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lect4-solidificationandprocessing - Lecture 4 Biomaterials...

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Lecture 4: Biomaterials Solidification and processing Last time, we looked at how atoms pack in metals  and ceramics. We also began to understand  polycrystalline materials and grain boundaries. We  noted that processing controls the density of grain  boundaries, and we began to talk about metal  processing, namely solidification which is a PHASE  TRANSITION. We ended by looking at MARTENSITIC PHASE  TRANSFORMATIONS. ABA ABC For phase transitions, like solidification, that aren’t spontaneous, one  has nucleation and growth. Solidification: Nucleation and Growth Nucleation.       How solidification starts. Gibb’s Free Energy 1 H L
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G = D H - T D S For solidification, ∆H=-L The latent heat of fusion (liq solid) At T m , ∆G=0 ∆H-T∆S=0=-L-T∆S so that  S = - L T m For simplicity, ∆c p =0 (the heat capacity at constant pressure is  zero) G = - L + T L T m We apply a simple rearrangement and find that G = L T m T - T m [ ]
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lect4-solidificationandprocessing - Lecture 4 Biomaterials...

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