By actuator do you mean the waste-gate actuator? If so then what was the mode of failure (belows rupture, linkage failure)....... I promise you that someone has already solved this problem with a cheap part that you can buy instead of trying to determine what material would be best to fabricate a new part out of.
Regardless if you want to go that material route I would look at Inconel then Tungsten and finally ceramics. This is the dreamland option.
The real answer is to get an external waste-gate that is either electrically controlled or has a metal bellows.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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