Influence of Sr on microstructure evolution, mechanical and corrosion properties of extruded Mg-2Zn-0.5Ca alloy

IF 15.8 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Journal of Magnesium and Alloys Pub Date : 2024-09-01 DOI:10.1016/j.jma.2023.03.008

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引用次数: 0

Abstract

Degradable Mg-Zn-Ca alloys with Sr addition were prepared by vacuum melting and hot extrusion. Effect of Sr on microstructure, mechanical and corrosion properties of hot extruded Mg-2Zn-0.5Ca-xSr (x = 0, 0.5, 1.0) alloys was investigated. The results show that Sr addition into Mg-2Zn-0.5Ca alloys produced significant grain refinement in ingots and obvious texture weakening effects in extruded bars. The ultimate compressive strength increased as the Sr content increased, while the ultimate tensile strength increased firstly and then declined with the increasing of Sr content. Electrochemical tests indicated the corrosion current density of the surface parallel to extrusion direction (ED) was much lower than that of the surface perpendicular to ED. In-vitro immersion tests demonstrated the increase in the pH of solution and weight loss of Mg-2Zn-0.5Ca-0.5Sr alloy remain the lowest during immersion tests. The best comprehensive property was obtained in Mg-2Zn-0.5Ca-0.5Sr alloy, which has the largest strength and the best corrosion resistance.

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Sr对挤压Mg-2Zn-0.5Ca合金组织演变、力学性能和腐蚀性能的影响

通过真空熔炼和热挤压制备了添加了 Sr 的可降解 Mg-Zn-Ca 合金。研究了 Sr 对热挤压 Mg-2Zn-0.5Ca-xSr（x = 0、0.5、1.0）合金的微观结构、机械性能和腐蚀性能的影响。结果表明，在 Mg-2Zn-0.5Ca 合金中添加 Sr 后，铸锭中的晶粒明显细化，而挤压棒材中的质地则明显减弱。极限抗压强度随着 Sr 含量的增加而增加，而极限抗拉强度则随着 Sr 含量的增加先增加后下降。电化学测试表明，与挤压方向（ED）平行表面的腐蚀电流密度远低于与 ED 垂直表面的腐蚀电流密度。体外浸泡试验表明，在浸泡试验过程中，溶液 pH 值升高，Mg-2Zn-0.5Ca-0.5Sr 合金的重量损失仍然最小。Mg-2Zn-0.5Ca-0.5Sr 合金的综合性能最好，具有最大的强度和最佳的耐腐蚀性。

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来源期刊

Journal of Magnesium and Alloys Engineering-Mechanics of Materials

CiteScore

20.20

自引率

14.80%

发文量

审稿时长

59 days

期刊介绍： The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.