Mallory and Hevimet are two tungsten alloys often misconstrued as being WC, but they are not carbon-bonded; rather, they are alloyed with Ni or Ni and Copper (Cu). The inclusion of tungsten in alloys such as Ni Alloys, Ni-Co Alloys, and Co Alloys enhances their structural integrity. Tungsten's exceptionally high melting temperature (3400°C) and density (atomic number 74) contribute to their resistance to thermal expansion. This property is crucial in aerospace alloys, where the ability to maintain shape under extreme temperature and stress conditions is essential for optimal performance.

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