As you read this story, you will learn the following:
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Magnesium is the lightest structural metal and is known for its versatile component in some of the world’s most advanced technologies.
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A new study improves on the versatility of pure magnesium by mixing it with an atypical material: dried leaf powder.
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This dried leaf powder, an agricultural waste byproduct of mangoes, improves the metal’s damping capabilities without sacrificing its strength or durability.
The world relies on magnesium, but it’s not a metal that usually makes headlines. Steel forms the structural backbone of the world’s tallest buildings, the world’s most advanced aircraft are clad in aluminum, and titanium forms a key component of most space rockets. However, behind many of these metallic wonders lies magnesium, the lightest structural metal in use today. Pure magnesium is 30% lighter than aluminum, and alloys made from aluminum have higher melting points, making them ideal for the automotive and aircraft industries. Magnesium is found in most aluminum beverage cans at about 5%.
Now, scientists from the National University of Singapore have come up with a unique “alloy” that combines fallen leaves (agricultural waste from mango crops) with pure magnesium. Surprisingly, magnesium alloys made with leaf powder had a staggering 54% improvement in damping capacity (that is, their ability to withstand vibration) compared to pure magnesium. Research results published in diary Metal.
“[Magnesium] “It has gained widespread interest in industrial and biomedical applications due to its high specific strength, good machinability, excellent damping capabilities, and natural richness,” the authors write. “Converted biomass materials, such as leaf powder, have shown promising potential in applications as diverse as ceramics, catalysts, supercapacitors, and even microwave absorbing materials.”
With these two ideas in mind, and the fact that scientists have been eager to find ways to reduce the weight of magnesium alloys without sacrificing performance, the team thought they would see if leaf-like biomass could bring benefits to magnesium composites. To achieve this breakthrough, the research team simply collected fallen leaves from mango trees (mango) and dry them using a microwave (also not a fancy lab microwave, just a standard Sharp convection oven). The leaves are then ball milled and dried in an oven to obtain dry leaf powder.
The powder is then incorporated into the magnesium, making up just 5% of the final mixture. During the sintering process, a manufacturing technique that uses pressure and heat to transform powdered metal into a dense structure, the dry powder evaporates, leaving behind tiny pores. Although there are holes in the metal possible As worrisome as it sounds, it turns out these pores make the new and improved magnesium more shock-absorbent.
To form the best material, scientists must find the perfect temperature for the extrusion process. Too hot and the heated plant powder will turn into carbon, which will intensify rust. On the other hand, being too cold can have negative effects.
“Mechanical properties show a trade-off with reduced extrusion temperature: lower temperatures lead to increased porosity and thus reduced hardness, compressive strength, and ductility,” the authors wrote.
They found that extrusion at around 350 degrees Celsius produced the best results for the magnesium dry leaf powder mixture, as it kept the metal particles tight and dense, allowing the final product to resist bending.
“These findings not only highlight the potential of incorporating natural biomass into metallic systems to develop lightweight and sustainable materials, but also provide a solid foundation for future research into the design, processing optimization, and performance enhancement of metallic biomass composites while minimizing potential limitations,” the authors wrote.
Magnesium is already one of the most versatile alloy components, but scientists have shown that its miraculous compounding abilities are beyond our imagination.
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