Impression creep behavior of different zones in friction stir welded ZE41 magnesium-rare earth alloy

Ebenezer, D. D.; Rao, S. R. Koteswara; Harikrishna, K. L.; Reddy, G. Madhusudhan

doi:10.1016/j.msea.2022.143615

Cited by 10 publications

(5 citation statements)

References 59 publications

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“…However, a joint efficiency of over 75% was observed in both 5-mm welds. The occurrence of tensile failures at the advancing-side nugget/HAZ interface appears to be a common characteristic in magnesium alloy friction stir welds, as reported in various studies [32,33]. During friction stir welding, the intense heat and mechanical stirring can alter the microstructure of the material at the nugget/HAZ interface, which may weaken due to the fragmentation of brittle-phase intermetallic materials [38].…”

Section: Mechanical and Microstructural Properties Of Zm21 And Ze41 M...mentioning

confidence: 86%

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A surface and corrosion characterisation of micro arc oxidation treated friction stir welded ZM21 and ZE41 magnesium alloy: a comparison study

Monish,

Hari Krishna,

Rajkumar

2024

Phys. Scr.

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Magnesium alloys have gained attention as promising materials in industrial applications, for their high specific strength and low density. Magnesium alloys have desirable mechanical properties, but their poor corrosion resistance prevents their safe implementation. Alloys such as ZM21 and ZE41, possess unique properties that provide improved machinability and increased red-hot strength, respectively, while remaining prone to corrosion. To improve corrosion resistance, surface treatments and coating processes are employed. Comparing the corrosion characteristics of ZM21 and ZE41 is vital for aerospace and automotive applications, directly affecting component durability, reliability, and performance against corrosion. Magnesium alloys are frequently joined through friction stir welding (FSW), hence, similar importance is provided to studying the corrosion performance of welds, since FSW introduces microstructural changes that alter corrosion performance of welded joints. The paper discusses electrochemical corrosion mechanisms and analyzes the effect of Micro Arc Oxidation (MAO) coating on electrode potential, passivity, and electrical resistance of ZM21 and ZE41 plates welded through FSW. MAO treatments were performed on both base material and FSW joints. The corrosion performance of MAO-coated FSWed ZM21 and ZE41 alloys was compared through the Electrochemical Impedance Spectroscopy (EIS) and Potentio-Dynamic Polarisation (PDP) tests. The PDP test revealed that MAO treatment enhanced the corrosion resistance of both base and FSWed ZM21 and ZE41 magnesium alloys. There was an improvement in potential polarization (Rp) values from 565 Ω cm2 to 11245 Ω cm2 for ZM21 and from 1184.4 Ω cm2 to 11435.69 Ω cm2 for ZE41 alloys. While exhibiting improvements in corrosion resistance, MAO-treated ZE41 performed better than MAO-treated ZM21. PDP results were verified through confirmatory EIS results. Therefore, MAO treatments are effective methods to improve the corrosion performance of Mg alloys. Evaluation of MAO coating performance on various FSW Mg alloys and studying their corrosion performance is crucial for engineering material selection.

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Section: Mechanical and Microstructural Properties Of Zm21 And Ze41 M...mentioning

confidence: 86%

“…In the present comparison study, the base materials used include plates of ZM21 [32] and ZE41 [33] magnesium alloys. Both the ZM21 and ZE41 magnesium alloy plates had a geometric dimension of 150 × 75 × 5 mm.…”

Section: Experimental Procedures 21 Preparation Of Fsw Samplesmentioning

confidence: 99%

A surface and corrosion characterisation of micro arc oxidation treated friction stir welded ZM21 and ZE41 magnesium alloy: a comparison study

Monish,

Hari Krishna,

Rajkumar

2024

Phys. Scr.

