A review on friction stir processing over other surface modification processing techniques of magnesium alloys

IF 3.1 Q2 MATERIALS SCIENCE, COMPOSITES Functional Composites and Structures Pub Date : 2022-01-11 DOI:10.1088/2631-6331/ac49f3
Siddesh Kumar N M, C. S, Talluri Nikhil, Dhruthi
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引用次数: 2

Abstract

An enormous amount of research has been conducted on aluminium alloys in friction stir processing (FSP), despite magnesium alloys reporting severe weight reduction when compared to aluminium alloys; a very slight amount of research has testified for FSP of magnesium alloys. Magnesium is highly reactive and susceptible to corrosion in the presence of an aggressive environment. This highly corrosive nature of magnesium limits its applications. Surface properties like crystal structure, composition, and microstructure influence the corrosion and wear properties of the material. Coating techniques and alloying techniques like laser surface modifications are performed to passivate the magnesium surface from corrosion. Coating techniques, however, have been found to be insufficient in corrosion protection due to coating defects like pores, cracks, etc, adhesion problems due to poor surface preparation of the substrate, and impurities present in the coating which provide microgalvanic cells for corrosion. The current study gives a detailed overview of different types of surface modification methods, such as physical vapour deposition, chemical vapour deposition, chemical conversion coating, and ion implantation coating techniques, and also focuses on a few alloying or surface processing methods, such as laser surface modification – namely laser surface melting, laser surface cladding, laser shot peening, laser surface alloying and FSP. FSP is a novel surface modification method derived from friction stir welding, which modifies the microstructure and composition of surface layer without changing the bulk properties to enhance corrosion resistance. FSP enhances and homogenizes the microstructure but also eliminates the breakup of the brittle-network phases and cast microstructure imperfections. Indeed, FSP can produce particle and fibre-reinforced magnesium-based surface composites. FSP empowers the manufacturing of magnesium by adding additives. The different methods of coating and surface modification are compared with FSP.
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评述了搅拌摩擦法在镁合金表面改性中的应用
尽管与铝合金相比,镁合金的重量显著减轻,但仍对搅拌摩擦加工(FSP)中的铝合金进行了大量研究;很少的研究证实了镁合金的FSP。镁具有高度的反应性,在腐蚀性环境中易受腐蚀。镁的这种高度腐蚀性限制了其应用。晶体结构、成分和微观结构等表面特性会影响材料的腐蚀和磨损性能。进行涂层技术和合金化技术,如激光表面改性,以钝化镁表面免受腐蚀。然而,由于涂层缺陷(如孔隙、裂纹等)、基底表面制备不良导致的粘附问题以及涂层中存在的杂质(为腐蚀提供微硅电池),已经发现涂层技术在防腐方面不足。目前的研究详细概述了不同类型的表面改性方法,如物理气相沉积、化学气相沉积,化学转化涂层和离子注入涂层技术,还重点介绍了几种合金化或表面处理方法,如激光表面改性,即激光表面熔化、激光表面包层,激光喷丸、激光表面合金化和FSP。FSP是一种源自搅拌摩擦焊的新型表面改性方法,它在不改变本体性能的情况下改变表面层的微观结构和成分,以提高耐腐蚀性。FSP增强并均匀化了微观结构,但也消除了脆性网络相的破裂和铸造微观结构缺陷。事实上,FSP可以生产颗粒和纤维增强的镁基表面复合材料。FSP通过添加添加剂使镁的制造成为可能。将不同的涂层和表面改性方法与FSP进行了比较。
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来源期刊
Functional Composites and Structures
Functional Composites and Structures Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
10.70%
发文量
33
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