Aluminium. Only the Avid "Mag" was different with a magnesium lever, the body being the same cast aluminium. The "Ti" were just SD7 with Ti bolts/finishing kit with aluminium lever and body.
You might be able to bend it back slightly, but it will be weakened and may well not survive another prang. Having said my SD1.9s seem to keep going on after afar bit of bashing.