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Chapter 24

Chapter 24. Precious, Refractory, and Specialty Metals. Precious Metals • Refractory Metals • Specialty Metals. Industrial applications of the precious metals utilize the unique properties they exhibit.

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Chapter 24

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  1. Chapter 24 Precious, Refractory, and Specialty Metals Precious Metals • Refractory Metals • Specialty Metals

  2. Industrial applications of the precious metals utilize the unique properties they exhibit.

  3. Pure silver has the lowest electrical resistivity of any metal and is an excellent conductor of heat.

  4. Gold is commonly alloyed with copper and silver to increase hardness, increase strength, and minimize cost.

  5. The platinum group can be divided into three sets of twins by the crystal structures and properties they exhibit.

  6. The recrystallization temperatures of pure metals is approximately 40% of their melting temperatures.

  7. Wrought tantalum alloys have good ductility at cryogenic temperatures.

  8. Niobium is solid solution hardened by tantalum, tungsten, molybdenum, titanium, and zirconium.

  9. The major use of molybdenum is as an alloying element in steels, cast irons, heat-resistant alloys, and corrosion-resistant alloys.

  10. An important use of tungsten is as an alloying element in steels, high-speed tool steels, and nickel-cobalt alloys.

  11. The major use of beryllium is as an alloying element in copper and nickel to produce age-hardening alloys for springs, electrical contacts, spot welding electrodes, and nonsparking tools.

  12. The major use of zirconium is as zircon sand in foundries.

  13. Most zirconium alloys are dilute alpha alloys and consist of alpha phase at room temperature.

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