Commercial 7075-T6 aluminum alloy was subjected to friction stir welding (FSW), resulting in development of a fine-grained structure with average size of about 3 mm in the nugget zone. Static annealing at temperatures ranging from 623 to 773 K for 30 min showed that the fine grain microstructure was stable at temperatures not higher than 723 K. Increase in annealing temperature up to 773 K led to an abnormal grains growth, followed by the development of mm-scale grains. The specimens obtained from the nugget zone demonstrated a superplastic behavior at temperatures ranging from 623 to 723 K and at strain rates ranging from 1 Â 10 À4 to 1 Â 10 À2 s À1 . Large elongation of about 440% was observed at a temperature of 673 K and at a strain rate of 1 Â 10 À3 s À1 .
It is well known that backlights for Liquid Crystal Displays (LCDs) based on Red, Green and Blue Light Emitting Diodes (RGB LEDs) render superior color quality but do require control of white point over temperature and lifetime [3], [4], [5]. We have developed a novel backlighting system utilizing RGB LED lightsources, a color sensor and a feedback controller. The main result of using optical feedback is a color stability Δ u'v' < 0.002 (CIE1976) over temperature. Optionally, brightness can be maintained constant. The system can control any color point or brightness required.
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