Experimental investigation and modelling of hot forming B4C/AA6061 low volume fraction reinforcement composites
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Imperial College London, Department of Mechanical Engineering
Harbin Institute of Technology, School of Material Science and Engineering
Marbeau Design Consultancy, Paris
University of Birmingham, Department of Mechanical Engineering, Birmingham
Submission date: 2018-01-05
Acceptance date: 2018-02-07
Online publication date: 2018-04-15
Publication date: 2018-04-15
Journal of Theoretical and Applied Mechanics 2018;56(2):457–469
This paper presents an experimental investigation of the hot deformation behaviour of 15% B4C particle reinforced AA6061 matrix composites and the establishment of a novel corresponding unified and physically-based visco-plastic material model. The feasibility of hot forming of a metal matrix composite (MMC) with a low volume fraction reinforcement has been assessed by performing hot compression tests at different temperatures and strain rates. Examination of the obtained stress-strain relationships revealed the correlation between temperature and strain hardening extent. Forming at elevated temperatures enables obvious strain rate hardening and reasonably high ductility of the MMC. The developed unified material model includes evolution of dislocations resulting from plastic deformation, recovery and punching effect due to differential thermal expansion between matrix and reinforcement particles during non-steady state heating and plastic straining. Good agreement has been obtained between experimental and computed results. The proposed material model contributes greatly to a more thorough understanding of flow stress behaviour and microstructural evolution during the hot forming of MMCs.