Elastic Plastic Fracture Toughness Of Aluminium Alloy AA6061 Fly Ash Composites

Ajit Bhandakkar1*, R. C. Prasad1, Shankar M. L. Sastry2

1Department of Metallurgical Engineering and Materials Science, IIT Bombay, India

2Mechanical, Aerospace and Structural Engineering, Washington University in St. Louis, USA

Adv. Mater. Lett., 2014, 5 (9), pp 525-530

DOI: 10.5185/amlett.2014.5571

Publication Date (Web): Sep 07, 2014

E-mail: ajitbb@iitb.ac.in

Abstract


Aluminium fly ash metal matrix composites (MMCs) find important applications in aerospace and automobiles where specific stiffness is important. Low cost fly ash and silicon carbide reinforcement are widely used in aluminium metal and matrix composite due to its low density, high young modulus and strength apart from good mechanical and chemical compatibility & thermal stability. However the MMCs often suffer from low ductility, toughness and fatigue crack growth resistance relative to the matrix alloy. Linear elastic fracture mechanics (LEFM) has been used to characterize the plane strain fracture toughness using various specimen geometries and notches but very few studies using EPFM are reported in literature. In the present paper the influences of weight fraction of particulate reinforcement on tensile, fracture toughness have been evaluated. The tensile strength of aluminium fly ash composites increases with the addition of fly ash reinforcement. However the fracture toughness (KIC) of the aluminium fly ash composite decreases that of base alloy. The fracture toughness KQ of AA6061 ALFA composites varied between 13-14 MPa/m as compared to 18 MPa/m for the re-melted base alloy. Similarly the Elastic plastic fracture toughness JQ for the base alloy AA6061 lies is the range of 20-23 kJ/m2 and that of composites in the range 6-16 kJ/m2. The fracture behavior and micro-mechanism of failure in base alloy and composites have been observed under SEM and optical microscopy.

Keywords

Fracture toughness, aluminium fly ash composites, MMCs, damage mechanics

Current Issue
The Journey of a Decade to Advancing Materials
Are the Electrospun Polymers Polymeric Fibers?
Mechanical and Thermal Properties of Composite Material and Insulation for a Single Walled Tank for Cryogenic Liquids
Prediction of Long-Term Behavior for Dynamically Loaded TPU
Investigation of Doped Titanium Dioxide in Anatase Phase. Study ab initio using Density Functional Theory
Comparison between Single Al2O3 or HfO2 Single Dielectric Layers and their Nanolaminated Systems
Preparation of Stable and Optimized Antibody-gold Nanoparticle Conjugates for Point of Care Test Immunoassays
Resonance-Based Temperature Sensors using a Wafer Level Vacuum Packaged SOI MEMS Process
Integrated System Based on the Hall Sensors Incorporating Compensation of the Distortions
The Efficacy of Cinnamomum Tamala as a Potential Antimicrobial Substance against the Multi-Drug Resistant Enterococcus Faecalis from Clinical Isolates
The Effect of Complexing Reagent on Structural, Electrical and Optical Properties of CuS Thin Film
Laser Cladding of Fluorapatite Nanopowders on Ti6Al4V
Preparation and Evaluation of Sulfonate Polyethylene Glycol Borate Ester as a Modifier of Functional Properties of Complex Petroleum Lithium Grease

Upcoming Congress

Knowledge Experience at Sea TM