Experimental characterization and finite element modeling of through thickness deformation gradient in a cold rolled zirconium sheet

Kumar, Gulshan; Lodh, Arijit; Singh, Jaiveer; Singh, Ramesh; Srivastava, D.; Dey, G.K.; Samajdar, I.

doi:10.1016/j.cirpj.2017.09.002

Cited by 13 publications

(9 citation statements)

References 53 publications

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“…An explanation of this finding is that the deformation that developed in hcp-metals (e.g., Mg, Ti, and Zr) is typically accommodated by twinning and basal slip deformation mechanisms [ 54 ]. Furthermore, as shown in Figure 6 b, the cold-rolled sample had various forms of twins, including V-shaped and deformation twins.…”

Section: Resultsmentioning

confidence: 99%

“…Towards the end of cold rolling process (300 passes), the sample had twin nuclei that overlapped with dissociated dislocation and stacking faults from the grain boundary, as presented in Figure 6b. An explanation of this finding is that the deformation that developed (e.g., Mg, Ti, and Zr) is typically accommodated by twinning and basal sl mechanisms [54]. Furthermore, as shown in Figure 6b, the cold-rolled sam forms of twins, including V-shaped and deformation twins.…”

Section: Structural Analysismentioning

confidence: 96%

“…The cold-rolling process for 300 passes provided a substantial contribution to the grain refinement of Mg-rods and Zr-rods [27,52,54], as indicated in the BF image taken by An explanation of this finding is that the deformation that developed in hcp-metals (e.g., Mg, Ti, and Zr) is typically accommodated by twinning and basal slip deformation mechanisms [54]. Furthermore, as shown in Figure 6b, the cold-rolled sample had various forms of twins, including V-shaped and deformation twins.…”

Section: Structural Analysismentioning

confidence: 99%

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Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

et al. 2021

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Magnesium hydride (MgH2) has received significant attention due to its potential applications as solid-state hydrogen storage media for useful fuel cell applications. Even though MgH2 possesses several attractive hydrogen storage properties, it cannot be utilized in fuel cell applications due to its high thermal stability and poor hydrogen uptake/release kinetics. High-energy ball milling, and mechanically-induced cold-rolling processes are the most common techniques to introduce severe plastic deformation and lattice imperfection in the Mg/MgH2. Furthermore, using one or more catalytic agents is considered a practical solution to improve both the de-/rehydrogenation process of MgH2.These treatments are usually dedicated to enhance its hydrogen storage properties and deduce its thermal stability. However, catalyzation of Mg/MgH2 powders with a desired catalytic agent using ball milling process has shown some disadvantages due to the uncontrolled distribution of the agent particles in the MgH2 powder matrix. The present study has been undertaken to employ a cold gas-dynamic spray process for catalyzing the fresh surfaces of mechanically-induced cold-rolled Mg ribbons with Ni powder particles. The starting Mg-rods were firstly heat treated and forged 200 times before cold rolling for 300 passes. The as-treated ribbons were then catalyzed by Ni particles, using cold gas-dynamic spray process. In this catalyzation approach, the Ni particles were carried by a stream of Ar gas via a high-velocity jet at a supersonic velocity. Accordingly, the pelted Ni particles penetrated the Mg-substrate ribbons, and hence created numerous micropores into the Mg, allowed the Ni particles to form a homogeneous network of catalytic active sites in Mg substrate. As the number of coating time increased to three times, the Ni concentration increased (5.28 wt.%), and this led to significant enhancement of the Mg-hydrogen storage capacity, as well as improving the de-/rehydrogenation kinetics. This is evidenced by the high value of hydrogen storage capacity (6.1 wt.% hydrogen) and the fast gas uptake kinetics (5.1 min) under moderate pressure (10 bar) and temperature (200 °C). The fabricated nanocomposite MgH2/5.28 wt.% Ni strips have shown good dehydrogenation behavior, indicated by their capability to desorb 6.1 wt.% of hydrogen gas within 11 min at 200 °C under 200 mbar of hydrogen pressure. Moreover, this system possessed long cycle-life-time, which extended to 350 h with a minimal degradation in the storage and kinetics behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Structural Analysismentioning

confidence: 96%

Section: Structural Analysismentioning

confidence: 99%

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Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

et al. 2021

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“…After this final stage of CR (150 passes), the sample possessed twin nuclei that overlapped with dissociated dislocation and stacking faults from the grain boundary, as as seen in Figure 5 b. This could be explained by the deformation that developed in hcp-metals which are typically accommodated by twinning and basal slip deformation mechanisms [ 43 ]. Moreover, the CR ribbons exhibited different types of twins, such as V-shaped, and deformation twins, as illustrated in Figure 5 b.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanically deformed Mg-ribbons obtained after 150 passes were subjected to different types of imperfections upon through RBM process. In this process, the materials were subjected to point and lattice defects, as well as severe dislocations [ 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 ], led to a dramatic reduction of the grain size. The results showed that both the grain size and T dec were linearly decreased parallel to each other upon increasing the RBM time ( Figure 12 b).…”

Section: Resultsmentioning

confidence: 99%

Solid-State Conversion of Magnesium Waste to Advanced Hydrogen-Storage Nanopowder Particles

2020

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Recycling of metallic solid-waste (SW) components has recently become one of the most attractive topics for scientific research and applications on a global scale. A considerable number of applications are proposed for utilizing metallic SW products in different applications. Utilization of SW magnesium (Mg) metal for tailoring high-hydrogen storage capacity nanoparticles has never been reported as yet. The present study demonstrates the ability to produce pure Mg ingots through a melting and casting approach from Mg-machining chips. The ingots were used as a feedstock material to produce high-quality Mg-ribbons, using a melting/casting and spinning approaches. The ribbons were then subjected to severe plastic deformation through the cold rolling technique. The as-cold roll Mg strips were then snipped into small shots before charging them into reactive ball milling. The milling process was undertaken under high-pressure of pure hydrogen gas (H2), where titanium balls were used as milling media. The final product obtained after 100 h of milling showcased excellent nanocrystalline structure and revealed high hydro/dehydrogenation kinetics at moderate temperature (275 °C). The present study shows that primer cold rolling of Mg-strips before reactive ball milling is a necessary step to prepare ultrafine magnesium hydride (MgH2) nanopowders with advanced absorption/desorption kinetics behavior. These ultrafine powders with their nanocrystalline structure are believed to play an important role in effective gas diffusion process. Moreover, the fine titanium particles came from the ball-powder-ball collisions and introduced to the Mg matrix have not only acted as micro-scaled milling media, but they played a vital catalyzation role for the process.

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Residual Stress Analysis in Titanium Alloys Used for Biomedical Applications

Kumar,

Singh

2023

Advanced Materials and Manufacturing Techniques for Biomedical Applications

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Experimental characterization and finite element modeling of through thickness deformation gradient in a cold rolled zirconium sheet

Cited by 13 publications

References 53 publications

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

Cold Gas-Dynamic Spray for Catalyzation of Plastically Deformed Mg-Strips with Ni Powder

Solid-State Conversion of Magnesium Waste to Advanced Hydrogen-Storage Nanopowder Particles

Residual Stress Analysis in Titanium Alloys Used for Biomedical Applications

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