摘要
A biodegradable Mg−2Zn−0.4Sc−0.2Zr(ZK20−0.4Sc)alloy wire with a diameter of 0.5 mm was prepared by a combination of hot extrusion and cold-drawing.The average grain size of ZK20−0.4Sc alloy wire on the longitudinal section along the drawing direction is approximately 7.3μm.The texture results show relatively strong<1020>and weak<1010>fiber texture components parallel to the drawing direction.The ZK20−0.4Sc alloy wire exhibits better mechanical properties with the tensile strength,yield strength and elongate of(329±2)MPa,(287±2)MPa and(14.2±0.5)%,respectively.The better mechanical properties are mainly attributed to the grain refinement strengthening,dislocation strengthening and precipitation strengthening.With the immersion time increasing to 14 d,the corrosion type transfers from filament corrosion and pitting corrosion to severe localized corrosion.
采用热挤压和冷拔相结合的方法制备直径为0.5 mm的可生物降解Mg-2Zn-0.4Sc-0.2Zr(ZK20-0.4Sc)合金丝。ZK-20-0.4Sc合金丝-沿拉伸方向纵截面的平均晶粒尺寸约为7.3μm。织构结果显示,平行于拉伸方向形成较强的<1020>和较弱的<1010>纤维织构组分。该合金丝具有较优的力学性能,其抗拉强度为(329±2)MPa,屈服强度为(287±2)MPa,伸长率为(14.2±0.5)%。其较优的力学性能主要归因于细晶强化、位错强化和析出强化。随着浸泡时间增加至14 d,该合金丝的腐蚀类型由丝状腐蚀和点蚀转变为严重的局部腐蚀。
基金
financial support from the National Nature Science Foundation of China (No.52274369)
the Hunan Provincial Natural Science Foundation,China (No.2024JJ6521)。
