- Carborundum (Silicon carbide) is extremely hard but very brittle. - Tungsten is very hard and has a high melting point, but it is also brittle at room temperature, although it can be made ductile at high temperatures. - Cast iron is relatively hard but is known for being brittle due to its high carbon content. - Nichrome is an alloy of nickel and chromium, often with iron. It is known for its high electrical resistance, resistance to oxidation at high temperatures, high melting point, and good mechanical properties. It is both hard and ductile, particularly useful for drawing into thin wires (ductility) that can withstand high temperatures (hardness/ strength).
Which one of the following materials is very hard and very ductile?
Asked in UPPCS Prelims 2000 · Topic: Physical Properties of Materials (Hardness, Toughness, and Brittleness)
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