Characteristics of Mg-based composites synthesized using a novel mechanical disintegration and deposition technique

Abstract

In the present study, for the first time, a new technique termed "mechanical disintegration and deposition" was conceptualized and used for synthesis of Mg-based composites. Microstructural characterization studies conducted on the extruded composite samples using optical and scanning electron microscopy revealed a minimal level of porosity, uniform distribution of SiC particulates, recrystallized grain morphology, and good interfacial integrity between the metallic matrix and the reinforcement. Mechanical properties characterization conducted using a free-free beam method and servohydraulic tensile testing machine revealed that with an increasing percentage of reinforcement, there was an increase in dynamic elastic modulus and 0.2 pct yield strength (YS), a decrease in ductility, and no effect on the ultimate tensile strength (UTS). The results of the mechanical properties were then rationalized in terms of the microstructural characteristics associated with the composite samples.

Evolution in friction and wear of Mg–SiCp composites: Influence of fretting duration

“…The Mg-SiC p composites with 9.8 and 26.3 wt% SiC were produced by the mechanical disintegration method 22 and extruded into 10-mm rods. Small disks 4-5 mm thick were cut from the extruded rods.…”

Mg AZ80/SiC composite bars fabricated by infiltration of porous ceramic preforms

“…[13] Distilled water was used as the immersion fluid. The experimental densities were then compared to the theoretical rule-of-mixture densities, from which the volume fraction of retained porosity in the final composite material was calculated.…”

“…This method involved (1) suspending rods at nodal points (0.22 and 0.78 L, where L is the length of the rod) [13] using nylon threads; (2) providing excitation using a modally tuned hammer equipped with a load sensor at its tip; and (3) capturing the first mode of flexural vibration by an accelerometer located at the end of the beam. The frequency-response function (Bode plot) thus obtained was used to determine the natural frequency ( n ).…”

“…The frequency-response function (Bode plot) thus obtained was used to determine the natural frequency ( n ). The natural frequency thus obtained was used to determine the dynamic elastic modulus using the following equation: [13] [1]…”

“…More recent research into discontinuously reinforced composites has combined alumina, boron carbide, and silicon carbide whiskers, short fibers, and particles with a range of conventional magnesium alloys through varied processes involving molten metal (rheo, compo, stir, or squeeze casting and various meltinfiltration procedures), as well as powder metallurgy. [1,3,5,[11][12][13][14] Due to its extensive fluid-flow capabilities and lower melting temperature than aluminum, magnesium is an ideal material for processing via the molten or semisolid metal METALLURGICAL route. Several molten and semisolid metal processing routes for producing Mg MMCs have been investigated.…”