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precipitation hardening

noun
  1. metallurgy a process in which alloys are strengthened by the formation, in their lattice, of a fine dispersion of one component when the metal is quenched from a high temperature and aged at an intermediate temperature
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012