NDLI: Fabrication of two-layered Al-B$_{4}$C composites by conventional hot pressing uuder nitrogen atmosphere and their characterization

Content Provider	Springer Nature Link
Author	Bedir, Fevzi
Copyright Year	2006
Abstract	In this study, we describe the conventional hot pressing (CHP) of layered Al-B$_{4}$C composites and their characterization. The matrix alloy A1-5 wt.%Cu was prepared from elemental powder mixtures. The metal and B$_{4}$C powders were mixed to produce either Al-Cu-10vol.%B$_{4}$C or Al-Cu-30vol.%B$_{4}$C combinations. Then, these powder mixtures were stacked as layers in the hot pressing die to form a two-layered composite. Hot pressing was carried out under nitrogen atmosphere to produce 30×40×5 mm specimens. Microstructural features and age hardening characteristics of composites were determined by specimens cut longitudinally. The flexural strength of both layered composites and their monolithic counterparts were investigated via three point bending tests. In the case of layered specimens of both 10vol.%B$_{4}$C and 30vol.%B$_{4}$C containing layers were loaded for three-point test. The results show that a homogeneous distribution of B$_{4}$C particles in the matrix alloy which is free of pores, can be obtained by CHP method. The ageing behavior of the composites was found to be influenced by the reinforced materials, i.e. higher hardness values were reached in 8 hrs for the composites than that for the matrix alloy. Flexural strength test showed that two-layered composites exhibited improved damage tolerance depending on layer arrangement. Microstructural investigation of the fracture surfaces of the bending specimens was performed by means of scanning electron microscope (SEM). While layer with lower reinforcement content exhibited large plastic deformation under loading, the other with higher reinforcement content exhibited less plastic deformation.
Starting Page	1002
Ending Page	1011
Page Count	10
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	20
Issue Number	7
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2006-01-01
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Ceramic Reinforced Al Metal Aatrix Composite Hot-Pressing Method Age Hardening Flexural Strength Fracture Surface Mechanical Engineering Vibration, Dynamical Systems, Control Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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