Progress of Flake Powder Metallurgy Research

Abstract

This paper reviewed several recent progresses of the new powder metallurgy technology known as flake powder metallurgy (FPM) including different processing routes, conventional FPM (C-FPM), slurry blending (SB), shift-speed ball milling (SSBM), and high-shear pre-dispersion and SSBM (HSPD/SSBM). The name of FPM was derived from the use of flake metal powders obtained by low-speed ball milling (LSBM) from spherical powder. In this case, the uniformity of reinforcement distribution leads to increased strength and ductility. Powder is the basic unit in PM, especially advanced PM, and its control is key to various new PM technologies. The FPM is a typical method for finely controlling the powder shape through low-energy ball milling (LEBM) to realize the preparation of advanced material structures. The present paper represents a review of the main results of research on FPM and indicates the potential for future studies devoted to the optimization of this processing route.

A Quantitative Investigation of Dislocation Density in an Al Matrix Composite Produced by a Combination of Micro-/Macro-Rolling

“…In addition, since MMR process typically provide an elongated UFG microstructure in longitudinal direction [5,6,[13][14][15], therefore, the geometry effect should to be take into account in the calculation. To this end, influences of geometry of deformation on the density of HAGBs is studied by Razavi et al [68] and a technique is proposed to calculate this effect.…”

“…As an effective way of improving material properties, especially mechanical strength and ductility, severe plastic deformation techniques have been proposed [6,[9][10][11][12]. Powder metallurgy (PM) by means of low-speed ball milling (LSBM) has been reported as a beneficial approach for preparing CNT/Al with CNT dispersion with a high level of uniformity by means of changing the spherical ductile metal powders into flake-shaped building blocks (the flake PM approach) [5,6,[13][14][15]. During the cold-welding stage, the flaky powders are cold-welded into a lamellar structure, and the CNTs are introduced into the ductile powders.…”

“…In fact, PM technology, especially flake PM, is regarded as being a high-efficiency method of mass production, and is able to disperse reinforcement additives homogeneously in the Al matrix and balance the strength and ductility of the composites. In addition, by considering a number of innovative flake PM technologies, such as macro-/micro-rolling [13,16], shift ball milling speed [5,14], etc. [4,17,20,21], other advantages of FPM such as the development of approaches that are feasible and cost-effective, are attainable.…”

Effects of Process Control Agent Amount, Milling Time, and Annealing Heat Treatment on the Microstructure of AlCrCuFeNi High-Entropy Alloy Synthesized through Mechanical Alloying

“…During milling, the morphology of particles with a soft matrix changes to a plate-like morphology, and then, with increase in deformation and occurrence of work hardening and brittleness, these plate-like particles break into smaller particles [16,18,33]. However, increment of PCA amount leads to lower deformation and work hardening in particles Figure 3 illustrates the SEM images of the powders synthesized in the presence of different amounts of PCA with different magnifications.…”

Fabrication of Pressure Conductive Silicone Rubber Socket Device by Shape-Controlled Nickel Powders Produced by High-Energy Ball Milling

“…In addition, the studies reported that horizontal-type milling is advantageous to accomplish the homogeneous distribution of the powder as compared to vertical-type milling systems such as the attritor milling system in which the powder segregation occurs (dead-zone formation) due to the gravity effect [ 19 ]. The evolution of microstructure could be controlled by the milling parameters, especially the milling speed [ 20 ]. In this study, the flake-shaped Ni powders are produced through a horizontal-type high-energy ball milling process.…”