I believe it is Carbon Fiber.
Airplanes are made out of aluminum alloys because weight is such an important factor in aircraft design. Aluminum and aluminum alloys are much lighter than other metals.
Primarily aluminum and aluminum alloys.
aluminum
Aluminum
the engine
Aluminum
Aluminum
Yes. Several aluminum alloy's particularly 7075 series
Many things are made from aluminum. A few of these are; kitchen utensils, airplanes, foil.
A stronger type of aluminum is used because it is light enough for the airplane to fly and it's very durable
Pure aluminum is not strong enough as building material for airplanes. Alloy with Al are stronger.
Aluminum is easier and cheaper to mass produce than is steel. If you recycle aluminum, you get more money for aluminum than for steel only because manufacturers have for decades focused on aluminum as the cheaper way to manufacture so many things. Aluminum is lighter in weight; is more easily bent into desired shapes; can be easily separated from other metals (chemical process); and is easily shipped to manufacturing plants. As one example, in the earlier days, airplanes contained steel and were heavier, cost more in fuel, etc. Now, all airplanes are made of aluminum shells, are lighter in weight, use less fuel because it is lighter in weight, and all of the aluminum can be recycled. Same with automobiles.