Dispersion Strengthening

Dispersion Strengthening - Dispersion Strengthening Chapter...

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Unformatted text preview: Dispersion Strengthening Chapter 10 In the last chapter… We talked about alloys that form from materials that are completely soluble in each other We also learned not all materials are completely soluble In this chapter we’ll talk about what happens when there are multiple solid phases Dispersion Strengthening The existence of two or more phases can strengthen a material Matrix – present in large amounts Precipitate – present in smaller amounts Guidelines Matrix should be soft to provide ductility Precipitate should be hard to provide strength – more precipitate results in higher strength Precipitate should be discontinuous Guidelines Smaller, more numerous precipitate particles give higher strength because they interfere with slip Round particles are better than sharp particles – Sharp particles can initiate a crack Intermetallic Compounds Often precipitates are intermetallic compounds – metals that are bonded to each other Stoichiometric Compounds Non-stoichiometric Compounds have a range of compositions (often a blend of two or more stoichiometric compounds) T e m p e r a t u r e Wt% Y X Y Liquid α β Liquidus Solidus Solvus Solvus Solidus α + L β + L α + β Three Phase Reaction T...
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This note was uploaded on 01/22/2012 for the course ME 2733 taught by Professor Meng during the Fall '10 term at LSU.

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Dispersion Strengthening - Dispersion Strengthening Chapter...

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