An Aluminum alloy 6061was produced by cold rolling and subsequently aging. Cold rolling is used for reducing grain size and aging is used for producing second-phase, thus improving hardness, strength and wear resistance. In the present paper, a process through cold rolling with reduction of 50%, 60% and 70% in thickness then aged at 2000C for 1.800, 3.600, 5.400, 7.200 and 10.800 sec. Microstructural analysis shows that the grain morphology consists of equalized grain for as-received samples and elongated grain for sample after cold roll and aging. X-Ray Diffraction (XRD) analysis showed peaks phases in Al 6061 after cold rolled and aging. Hardness measurements showed that combination between small grain size and presence of second-phase led to a significant increase in the hardness. Maximum hardness of 121 HBN is achieve for sample after cold roll 70% and aged for 5400 second. The wear resistance testing showed that lost particles of 6,209951 x 10-6 mm3/mm for received sample and 4,775436 x 10-6 mm3/mm for sample after aging process. It is showed that high hardness related to increase the wear resistance. It is reasonable that the presence of second phases are function as obstacle for dislocation movement.
There have been many experiments regarding reusing plastic bottles, especially polyethylene (PET) as building materials. Some of them are experimenting with their compressive strength as exterior wall bricks (Mansour, et al., 2015); their energy consumption as roof insulations (Racolta, et al., 2016); their compressive and flexural strength as interior walls (Santana, 2016); and their compressive strength as walls and slabs (Oyinlola, et al., 2018). This paper discusses the compressive strength and the flexural strength of PET bottles as structural floor panels. This study explored the positions, binders, patterns, fillers, sizes, and supports of the PET bottles panel to reach the optimum combination of compressive and flexural strength. The experimental result shows that PET bottles panel with an upright position, sealant binder, and sand filler has better compressive strength and flexural strength. It also shows that the panels with more bottles face downwards have better compressive strength, while the ones with more bottles face upwards have better flexural strength. On the other hand, panel with smaller size and higher amount of support shows better flexural strength.
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