Particle strengthening by precipitation

Jacob
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The strength and hardness of some metal and alloys may be enhanced by the formation of extremely small uniformly dispersed particles of a second phase within the original phase matrix; this  must  be  accomplished  by  phase  transformations  that  are  induced  by  appropriate  heat treatments. The process is called precipitation hardening because the small particles of the new phase  are  termed  “precipitates”.  Precipitation  hardening  and  the  treating  of  steel  to  form tempered matrensite are totally different phenomena, even though the heat treatment procedures are similar.

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