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Investigation of structural and mechanical properties of Al-Al2O3-SiC-WS2 hybrid composites fabricated by powder metallurgy

Biswal Sweta Rani, Sahoo Seshadev

Composites Theory and Practice

2023

R. 23, nr 1

50--55

The present study focuses on the fabrication and characterization of novel hybrid Al matrix composites with a combination of two ceramic reinforcements, i.e. Al2O3, SiC and one solid lubricant, i.e. WS2. This hybrid composite was fabricated by means of the powder metallurgy process. The impact of the hybrid combination of reinforcements in different wt.% on the properties of the hybrid composites was studied. The density of the composites increases from 2.689 to 2.796 g/cm3 with an increase in wt.% of WS2. Uniform distribution of the reinforcing particles in the matrix phase was determined by SEM. The results of, for instance, density measurements and microstructural analysis indicate significant improvement in the physical and mechanical properties with the increase in the wt.% of WS2. The microhardness of the as-fabricated composites rises from 98 HV to 119.7 HV with the increase in the wt.% of WS2 from 0 to 6 wt.%. The novel combination of Al with SiC, Al2O3 and WS2 can be used to create a suitable and sustainable hybrid metal matrix composite for the automotive industry as a replacement for single ceramic and single solid lubricant composites.

Effects of TiC Addition on Strain-Induced Martensite Transformation and Mechanical Properties of Nanocrystalline Fe-Mn Alloy Fabricated by Spark Plasma Sintering

Jeon Junhyub, Choi Seunggyu, Seo Namhyuk, Moon Young Hoon, Shon In-Jin, Lee Seok-Jae

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1249--1254

The effect of TiC content on the microstructure and mechanical properties of a nanocrystalline Fe-Mn alloy was investigated by XRD analysis, TEM observation, and mechanical tests. A sintered Fe-Mn alloy sample with nano-sized crystallites was obtained using spark plasma sintering. Crystallite size, which is used as a hardening mechanism, was measured by X-ray diffraction peak analysis. It was observed that the addition of TiC influenced the average size of crystallites, resulting in a change in austenite stability. Thus, the volume fraction of austenite at room temperature afterthe sintering process was also modified by the TiC addition. The martensite transformation during cooling was suppressed by adding TiC, which lowered the martensite start temperature. The plastic behavior and the strain-induced martensite kinetics formed during plastic deformation are discussed with compressive stress-strain curves and numerical analysis for the transformation kinetics.