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GM may be using other material to save weight in future vehicles, including EVs and hybrids. The use of carbon fiber is known, but now GM may also use magnesium as inner door panels and more:
http://gmauthority.com/blog/2016/05/magnesium-door-panels-coming-to-general-motors-vehicles-in-the-future/

"Magnesium could become the next big thing in weight savings regarding inner door panel construction, with incredible benefits over current inner door panel construction. GM stated just over 10-pounds per inner door panel can be shaved off by incorporating magnesium construction. In other words, magnesium inner door panels are 30-percent lighter than aluminum and 50-percent lighter than traditional steel.":)

Magnesium has been used in racing cars to reduce wheel weight, but this is the first news from any manufacturer about using it in a different body part. We may see this new use soon.:cool:
 

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Its good to hear they are finally focusing on weight.

Carbon fiber can be cheaper than steel, but to use it cheaply every single car GM sells would need to use the exact same carbon fiber component (obviously finishing and trimming can be different)

This goes contrary to the trend of the last 15 years and would require design forsight that no American company at this time possesses.
 

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"The ensuing fuel fire raised the temperature of the remaining Elektron bodywork past its ignition temperature, which was lower than other metal alloys due to its high magnesium content. The alloy burst into white-hot flames, sending searing embers onto the track and into the crowd. Rescue workers, totally unfamiliar with magnesium fires, poured water on the inferno, greatly intensifying the fire. As a result, the car burned for several hours."

https://en.wikipedia.org/wiki/1955_Le_Mans_disaster
 

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Formula 1 banned the use of magnesium sheet metal of less than 3 mm thick in 1972. Other racing organizations have similar bans. Larger magnesium parts are less likely to catch fire, but when they do, it's a real problem for firefighters. Airplane wheels are magnesium and are known risks which is why airport crews receive special training. Smaller parts in cars are increasingly common and hence cause increasing problems. Some of them are described here:

http://www.midsouthrescue.org/id21.html

 

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Our 2010 vette is magnesium roof frame, magnesium or aluminum castings, balsa wood flooring, carbon fiber + glass-filled polymer body parts, fiberglass suspension springs, titanium rods and some other driveline parts, aluminum chassis and suspension arms, carbon ceramic brakes.

There isn't much steel left but the crankshaft. :D

People still have the crazy idea that Chevy is primitive. Then they get confused when a Chevy or Cadillac prison-rapes German six-digit cars.

There is something the non-gearheads have no clue about. That the best engineers are still in the US.
 

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Ah, Dowmetal. The reason TIG welding was invented. Great stuff for the engineers but corrosion control is a YUGE issue.
 
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