Technology
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I doubt that it's ever going to be super affordable, or be used in something as common as a phone. The price constraints on aluminum were due to the amount of energy it takes to produce. The transparent aluminum is a bit more complicated.
From the article it appears the fabrication is mold dependent, which always increases production cost. So you have to fabricate a mold for any new component. You then have to then pressurize the powder at 15k pounds per square inch, and then heat aluminum powders at 2000 degrees Celsius for 2 days.