lect5-processingproperties - Lecture 5 Biomaterials...

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Lecture 5: Biomaterials Processing and Properties Last time, we learned about nucleation and growth.  This time, we will focus on controlling nucleation  and growth via processing to impact the properties  of materials. Properties of common materials Material Tm (˚C) Modulus (E) Yield  Strengt h Conductivit y (1/ Ω•m) Steel (Fe-C,  C<1.2 wt%) ~1370 200 GPa 2.1 GPa 0.14x10 7 Alumina (Al 2 O 3 also sapphire ~2100 400 GPa 0.25 GPa 2x10 -14 Silicon ~1410 180 GPa 4x10 -4 Copper ~1080 Single xtal 192  GPa Polyxtal 110 GPa 6x10 7 Polyethylene  (HDPE) 100-150 0.2-0.7 GPa <10 -14 Natural rubber No Tm (it’s  amorphous) 10 -2 -10 -3  Pa Poly(lactic acid)  (PLA) 173-178 3.2 GPa 1
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Silica (quartz) ~1000 ~75 GPa Silica (glass) ~1000, ~600  with dopants ~70 GPa Compiled from Ralls, Courtney, Wulff Introduction to Materials Science and   Engineering This is caused by: atoms Bonding Defects—imperfections in crystals Defects are directly impacted by PROCESSING So, how do we control these defects via processing? Last time, we looked at nucleation and growth….
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lect5-processingproperties - Lecture 5 Biomaterials...

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