Study on hot deformation behavior and workability of stir-cast Al6063-6wt.% steelp based composites

Journal of the Mechanical Behavior of Materials

Babalola Saheed Adeoye¹  Bodunrin Michael Oluwatosin²  Alaneme Kenneth Kanayo³  Chown Lesley Heath³  Maledi Nthabiseng Beauty⁴ 

[1] Centre for Nanoengineering and Tribocorrosion, School of Mining, Metallurgy and Chemical Engineering, Faculty of Engineering & the Built Environment, University of Johannesburg, South Africa;DST-NRF Centre of Excellence in Strong Materials, University of the Witwatersrand, Private Bag 3, WITS, 2050, Johannesburg, South Africa;Materials Design and Structural Integrity Research Group, Department of Metallurgical and Materials Engineering, Federal University of Technology Akure, P.M.B. 704, Ondo State, Nigeria;School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Private Bag 3, WITS, 2050, Johannesburg, South Africa;

关键词: al 6063/steelp composite;    hot deformation;    dynamic strain ageing;    processing map;    deformation mechanism;    workability;   

DOI  :  10.1515/jmbm-2021-0012

来源: DOAJ

【 摘 要 】

Investigation on the hot deformability and workability of stir cast 6 wt.% steel particles reinforced aluminium 6063 matrix composites was undertaken in this study. Flow stress – strain curves generated from hot compression tests performed at strain rates of 0.01, 0.1, 1, and 10 s−1, and temperatures between 200–400°C, were used to study the flow behavior of the composite, while processing map developed from analyses of the deformation data, was used to establish the deformation mechanisms and processing safe zones for effective workability. Flow stress oscillations were observed to be prevalent at lower deformation temperatures and strain rates; largely due to the settling of reinforcement particles at grain boundary vicinities, rather than a homogeneous distribution. Also, the flow behaviour was largely strain rate insensitive. The dominant flow mechanism based on the flow stress patterns, processing map and microstructural validation was established to be dynamic recovery. Safe regions for processing based on Murty's and Gegel's criteria established the safe processing zones to be ~270–400°C at 0.01–1.0 s−1 and 380–400°C at 10 s−1. Deformation processing was unsafe at 200–260°C at 0.01–1.0 s−1 and between 200–380°C at 1.0–10 s−1.

【 授权许可】

Unknown