Solidification characteristics of atomized AlCu4Mg1-SiC composite powders

Abstract

In this study, rapidly solidified metal matrix composite powders have been produced by PREP (Plasma rotating electrode process) atomization. AlCu4Mg1 alloy is used as the matrix material while SiC particles, with about 650 nm average particle size, are used as the reinforcement phase. The microstructural and solidification characteristics of composite particles are studied using optical and scanning electron microscope (SEM). The relationship between secondary dendrite arm spacing (SDAS) and particle diameter was examined, and these composite powders were found to have dendritic and equiaxed solidification with a fine eutectic phase. SDAS measurements using various sized particles show that secondary dendrite arm spacing slightly decreases with the decrease in particle size

Effect of nickel on microstructure and wear behaviour of pure aluminium against steel and alumina counterfaces

“…1 Among these materials, aluminium alloys have been considered and studied by many researchers. [2][3][4][5][6] Owing to the weak mechanical properties of pure aluminium, many works have been performed to enhance the properties of aluminium by alloying and heat treatment. 7 Through alloying, high mechanical strength can be obtained by the formation of a fine and homogeneous distribution of intermetallic compounds, which must be stable at high temperatures.…”

Consolidation of Al-nanoSiC Composites by Spark Plasma Sintering

“…3. The production of pre-alloyed nanoSiC/Al composite powder by plasma rotating electrode process and eutectic formation are discussed elsewhere [1]. The powders produced by atomization are primarily of spherical shape, as seen in Fig.…”

“…In the light of the experimental results, the following conclusions are drawn. The eutectic phase consisting of Al 2 Cu and Mg 2 Si can be expected to affect the sintering of the composite because of the metals' lower melting point (1). Joule effect and electric discharge owed to a high heating rate were generated at the particle boundaries during spark sintering of the composite particles, local temperature of the contact point increased and eutectic melting occurred along the particle boundaries resulting in high relative density.…”

“…Metal matrix composites are attractive in many applications thanks to their unique properties [1]. A number of studies have been conducted on the effect of fine particles [2].…”

In Situ Aluminum Alloy Coating on Magnesium by Hot Pressing

“…Most of the research for automotive applications is based on Al [2][3][4]. Recently, Mg has attracted more attention in many industrial applications, primarily the automotive and aerospace industries, because it is about two-thirds as dense as Al [5,6].…”