Microstructure of castings made of magnesium alloys based on recycling of the circulating scrap

Dudek, P.; Piwowońska, Justyna; Polczyk, Tomasz

doi:10.1016/j.jmrt.2021.07.113

Cited by 9 publications

(4 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Guan et al [22] reported, in their review, 72-84 and 44-65 hardness (HV) for AZ91/CNT and SiC/Mg composites, respectively. Further, Dudek et al [34] found the hardness result to be 80 HBN for Mg recycled waste composites, and similar results have been reported by other researchers [35][36][37][38]. It is evident that the hardness results in the present study reflect the previously reported results.…”

Section: Hardness and Elongationsupporting

confidence: 91%

Comprehensive Study on the Properties of AZ91/x-Si3N4 Composites for Their Prospective Application

Alam,

Ahmad,

Alshoaibi

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

Metal alloy matrix composites are generally lightweight structural materials with a high strength-to-weight ratio. They can be extensively used in various fields of modern engineering applications, such as aerospace and automotive components and biomedical engineering. This study focuses on the development and characterization of lightweight metal alloy matrix composites for industrial applications, with a particular emphasis on magnesium (Mg) alloys as a replacement for aluminum-based alloys. Mg alloys offer significant weight advantages, being 33% lighter than aluminum and 75% lighter than steel, making them highly desirable for use in various engineering fields. In the present study, Mg (AZ91) alloy reinforced with x-Si3N4 composites (x = 0, 1, 3, 5, 7, 9 wt.%) were fabricated using a liquid state process. The AZ91/x-Si3N4 composites were evaluated through physical, mechanical, wear, and microstructural characterization. The experimental results, supported by statistical analysis, demonstrated that the incorporation of Si3N4 particles amplified the mechanical properties, wear resistance, and porosity of the composites. However, the presence of the reinforced particles resulted in reduced forgeability and elongation, limiting certain deformation characteristics. The existence of the reinforced particles within the composites was confirmed through SEM analysis, providing visual evidence of their distribution and interaction within the Mg alloy matrix. Finally, it was concluded that the implication of the study could be sought for the light structural parts of aerospace, automotive, biomedical, and prosthetic applications.

show abstract

Section: Hardness and Elongationsupporting

confidence: 91%

Comprehensive Study on the Properties of AZ91/x-Si3N4 Composites for Their Prospective Application

Alam,

Ahmad,

Alshoaibi

et al. 2024

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…Figure . 2 shows a series of microstructural images of Mg scrap, its ingot forms and AZ31B Mg alloy. As can be seen in this Figure , the microstructures of all these materials were apparently similar, showing typical granular grain of Mg-Al-Zn alloy [7]. The microstructure of ingot with and without de-coating in this research are actually hard to be distinguished.…”

Section: Resultsmentioning

confidence: 64%

“…Actually, Mg and its alloys are hard to be recycled by remelting process, mainly because of their high reactivity with oxygen and susceptibility to fire-up below their melting temperature [7,8]. In addition, contamination of Mg and its alloy scraps due to the previous product processing, such as coating and painting, also caused difficulty in acquiring high-quality diecasted ingots that could meet ASTM standard [6].…”

Section: Graphical Abstract 1 Introductionmentioning

confidence: 99%

Recycling of Magnesium Alloy Scrap by Remelting and Chemical De-coating Process

Arifvianto,

Santoso,

Rajagukguk

et al. 2023

Metall Mater Eng

View full text Add to dashboard Cite

The growing demands of magnesium (Mg) based materials had risen new challenges related to disposal of unused parts and a huge amount of waste made by such metals. Attempts to recycle the scrap of these materials through remelting had become one of the preferred choices. However, a series of preliminary steps should be carried out to reduce the impurities as well as to maintain the quality of the casted ingot, for instance, by applying de-coating for removing paints or coating substrates at the scrap surface prior to remelting. In this research, the effects of chemical reagent de-coating on the properties of ingot obtained from recycling Mg scrap were studied. A commercial paint removal liquid was preferred as the reagent for removing paint layers over the Mg scrap surface. The de-coated scrap was then remelted in a conventional furnace with NaCl powder as the fluxing layer. The results of this study noticed the importance of chemical de-coating process to reduce the impurity contents in the ingot which might be originated from the coating or paint substrates covering the Mg scrap. Meanwhile, the density and hardness of the Mg ingot processed without de-coating were obviously higher than that had been cleaned previously with paint removing agent.

show abstract

“…Asgari et al [18] recycled and cleaned AZ91 alloy chips and fabricated SiC particle-reinforced magnesium matrix composites by melting and stirring using the stir casting method, realizing the sustainable use of waste magnesium chips. However, magnesium alloys are highly reactive and flammable [19], posing challenges to the remelting process. During remelting, magnesium alloys are prone to react with oxygen, moisture, and impurities to generate slag [20], which reduces melting efficiency and affects alloy properties.…”

Section: Introductionmentioning

confidence: 99%

Solid-State Synthesis of SiC Particle-Reinforced AZ91D Composites: Microstructure and Reinforcement Mechanisms

Shi,

Cui,

et al. 2024

Metals

View full text Add to dashboard Cite

Safe and efficient recycling of industrially generated machined chips is a high-priority technological issue. In this study, the effect of SiC particles (SiCp) on the microstructure and mechanical properties of SiCp/AZ91D composites is systematically analyzed, and the reinforcement mechanism of SiCp on composites is investigated. Different contents of SiCp/AZ91D composites are fabricated by solid-state synthesis. The results show that the incorporation of SiCp refined the grains of SiCp/AZ91D composites, which is related to the uniform distribution of SiCp at the grain boundaries. The strong bonding of SiCp with the AZ91D matrix inhibited the generation and extension of cracks, which led to the simultaneous increase in the yield strength (YS) and elongation (EL) of the SiCp/AZ91D composites. The mechanical properties of the 3 wt.% SiCp/AZ91D composites are the most superior, with an average grain size, Vickers hardness, ultimate tensile strength (UTS), YS, and EL of 6.69 ± 4.48 μm, 89.5 ± 2.5 HV, 341 ± 11 MPa, 172 ± 8 MPa, and 4.43 ± 0.18%, respectively. The reinforcement mechanisms of SiCp/AZ91D composites are mainly grain refinement and dislocation strengthening. Solid-state synthesis is an effective method for recycling magnesium alloy chips.

show abstract

Microstructure of castings made of magnesium alloys based on recycling of the circulating scrap

Cited by 9 publications

References 25 publications

Comprehensive Study on the Properties of AZ91/x-Si3N4 Composites for Their Prospective Application

Comprehensive Study on the Properties of AZ91/x-Si3N4 Composites for Their Prospective Application

Recycling of Magnesium Alloy Scrap by Remelting and Chemical De-coating Process

Solid-State Synthesis of SiC Particle-Reinforced AZ91D Composites: Microstructure and Reinforcement Mechanisms

Contact Info

Product

Resources

About