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2691924 
Journal Article 
Characterization of ultrafine-grained aluminum tubes processed by Tube Cyclic Extrusion-Compression (TCEC) 
Babaei, A; Mashhadi, MM 
2014 
1 
Materials Characterization
ISSN: 1044-5803
EISSN: 1873-4189 
95 
118-128 
WOS:000340989900013 
has retraction 4178717 Characterization of ultrafine-grained aluminum tubes processed by Tube Cyclic Extrusion Compression (TCEC) (Retraction of Vol 95, Pg 118, 2014)
Tube Cyclic Extrusion-Compression as a novel severe plastic deformation technique for tubes was utilized for processing ultrafine grained 1050 aluminum alloy for the first time. In this method, aluminum tube is fully constrained and deformed between mandrel and chamber with a small neck zone. The material deformation during Tube Cyclic Extrusion-Compression processing analyzed and the grain refinement mechanism were described. The capability of Tube Cyclic Extrusion-Compression in grain refinement of the aluminum alloy was demonstrated by transmission electron microscopy observations and X-ray diffraction line profile analysis. The micrographs of the evolved microstructure show grain size of 850 nm and 550 nm after the first and second processing cycles of Tube Cyclic Extrusion-Compression, respectively. Mechanical properties of the initial and processed specimens were extracted from ring-hoop tensile tests. The documented results confirm grain refinement by showing remarkable increase in the yield and ultimate strengths. The main increase in strength and decrease in elongation take place after the first cycle. The microhardness assessments illustrate increase from the initial value of 29 Hv to 44 and 49 Hv respectively after the first and second cycles of Tube Cyclic Extrusion-Compression. There is a good homogeneity in peripheral microhardness and microhardness across the tube thickness. (C) 2014 Elsevier Inc. All rights reserved. 
Tube Cyclic Extrusion-Compression; Severe plastic deformation; Ultrafine grained; Microhardness; Mechanical properties