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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/28370

Title: Hydrostatic cyclic expansion extrusion (HCEE) as a novel severe plastic deformation process for producing long nanostructured metals
Authors: Samadpour, F.
Faraji, Ghader
Babaie, P.
Bewsher, Stephen R. (Rickie)
Mohammadpour, Mahdi
Keywords: Severe plastic deformation
Hydrostatic Cyclic Expansion-Extrusion
Scale-up
Electron backscatter diffraction (EBSD)
Grain refinement
Issue Date: 2018
Publisher: © Elsevier
Citation: SAMADPOUR, F. ... et al, 2018. Hydrostatic cyclic expansion extrusion (HCEE) as a novel severe plastic deformation process for producing long nanostructured metals. Materials Science and Engineering: A, 718, pp.412-417.
Abstract: In this paper, hydrostatic cyclic expansion extrusion (HCEE) is developed as a new severe plastic deformation technique for processing of the relatively longer ultrafine grained samples. Increasing the length of the processed sample, decreasing the processing load astonishingly, and increasing the hydrostatic stresses are the main advantages of HCEE. In this process, pressurized hydraulic fluid surrounded workplace played the primary role in reducing the friction load and in reducing consequently total load. The HCEE process was applied to commercial pure aluminum 1050 samples at room temperature, and then microstructural evolution and mechanical properties were examined. Microstructure analysis using back-scatter diffraction (EBSD) revealed that a significant grain refinement is achieved after the HCEE process. The average size of grains and subgrains decreased to ~700 nm after two passes of the HCEE process from the initial value of 50 µm in the unprocessed sample. Yield and ultimate strength were increased from 40 MPa and 52 MPa to 125 MPa and 137 MPa after two passes of HCEE process. Also, microhardness was increased from 36 HV to 45 HV after the first pass. The process seems to be very promising for industrial application of SPD processing which suffer from the main challenge of limited sample size.
Description: This paper was published in the journal Materials Science and Engineering: A and the definitive published version is available at https://doi.org/10.1016/j.msea.2018.01.116.
Sponsor: This work was supported by Iran National Science Foundation (INSF).
Version: Accepted for publication
DOI: 10.1016/j.msea.2018.01.116
URI: https://dspace.lboro.ac.uk/2134/28370
Publisher Link: https://doi.org/10.1016/j.msea.2018.01.116
ISSN: 0921-5093
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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