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Materials 2017, 10(3), 299; doi:10.3390/ma10030299

Surface Roughening Behavior of 6063 Aluminum Alloy during Bulging by Spun Tubes

1
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150090, China
2
National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China
*
Author to whom correspondence should be addressed.
Academic Editor: Sofoklis Makridis
Received: 10 December 2016 / Revised: 19 February 2017 / Accepted: 24 February 2017 / Published: 16 March 2017
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Abstract

Severe surface roughening during the hydroforming of aluminum alloy parts can produce surface defects that severely restrict their application in the automobile and aerospace industry. To understand the relation between strain, grain size and surface roughness under biaxial stress conditions, hydro-bulging tests of aluminum alloy tubes were carried out, and the tubes with different grain sizes were prepared by a spinning and annealing process. The surface roughness was measured by a laser scanning confocal microscope to evaluate the surface roughening macroscopical behavior, and the corresponding microstructures were observed using electron back-scattered diffraction (EBSD) to reveal the roughening microscopic behavior. The results obtained show that the surface roughness increased with both strain and grain size under biaxial stress. No surface defects were observed on the surface when the grain size was less than 105 μm if the strain was less than 18%, or when the grain size was between 130 and 175 μm if the strain was less than 15.88% and 7.15%, respectively. The surface roughening microscopic behavior was identified as an inhomogeneous grain size distribution, which became more pronounced with increasing grain size and resulted in greater local deformation. Concentrated grain orientation also results in severe inhomogeneous deformation during plastics deformation, and serious surface roughening. View Full-Text
Keywords: surface roughening; grain size; strain; aluminum alloy tube; bulging surface roughening; grain size; strain; aluminum alloy tube; bulging
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Cai, Y.; Wang, X.; Yuan, S. Surface Roughening Behavior of 6063 Aluminum Alloy during Bulging by Spun Tubes. Materials 2017, 10, 299.

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