Influence of B 4 C Reinforcement Particles with Varying Sizes on the Tensile Failure and Fractography of LM29 Alloy Comp
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TECHNICAL ARTICLE—PEER-REVIEWED
Influence of B4C Reinforcement Particles with Varying Sizes on the Tensile Failure and Fractography of LM29 Alloy Composites G. Pathalinga Prasad . H. C. Chittappa . Madeva Nagaral
. V. Auradi
Submitted: 22 February 2020 / in revised form: 14 July 2020 / Accepted: 3 September 2020 Ó ASM International 2020
Abstract In the present work, an attempt has been made to study the mechanical behavior and tensile fractography of 40- and 90-micron-sized boron carbide (B4C) particulate-reinforced light metal (LM) 29 alloy composites. LM29 alloy with 3, 6 and 9 wt. % of 40- and 90-micronsized B4C composites was synthesized by liquid stir method. Microstructural analyses were obtained by using scanning electron micrographs and energy-dispersive spectrographs. Mechanical properties like hardness, ultimate, yield strength and ductility were evaluated as per American Society for Testing and Materials standards. Scanning electron microscope micrographs show the even dispersal of B4C particulates in the LM29 alloy, and this is confirmed by energy-dispersive spectroscopy analysis. Further, hardness, ultimate and yield strength of matrix LM29 alloy were enriched with the addition of B4C reinforcement and were more in the case of 40-micron-sized reinforced composites. There was small decrease in ductility of composites in both cases.
G. P. Prasad Department of Mechanical Engineering, AMC College of Engineering, Bangalore 560083, India H. C. Chittappa Department of Mechanical Engineering, UVCE, Bangalore 560001, India M. Nagaral (&) Aircraft Research and Design Centre, Hindustan Aeronautics Limited, Bangalore 560037, India e-mail: [email protected] V. Auradi Department of Mechanical Engineering, Siddaganga Institute of Technology, Tumakuru 587103, India
Keywords LM29 alloy Micro B4C Microstructure Tensile failure Fractography
Introduction Much of the progress in the field of metal composites is closely linked to developments in reinforcements for incorporation in MMCs. To date, the achievement of higher strength and stiffness has been the prime object behind the progress of metal composites. Other important parameters such as damping capacity, component weight, wear resistance, coefficient of thermal extension and high temperature capabilities can be obtained by suitable combinations of filler materials in metallic matrices [1, 2] Metal matrix composites (MMCs) have risen as a vital course of materials for basic structural and wear applications, basically because of their capacity to display better quality than weight-strength to cost proportions when contrasted with identical monolithic materials [3, 4]. Among MMCs, aluminum metal matrix composites (AMMCs) are considered as a gathering of new propelled materials for its lightweight, high explicit modulus, low coefficient of thermal extension and great wear opposition properties [5, 6]. In particulate-reinforced aluminum matrix composites (PAMCs), the ceramic fortifications are in the form of oxides or carbides/borides, for example, al
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