chemical heterogeneity Archives - Archès Lab

Exploring the bonding mechanism in cold spray deposition of engineered graphene nanoplates-Ni nanocomposite powder

Roberta Falco — Wed, 29 Jan 2025 08:58:51 +0000

We are happy to share the most recent publication from Archès Lab in Atomistic understanding of physic behind the Cold Spray of Graphene-Ni nanocomposite powders:

“Exploring the bonding mechanism in cold spray deposition of engineered graphene nanoplates-Ni nanocomposite powder“

Graphene’s excellent properties make it an ideal reinforcement for Metal Matrix Composites (MMCs), enhancing strength, elasticity, and thermal conductivity. Traditional manufacturing methods like powder metallurgy and additive manufacturing require high temperatures, risking damage to graphene. Cold spray (CS) offers a promising alternative, operating at low temperatures to deposit composites with minimal oxidation and particle coarsening, resulting in improved wear resistance and friction properties. However, the bonding mechanisms between graphene nanoplatelets (GNPs) and the metal matrix, as well as the effects of GNP content and particle velocity, are not fully understood. Molecular dynamics (MD) simulations, by examining the processes at the atomic level, can provide crucial insights into these interactions, making them a powerful tool for optimizing CS-based GNP-MMC production.

This study employs molecular dynamics simulations to examine the cold spray process of a single graphene-Ni composite powder particle impacting a Ni substrate, with the aim of gaining deeper insights into the underlying bonding mechanisms of such materials. The effect of impact velocity on deposition is investigated by testing velocities ranging from 300 to 1500 m/s, focusing on common cold spray phenomena such as bounce-off and plastic deformation. Furthermore, the research explores the impact of varying graphene content on the metal-metal bonding phenomenon, enhancing the practical relevance of the study. As a further advancement, microstructural changes during the plastic deformation of composite powders are monitored through particle-on-particle deposition simulations.

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Current Trends and Future Perspective for Cold SprayMetal-Ceramic Composites

Roberta Falco — Tue, 21 Jan 2025 13:26:28 +0000

We are happy to share a new publication from Archès Lab in Advanced Engineering Materials: “Current Trends and Future Perspective for Cold SprayMetal-Ceramic Composites”.

Cermet materials comprising ceramic and metallic constituents demonstratesuperior mechanical properties, rendering them highly appropriate for dem-anding applications. Studies have shown that cold spray (CS) technology is a viable method for producing cermet coatings and components. CS effectively embeds the ceramic phase, which acts as reinforcement, within the metallic matrix. The paper presents a comprehensive review of diverse aspects of cermet depositsobtained using CS technology.

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Advancing the next generation of high-performance metal matrix composites through metal particle reinforcement

Roberta Falco — Thu, 28 Nov 2024 09:52:22 +0000

We are happy to share the most recent publication from Archès Lab in Advanced Composites and Hybrid Materials:

“Advancing the next generation of high-performance metal matrix composites through metal particle reinforcement“

Metal matrix composites (MMCs) offer a significant boost to achieve a wide range of advanced mechanical properties and improved performance for a variety of demanding applications. The addition of metal particles as reinforcement in MMCs is an exciting alternative to conventional ceramic reinforcements, which suffer from numerous shortcomings. Over the last two decades, various categories of metal particles, i.e., intermetallics, bulk metallic glasses, high-entropy alloys, and shape memory alloys, have become popular as reinforcement choices for MMCs.

These groups of metal particles offer a combination of outstanding physico-mechanical properties leading to unprecedented performances; moreover, they are significantly more compatible with the metal matrices compared to traditional ceramic reinforcements. In this review paper, the recent developments in MMCs are investigated. The importance of understanding the active mechanisms at the interface of the matrix and the reinforcement is highlighted. Moreover, the processing techniques required to manufacture high-performance MMCs are explored identifying the potential structural and functional applications. Finally, the potential advantages and current challenges associated with the use of each reinforcement category and the future developments are critically discussed. Based on the reported results, the use of metal particles as reinforcement in MMCs offers a promising avenue for the development of advanced materials with novel mechanical properties. Further progress requires more in-depth fundamental research to realize the active reinforcing mechanisms at the atomic level to precisely identify, understand, and tailor the properties of the integrated composite materials.

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