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often sit. Since the gases have somewhat cooled by this point, the blades can be made of iron-based superalloy or even stainless steel. It is interesting to note that for strength, the metals used for turbine blades are often grown as a single crys- tal. A close look at most metals and alloys show that they are composed of crystals (also called “grains”), and the places where the crystals meet are called grain boundaries. A material is weaker at the grain boundar- ies than within the grains—especially at high tempera- tures—so turbine blades fashioned from metal formed as a single grain (no boundaries) are stronger. Metal crystals. Finally, there is a casing surrounding the engine. Although it need not withstand high temperatures like the core of the turbine, the materials here need to be strong enough that if a blade were to break off it would be contained within the casing and not enter the wing or cabin of the aircraft and cause further damage. Alu- minum or some polymer matrix materials are used as engine casings. Since the development of more powerful engines depend on the availability of ever stronger and high- er-melting materials, engineers continue to seek new alloys, ceramics, and polymers that will meet these more rigorous demands. High-Temperature Materials 42PDF Image | NASA Guide to Engines
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