Microstructure characterization of nanocrystalline Fe3C synthesized by high-energy ball milling

Mechanosynthesis of nanocrystalline titanium nitride and its microstructure characterization

“…The initial reduction and then increment of particle size value with increasing milling time is due to well known fracture and re-welding mechanism of nanocrystalline particles. This mechanism of mechanosynthesis of powder materials by high-energy ball-milling is observed by several authors and also by us during the preparation of nanocrystalline ceramics [13][14][15][16].…”

“…Formation of nanocrystals in ball-milling process by fracture and re-welding mechanism results in huge amount of structural and microstructural defects, and accumulation of these lattice imperfections sometimes may lead to phase transformation in nanocrystals. To estimate the lattice imperfections and their nature in order to find the reason for phase transformation in ballmilled nanocrystalline material, X-ray characterization technique based on structure and microstructure refinement is usually preferred [13][14][15][16]. Physical properties of materials are related to the microstructure parameters and thereby controlling the microstructure, materials can be designed according to desirable properties.…”

Microstructural characterization of nanocrystalline SiC synthesized by high-energy ball-milling

“…Due to low X-ray scattering power of thin graphite layers, no graphite reflection was detected in the XRD patterns of samples milled for more than 3 h. Disappearance of graphite reflections at early stage of milling is a common phenomenon in mechanosynthesized metal carbides like Fe 3 C, Ni 3 C, etc. [14,15]. Though there is no appreciable change in peak positions but both peak broadening and peak-asymmetry of Si reflections increase continuously with increasing milling time.…”

“…Usually, metal carbides are prepared by conventional powder metallurgy route, liquid phase sintering technique [4,5], solid vapor reaction process [6] or chemical vapor reaction [7] which requires a very high temperature as well as good vacuum condition or ultra-pure inert gas atmosphere. One 'top down' physical method for preparing homogeneous nanocrystalline metal carbides is mechanical alloying (MA) [3,[8][9][10][11][12][13][14][15][16][17]. MA has the advantages over other fabrications techniques as the final product takes a nanocrystalline structure with superior properties in comparison to conventional coarse grained materials.…”

Diverse Role of Silicon Carbide in the Domain of Nanomaterials

“…One "top down" physical method for preparing homogeneous nanocrystalline metal carbides is mechanical alloying (MA) [75][76][77][78][79][80][81][82][83][84][85]. MA has the advantages over other fabrications techniques as the final product takes a nanocrystalline structure with superior properties in comparison to conventional coarse grained materials.…”