Influence of micro B4C ceramic particles addition on mechanical and wear behavior of aerospace grade Al-Li alloy composites

Aluminum matrix composites are being widely used in aircrafts due to high strength to weight ratio, good tribological properties and better castability. The B 4 C particles have low density, high hardness, high strength and stiffness. The poor wettability is major challenge during the fabrication of...

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Bibliographic Details
Published in:Sadhana (Bangalore) 2021-12, Vol.46 (1), Article 11
Main Authors: Patil, Chetan S, Ansari, Mohd Imran, Selvan, Ras, Thakur, Dineshsingh G
Format: Article
Language:English
Subjects:
Aerospace engineering
Aluminum base alloys
Aluminum boron carbide
Aluminum matrix composites
Aluminum-lithium alloys
Castability
Clustering
Engineering
Hardness
High strength
High temperature
Mechanical properties
Particulate composites
Particulates
Stiffness
Strength to weight ratio
Tribology
Ultimate tensile strength
Wear
Wettability
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Summary:Aluminum matrix composites are being widely used in aircrafts due to high strength to weight ratio, good tribological properties and better castability. The B 4 C particles have low density, high hardness, high strength and stiffness. The poor wettability is major challenge during the fabrication of Al-B 4 C composite. To overcome this problem, titanium based flux (K 2 TiF 6 ) was used to improve the wettability. In this study, structurally efficient Al-Li 8090 alloy containing 2, 5 and 10 wt% of B 4 C particles were fabricated by using modified stir casting technique with an objective to obtain homogenous dispersion of B 4 C particles in the matrix. The microstructures evaluation was done to know the distribution of particulates in the matrix. The influence of particle volume content on the mechanical and wear behavior of composites has been investigated. The ultimate tensile strength, micro and macro hardness, high temperature hardness and wear characteristics have been investigated. Ageing behavior, XRD analysis and fractography of the composites has also been studied. The outcome of the experimental investigation revealed that, 2% B 4 C particulate reinforced composite exhibits better mechanical, physical and tribological properties. 10% B 4 C particulate reinforced composite shows clustering and agglomeration at some local regions causing a drop in the properties.
ISSN:0256-2499
0973-7677
DOI:10.1007/s12046-020-01543-7