Wyniki wyszukiwania - BazTech

1

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

EN

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.

2

Experimental investigations of microstructural and mechanical behaviour of aluminium alloy 7075 hybrid nanocomposites

Kishore K.L., Padal Balaram K.T., Ranga Raju D.

Composites Theory and Practice

|

2023

|

R. 23, nr 4

226--234

EN

In this paper, the microstructural and mechanical characterisation of hybrid composites with a metal matrix was conducted. Al2O3 nanoparticles and CNTs were added to strengthen an aluminium alloy (AA 7075) using solid-state powder metallurgy. Utilizing XRD analysis and scanning electron microscope (SEM), microstructural characterization was carried out. Uniaxial compression and microhardness testing were performed to determine how the hybrid composites behaved mechanically. The microstructural research revealed that the nanoparticle dispersion in the matrix is uniform. The XRD plots and the Williamson-Hall equation were used to evaluate the crystallite size, lattice strain and dislocation density. In comparison to the base alloy, the composites have better strength and micro hardness.

3

Experimental analysis on surface roughness in turning hybrid metal matrix (6061Al+SiC+Gr) composites

Kathirvel M., Palani Kumar K., Diaz P. M.

Mechanics and Mechanical Engineering

|

2018

|

Vol. 22, nr 1

341--356

EN

Owing to the distinguished properties Metal Matrix Graphite Hybrid Composites (Al/SiCMMC-Gr) are used in various applications. This paper deals with the utility of Taguchi and response surface methodologies for the prediction of surface roughness in tuning of these materials with PCD tool. The cutting parameters effect on surface quality is analyzed and an empirical model with respect to turning parameters is established using response surface method. The most important parameter that influences the turning Al/SiC-MMC-Gr is feed. The measured and predicted results are approximately equal, which proves that, model is to be used for predicting surface finish in turning of these composites. Validation experiments have been used to confirm the predicted results.