Effect of Low Temperatures Aging on Mechanical Properties and Microstructure of Solutionized Aluminium 6061 Alloy after Processed by ARB
Ali Alhamidi (a*), Agus Pramono (b), Hadi Ariefiyanto (c) and Reza Komarulloh (d)
a, b) Department of Metallurgy, Faculty of Engineering, Universitas Sultan Ageng Tirtayasa, Cilegon, Banten
Jalan Jend. Sudirman Km.03, Banten 42435, Indonesia
*alhamidi[at]untirta.ac.id
c) Fluid Power Division, PT. Yerry Primatama Hosindo, Tangerang, Indonesia
d) PT. Wanatiara Persada, Halmahera, Maluku, Indonesia
Abstract
An Alumunium alloy (AA) 6061 was solution treated at 520 0C for 1.5 h and quenched in iced-water. The sample subsequently processed by accumulative roll bonding (ARB) at 50% reduction in one cycle and aged at temperatures of 100, 150, 200 0C for 60, 300, 6000, 9000, 12000, 30000 and 60000 s. The hardness measurement was found that high hardness attained of ~54 HV for sample after cold rolled and subsequently aged up to 60000 s at 100 0C after ARB process. The SEM observation was also showed that the grain sizes were reduced to ~2 mm and the distribution of second-phase Mg2Si particles had become homogeneous. X-ray diffraction analysis by using high score plus software reveal that the significant increase in hardness and strength is due to the formation of second-phase and high micro-strain to 12.54 x 10-4 for sample after processed ARB and aged at low temperature.
Keywords: Alumunium Alloy 6061, Accumulative roll bonding (ARB), SEM, XRD
Topic: Metallurgy Engineering