Eng 45 - Chapter 1 - Structure(33)

Eng 45 - Chapter 1 - Structure(33) - Materials Scien ce...

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Materials Science Fall, 2007 Page 32 Chapter 3: Crystal Structure Chapter 3: Crystal Structure Without stirring abroad One can know the whole world Without looking out of the window One can see the way of heaven ...The sage knows without having to stir Identifies without having to see - Lao Tzu, "Tao Te Ching" 3.1 THE CONCEPT OF MICROSTRUCTURE The properties of a material are determined by the atoms or molecules it contains (composition) and by their arrangement (microstructure). The microstructure is the difficult part of this verbal equation. Given the available materials characterization tech- niques and all plausible extensions of them, there is no hope of specifying where the atoms are located in a solid and there is no practical way of storing that vast amount of information in retrievable form. A practical description of the microstructure of any real material must, therefore, be based on strong simplifying approximations. The practical description of microstructure begins from the observation that one
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Eng 45 - Chapter 1 - Structure(33) - Materials Scien ce...

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