Influence of Cryogenic Treatment on As-Cast AZ91+1.5 wt%WC Mg-MMNC Wear Performance

Advances in Mechanical Engineering

Sahoo

Davim

2021

Magnesium matrix nanocomposites (Mg-MNCs) are high grade materials widely used in aerospace, electronics, biomedical and automotive sectors for high strength to weight ratio, excellent sustainability and superior mechanical and tribological characteristics. Basic properties of Mg-MNCs rely on type and amount of reinforcement and fabrication process. Current study reviews existing literatures to explore contribution of different parameters on tribological properties of Mg-MNCs. Effects of particle size and amount of different reinforcements like SiC, WC, Al2O3, TiB2, CNT, graphene nano platelets (GNP), graphite on tribological behaviour are discussed. Incorporation of nanoparticles generally enhances properties. Role of different fabrication processes like stir casting (SC), ultrasonic treatment casting (UST), disintegrated melt deposition (DMD), friction stir processing (FSP) on wear and friction behaviour of Mg-MNCs is also reviewed. Contributions of different tribological process parameters (sliding speed, load and sliding distance) on wear, friction and wear mechanism are also examined.

Section: Introductionmentioning

confidence: 99%

Tribological characterisation of magnesium matrix nanocomposites: A review

Advances in Mechanical Engineering

Sahoo

Davim

2021

“…Moreover, tribological properties have also enhanced significantly compared to AZ31 alloy due to incorporation of the same amount of nanoparticles. Karuppusamy et al [25,26] developed AZ91-1.5WC nanocomposite and observed excellent wear behavior at cryogenic treated condition.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Investigation of Abrasive Wear Behavior of AZ31-WC-Graphite Hybrid Nanocomposites

Sahoo

2022

Metals

In current investigation, effects of incorporation of varying amount of graphite nanoparticles on abrasive wear behavior of AZ31-WC nanocomposites are examined. AZ31-WC-Gr hybrid nanocomposites are developed using ultrasonic vibration associated stir casting technique. Developed hybrid nanocomposites are characterized using optical microscope (OM) and scanning electron microscope (SEM). Compositions of hybrid nanocomposites are investigated by energy dispersive spectroscopy (EDS). Characterization results disclose that reinforcement particles are uniformly distributed in AZ31 matrix. Compositional analysis confirms fortification of reinforcements. Microhardness values of developed hybrid nanocomposites are examined through microhardness tests. Abrasive wear behavior of AZ31 alloy and AZ31-WC-Graphite nanocomposites are investigated for varying sliding distance and varying abrasive grit size in a pin-on-disc tribotester. Abrasive wear tests disclose that incorporation of only 1 wt. % of graphite nanoparticles enhances wear resistance significantly. AZ31-2WC-1Graphite nanocomposite is found to be the most wear resistant material for all experimental conditions. Worn surfaces are scrutinized under SEM and EDS to reveal worn morphology. Investigation of worn surfaces discloses that abrasion and oxidation are main wear mechanism for AZ31-2WC-1Graphite nanocomposite tested at 50 mm track diameter and 800 grit.

“…From their study, it is revealed that grain size has decreased by 11.5%, elongation has increased by 32%-64% and hardness has improved by 66% due to addition of nano-WC. Karuppusamy et al [23] have reinforced 1.5 wt% WC nano-particle in AZ91 magnesium alloy and investigated wear behavior of cryogenic treated magnesium metal matrix nanocomposites (Mg-MMNCs). It is reported that wear loss of Mg-MMNCs have significantly reduced than base alloy at high load.…”

Section: Introductionmentioning

confidence: 99%

“…The mechanical stirrer was used for 2 min in the melt to mix the particles and homogeneous distribution of particles has been reported. Similarly, Karuppusamy et al [23] have used vacuum assisted stir casting method to incorporate WC nanoparticles in AZ91 magnesium alloy. Good distribution of WC particles is also confirmed.…”

Section: Introductionmentioning

confidence: 99%

Abrasive wear behavior of WC nanoparticle reinforced magnesium metal matrix composites

Surf. Topogr.: Metrol. Prop.

Poria²,

Sutradhar

et al. 2020

In this study, abrasive wear characteristics of AZ31-WC nanocomposites with varying weight percentage of nanoparticles (0, 0.5, 1, 1.5 & 2) are examined. AZ31-WC nanocomposites have been fabricated by ultrasonic vibration assisted stir casting method. Optical microscopy and scanning electron microscopy are employed to perform characterizations of cast composites. Density and micro hardness of nanocomposites are also investigated. Effect of abrasive grit size and sliding distance on abrasive wear behavior and friction behavior of nanocomposites are evaluated using pin-on-disc tribotester. Worn surfaces are studied with the help of 3D optical surface plotter, SEM and EDAX to find dominant wear mechanism at several experimental conditions. Microscopic observations disclose that distribution of WC nanoparticles is uniform throughout the matrix. Density and micro hardness increase with increasing percentage of WC nanoparticles. Moreover, significant improvement in wear resistance and friction behavior is observed by incorporation of WC nanoparticles. Wear resistance of Mg-2WC nanocomposite is improved around 56% than base alloy when tested with 400 grit SiC paper and 50 mm track diameter. Higher grit size abrasive paper exhibits less wear in composites. 3D Surface plots of worn surfaces show that, surface roughness is decreased with increasing wt% of WC. Surface roughness of worn surface of Mg-2WC nanocomposite tested with 800 grit, 50 mm track diameter has 35.06% less surface roughness than Mg-2WC nanocomposite tested with 400 grit, 50 mm track diameter. Investigation of worn surfaces discloses dominant mechanisms as abrasion, adhesion and delamination at several experimental conditions.