alloy was mainly attributed to heterogeneous nucleation of TiC particles and grain growth restriction of Al-Y compound or TiC at grain boundaries.
文摘目的提高AZ31镁合金的耐磨及耐腐蚀性能。方法采用磁控溅射技术对镁合金进行表面镀钛处理,用扫描电镜研究膜基界面形貌及界面成分,分析结合性能。通过摩擦磨损试验,对比分析镁合金基体和镀Ti膜样品的耐磨性能;通过Tafel极化曲线,对比分析镁合金基体和镀Ti膜样品的耐蚀性能。结果 Ti膜均匀致密,与镁合金基体结合良好。镁合金镀Ti膜后,摩擦系数和磨损失重率下降,腐蚀电位向正方向移动了430 m V,腐蚀电流密度从10.83 m A/cm2下降到2.62×10-7m A/cm2。结论磁控溅射镀Ti膜提高了AZ31镁合金的耐磨和耐蚀性能。
