添加In元素对可溶镁合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.07.026

摘要/Abstract

摘要： 以新型Mg-9Al-0.6Zn-0.2Ni-0.2Cu可溶镁合金为研究对象,系统研究了添加In元素对其微观组织、力学性能及腐蚀性能的影响。结果表明,AZ90和AZ90I可溶镁合金的铸态组织由块状β-Mg₁₇Al₁₂相、MgAlNi相、MgAlCu相以及片层状的(α-Mg+β-Mg₁₇Al₁₂)_e共晶相组成,In的加入未引起新相的形成,也未在铸态组织中产生明显的偏析现象。经过均匀化、挤压及固溶处理后,原有的β-Mg₁₇Al₁₂相及片层共晶相基本消失,而MgAlNi和MgAlCu相仍稳定存在。在随后的时效过程中,两种合金均析出β-Mg₁₇Al₁₂相,并呈现出典型的晶界非连续析出(DP)与晶内连续析出(CP)行为。在180 ℃时效条件下,AZ90和AZ90I合金分别在20 h和30 h时达到峰时效状态。由于In在α-Mg基体中的固溶强化作用,AZ90I合金在峰时效态下表现出更高的硬度、屈服强度和抗拉强度。同时,由于In的加入降低了镁基体的电极电位,并破坏了腐蚀表面膜的形成与稳定性,导致AZ90I合金表现出更负的自腐蚀电位、更高的自腐蚀电流密度和更低的电化学阻抗,AZ90I合金在25 ℃和93 ℃的3%KCl溶液环境下均表现出明显高于AZ90合金的腐蚀质量损失速率。

关键词: 可溶镁合金, 合金化, 力学性能, 腐蚀性能

Abstract: Effect of In addition on microstructure, mechanical properties and corrosion properties of novel Mg-9Al-0.6Zn-0.2Ni-0.2Cu degradable magnesium alloys was systematically investigated. The results show that the as-cast microstructure of AZ90 and AZ90I degradable magnesium alloys consists of blocky β-Mg₁₇Al₁₂ phase, MgAlNi phase, MgAlCu phase, and lamellar (α-Mg+β-Mg₁₇Al₁₂)_e eutectic phase. The addition of In does not lead to the formation of new phases, nor produces significant segregation phenomena in the as-cast microstructure. After homogenization, extrusion and solution treatment, the original β-Mg₁₇Al₁₂ phase and lamellar eutectic phase basically disappear, while the MgAlNi and MgAlCu phases remain stable. During the subsequent aging process, β-Mg₁₇Al₁₂ phases are precipitated in both alloys, exhibiting typical discontinuous precipitation (DP) at grain boundaries and continuous precipitation (CP) within grains. When aging at 180 ℃, the AZ90 and AZ90I alloys reach peak aging state at 20 h and 30 h, respectively. Due to the solution strengthening effect of In in the α-Mg matrix, the AZ90I alloy exhibits higher hardness, yield strength, and tensile strength under peak aging state. Meanwhile, the addition of In reduces the electrode potential of the magnesium matrix and disrupts the formation and stability of the corrosion surface film, resulting in the AZ90I alloy exhibiting a more negative self-corrosion potential, higher self-corrosion current density and lower electrochemical impedance, and the AZ90I alloy shows a significantly higher corrosion mass loss rate than that of the AZ90 alloy in 3%KCl solution at 25 ℃ and 93 ℃.

Key words: degradable magnesium alloy, alloying, mechanical properties, corrosion properties

中图分类号:

TG146.2

周晓舟, 孟利, 徐江杰, 张宁, 涂杨, 傅超, 杨勇. 添加In元素对可溶镁合金组织与性能的影响[J]. 金属热处理, 2025, 50(7): 185-192.

Zhou Xiaozhou, Meng Li, Xu Jiangjie, Zhang Ning, Tu Yang, Fu Chao, Yang Yong. Influence of In addition on microstructure and properties of degradable magnesium alloy[J]. Heat Treatment of Metals, 2025, 50(7): 185-192.

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