Iranian Journal of Manufacturing Engineering

Iranian Journal of Manufacturing Engineering

Design and manufacture of Cyclic Expansion Extrusion (CEE) die and investigation of microstructure and strength of aluminum 1050 under the process

Document Type : Original Article

Authors
Farshid Ahmadi 1
Alireza Foroughi 2
1 Assistant Professor, Faculty Member, Department of Mechanical Engineering, University of Kashan, Kashan, Iran
2 MSc Graduate, Department of Mechanical Engineering, University of Isfahan, Isfahan, Iran
10.22034/ijme.2024.466177.1982
Abstract
One of the processes of severe plastic deformation that has recently received attention is the cyclic extrusion expansion process (CEE). Investigating the effect of CEE process in different passes on the mechanical properties and microstructure of aluminum alloy 1050 was the aim of this paper. After designing and building the CEE die, aluminum samples were processed with the number of 1, 2, 4, 6 and 8 passes. The tensile strength graphs showed that by increasing the number of passes, the tensile strength of the samples gradually increased from 72 MPa for the annealed sample to 99.4 MPa in the 4-pass sample, and a 38% increase in strength was achieved. In the following, with the increase of the number of passes, the trend of strength variations exhibited a slight decline. Furthermore, the microstructural analysis of the specimens indicated that the grain size has decreased from 260 μm in the annealed sample to 150 μm in the 4-pass sample according to the strength variation trend. However, this trend was relatively reversed in the 6th and 8th passes. The underlying rationale for this observed trend can be attributed to the phenomenon of dynamic recovery of the microstructure commencing from the 6th pass onward. Owing to the high stacking fault energy of this alloy, coupled with higher mobility of dislocations, the likelihood of dislocations rearrangement and annihilation is significantly heightened. Besides, along with the relative increase in temperature resulting from the deformation process, it facilitates both dynamic recovery and grain growth.
Keywords
Severe Plastic Deformation
CEE Process
Microstructure
Grain Size
Tensile Strength
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