Fisker Automotive has finally taken the digital wraps off of the advanced aluminum space frame that the Karma plug-in hybrid (PHEV) will be built around. In lieu of enjoying a new concept vehicle at the Geneva Motor Show this week, Fisker fans will have to make due with this peek at the bones of the Karma, the part that gives the luxury car its "new levels of rigidity and strength that will give the world's first premium plug-in hybrid electric vehicle world-class ride and handling characteristics." The frame is made with 5,000- and 6,000-series aluminum alloys, which the all-knowing Wiki says are "suitable for cryogenic applications and low temperature work. However is susceptible to corrosion above 60°C" (the 5,000-series) and are made with magnesium and silicon alloys, "are easy to machine, and can be precipitation hardened, but not to the high strengths that 2000, and 7000 can reach" (the 6,000-series). Now you know.
You can read the original press release announcing the aluminum space frame here.