Издательство: | Книга по требованию |
Дата выхода: | июль 2011 |
ISBN: | 978-3-8364-8431-2 |
Объём: | 108 страниц |
Масса: | 184 г |
Размеры(В x Ш x Т), см: | 23 x 16 x 1 |
In this research AA6060 alloy was used and was extruded at 25m/min, 30m/min, 35m/min, 40m/min and 45m/min for a particular profile. The highest exit temperature increased from 542°C to 567°C when the extrusion speed was increased from 25m/min to 45m/min. Three types of die pick-up were identified. They were named as normal pick-up, die line pick-up and lump pick-up. Normal pick-up occurred regardless of the extrusion speed and exit temperature; however the amount of normal pick-up did not increase when the extrusion speed was increased. Die line pick-up occurred when the extrusion speed was 45m/min and appeared only on the die lines. Lump pick-up is not significant since it was very rare. AA6060 (0.4%Mg and 0.5%Si) alloy has about 0.27% excess silicon and therefore at 555°C, Mg2Si particles react with aluminium and excess silicon to form liquid. However normal pick-up and die line pick-up still occurred at temperatures lower and higher than 555°C and therefore it confirms that eutectic reactions do not influence formation of pickup. Therefore die pick-up is most likely to be caused due to a mechanical process rather than a metallurgical process.
Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.