Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 590, Issue -, Pages 289-294Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.10.036
Keywords
Severe plastic deformation; Tubular channel angular pressing; TEM analysis; Mechanical behavior
Categories
Funding
- Ministry of Higher Education, Malaysia [UM.C/625/1/HIR/MOHE/ENG/27]
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Ultrafine grained (UFG) aluminum tubes were fabricated by the tubular channel angular pressing (TCAP) process. The microstructural evolution was characterized by transmission electron microscopy (TEM) and mechanical properties were evaluated by compression test and hardness measurements. TEM analysis of specimen subjected to one TCAP pass showed the formation of an array of elongated subgrains with high angle grain boundaries. Increase in the number of passes changes the elongated grains to equiaxed grains with similar to 310 nm sizes. Microhardness value of the processed tubes was enhanced to 49.4 Hv after one pass from an initial value of 32.9 Hv. Yield and ultimate strengths were increased 2.5 and 2.28 times as compared to annealed specimen. Compression tests also showed that UFG aluminum tubes exhibit lower work hardening and almost perfect plastic behavior without any failure. (C) 2013 Elsevier B.V. All rights reserved.
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