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“…The material in its solid state is modified when the deformed material is transported from the retreating side (RS) to the advancing side (AS) of the tool pin and is forged by the tool shoulder. FSP has the capability to improve the characteristics of a material, such as creep resistance, ultimate tensile strength, yield strength, and hardness [46]. The most crucial region in the FSP process is between the stir zone and the thermo-mechanically impacted zone (TMAZ).…”

Section: A Review Of the Effects Of Various Fabrication Methods For M...mentioning

confidence: 99%

Manufacturing and characterisation of magnesium composites reinforced by nanoparticles: A review

Monish¹,

KL²,

Rajkumar³

2023

Materials Science and Technology

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Magnesium metal matrix composites (Mg-MMC) are versatile materials notable for their utilisation in automotive, aerospace, and manufacturing sectors due to their superior mechanical properties and high specific strength. Nanoparticle reinforcements at varying concentrations are used to improve the mechanical and tribological properties of the Mg alloy. In this paper, the effects of varying nanoparticles (namely silicon carbide, carbon nanotubes, titanium nanoparticles, and tungsten carbide) on different Mg alloys are discussed along with relevant manufacturing processes. From the literatures, Mg-MMCs are fabricated from AZ91 alloy with silicon carbide nanoparticle reinforcement of 1 wt-% composition, manufactured using ultrasonic-assisted stirring, which showed the best relationship in overall material properties over other nanoparticle reinforcements.

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“…Welding is one of the joining processes in which the metal plates are joined by heating the contact surfaces. The conventional method of welding magnesium alloys results in cracks, porosity, and other defects due to the low melting point and the significant thermal expansion of magnesium and its alloys [35,36]. These drawbacks are overcome by joining the Mg alloy plates through the Friction Stir Welding process (FSW).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and corrosion characteristics of micro-arc oxidized magnesium alloy (ZE41) friction stir welds in modified SBF

Sivashanmugam,

Harikrishna,

Rao

et al. 2023

Phys. Scr.

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Magnesium is a popularly known class of biodegradable metallic biomaterials, and it has spent most of its time in corrosion environments that must be validated before it can be used in real bio applications. This work studies the adaptability of rare earth magnesium alloy (Mg-RE) ZE41 welds for in vitro bio applications. Magnesium rare earth ZE41 alloy plates were welded through a friction stir joining process. The fabrication of a defect-free and strong friction stir butt joint was confirmed by microscopic analysis and mechanical tests. The joint efficiency of 79.25% was arrived from the tensile test based on ultimate tensile strength (UTS). The microhardness at WN, HAZ and base material were measured as 82, 63, and 70 respectively. A silicate electrolyte-based micro-arc oxidation (MAO) coating process was carried out on base and weld samples to study the corrosion behaviour of uncoated and coated samples in modified simulated body fluid (m-SBF). The average coating thickness of the samples was 40 µm. Then the processed samples were immersed in the m-SBF solution for 0.25 h, 72 h, and 168 h, and the degradation behaviour of all the samples was studied. The surface morphology and compositions were analysed through X-Ray diffraction and field emission scanning electron microscopy (FE-SEM) on all the MAO-coated and uncoated bases as well as weld samples. The electrochemical impedance spectroscopy (EIS) and potentiodynamic polarisation (PDP) tests were employed to evaluate the electro-chemical induced corrosion behaviour of the samples. The results revealed that MAO-coated ZE41 welded samples have better corrosion mitigation properties with a corrosion rate of 12.45 mpy after 168h of immersion than all other counterparts due to the compact oxide layer formation and further apatite mineral phase deposition that helps to delay the surface degradation of friction stir welded ZE41.

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Impression creep behavior of different zones in friction stir welded ZE41 magnesium-rare earth alloy

Cited by 10 publications

References 59 publications

A surface and corrosion characterisation of micro arc oxidation treated friction stir welded ZM21 and ZE41 magnesium alloy: a comparison study

A surface and corrosion characterisation of micro arc oxidation treated friction stir welded ZM21 and ZE41 magnesium alloy: a comparison study

Manufacturing and characterisation of magnesium composites reinforced by nanoparticles: A review

Mechanical and corrosion characteristics of micro-arc oxidized magnesium alloy (ZE41) friction stir welds in modified SBF

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