Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7973283 | Materials Science and Engineering: A | 2018 | 13 Pages |
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 ~700â¯nm after two passes of the HCEE process from the initial value of 50â¯Âµm in the unprocessed sample. Yield and ultimate strength were increased from 40â¯MPa and 52MPa to 125 and 137â¯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.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
F. Samadpour, G. Faraji, P. Babaie, S.R. Bewsher, M. Mohammadpour,