ch11.3-S06 - Precipitation Hardening We know from chapter 8...

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MY2100 – Ch 11, Part 3, Slide 1 Precipitation Hardening We know from chapter 8 that we can strengthen crystalline materials by making it harder for dislocations to move. We can do this by: Refining grain size (small effect) Adding solid solution elements Cold working Adding second phase precipitates
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MY2100 – Ch 11, Part 3, Slide 2 Second Phase Precipitates The size, shape , and amount of second phase particles controls mechanical properties. We learned about the following methods: Eutectic systems (solidification) Steels (controlling the eutectoid, or utilizing martensite as an intermediate phase in processing) Another very common, important mechanism for strengthening crystalline materials (metals and ceramics) is precipitation hardening , sometimes called age hardening . Used in structural aluminum alloys, nickel alloys for high temperature use, some high-strength steels, etc.
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MY2100 – Ch 11, Part 3, Slide 3 Precipitation hardening - what is necessary Need a phase diagram that looks like this: two phases at low temperature can heat it up, without melting, to one phase at high temperature
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ch11.3-S06 - Precipitation Hardening We know from chapter 8...

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