Journal
JOURNAL OF MANUFACTURING PROCESSES
Volume 22, Issue -, Pages 90-98Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jmapro.2016.01.003
Keywords
Friction stir welding; Post weld heat treatment; Mechanical properties; Wear; AA6061-T6; Nano-sized Al2O3
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In the present study, 6 mm thick AA6061-T6 alloy was friction stir welded (FSWed) at different traveling speeds while Al2O3 nano-particles were incorporated between adjoining plates. To investigate the influence of post weld heat treatment (PWHT) on microstructure and wear properties, solution treatment cycle was applied to FSWed specimens for 1 hat 540 degrees C then aged for 18 hat 180 degrees C. Distribution of Al2O3 nano-particles in the stir zone (SZ) was observed via scanning electron microscopes (SEM). After heat treatment, grain size changed imperceptibly. Surprisingly, all specimens exhibited inferior hardness to the as-received AA6061-T6 alloy which was attributed to precipitates solution during FSW. After heat treatment, hardness value of the specimen FSWed at 40 mm/min improved. In the meantime, the uniform dispersion of Al2O3 particles in this specimen resulted in refinement and homogenous distribution of strengthening precipitates. Thanks to Al2O3 nano-particles, wear loss reduced remarkably (62%). Additionally, after heat treatment, the specimen FSWed at 40 min/min showed improved wear behavior. (C) 2016 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.
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