Effects of Ga on the corrosion behaviors of severe plastic deformation strengthened biodegradable Mg-2Zn-xGa alloys

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-08-18 DOI:10.1016/j.corsci.2025.113265

Donglei He , Mengran Zhou , Zhenhai Dai , Ziyue Zhang , Qingyu Shi , Xinze Dong , Gaoqiang Chen , Yuxiang Han , Yuru Zha , Haoye Meng , Fan Ye , Li Zhong , Fan Liu , Hao Gong , Yang Zheng , Weikang Zhao , Timo Lehtonen , Yan Li , Yake Liu

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Abstract

Friction stir processing (FSP) was performed on as-cast biodegradable Mg-2Zn-xGa (x = 3, 5, 7 wt%) alloys and the effects of Ga on the corrosion behaviors of FSPed Mg-2Zn-xGa were systematically investigated in this work. Increasing Ga content in the alloys could remarkably refine the microstructure and weaken the texture of FSPed Mg-2Zn-xGa due to stimulated recrystallization and grain-growth hindrance induced by increasing Mg₅Ga₂ precipitates. FSPed Mg-2Zn-3Ga had the lowest corrosion rate (0.23 mm/y) due to the almost complete dissolution of Mg₅Ga₂ precipitates, strongest (0001) basal texture, and largest number fraction of low angular grain boundary induced by FSP. With increasing Ga content, FSPed Mg-2Zn-xGa showed finer grains but faster corrosion rate due to the existence of increasing Mg₅Ga₂ precipitates, weaker (0001) basal texture, and lower number fraction of low angular grain boundary. The corrosion products presented a double-layer structure with an outer layer dominated by Ca₃(PO₄)₂ and an inner layer dominated by Mg(OH)₂.

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Ga对剧烈塑性变形强化可生物降解Mg-2Zn-xGa合金腐蚀行为的影响

本文对铸态可生物降解Mg-2Zn-xGa （x = 3,5,7 wt%）合金进行了搅拌摩擦处理（FSP），系统地研究了Ga对FSP Mg-2Zn-xGa腐蚀行为的影响。随着合金中Ga含量的增加，镁合金的组织明显细化，织构减弱，这是由于Mg5Ga2析出物的增加引起的再结晶和晶粒生长阻碍。由于Mg5Ga2析出相几乎完全溶解，FSP Mg-2Zn-3Ga的腐蚀速率最低（0.23 mm/y），基底织构最强（0001），FSP诱导的低角晶界数分数最大。随着Ga含量的增加，FSPed Mg-2Zn-xGa由于Mg5Ga2析出物的增加、（0001）基织构的减弱和低角晶界的数目分数的减少，晶粒更细，腐蚀速度更快。腐蚀产物呈双层结构，外层以Ca3(PO4)2为主，内层以Mg(OH)2为主。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.