Eng 45 - Chapter 1 - Structure(12)

Eng 45 - Chapter 1 - Structure(12) - Materials Scien ce...

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Materials Science Fall, 2007 Page 11 mechanical fatigue, a process in which internal cracks form and grow monotonically until the material finally breaks in two. When dissimilar metals are in contact in the presence of water one of them is likely to corrode at a very rapid rate. When metals slide in direct contact with one another, as in an unlubricated bearing or gear, they rapidly heat, soften and wear to failure. Exposure to high temperature accelerates microstructural evolution, and may cause a rapid and permanent deterioration in material properties. At low temperatures materials become strong, but may also become very brittle. This is a partial list of the classic material failure modes a cautious engineer ought to know about, and will know about if he has an elementary knowledge of Materials Science. We shall cover all of them and others in this course. At the end of it you will hopefully have learned to treat engineering materials with a healthy mixture of confidence and trepidation. 1.4 WHY CHANGE FROM GOOD BRONZE TO BAD IRON?
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Eng 45 - Chapter 1 - Structure(12) - Materials Scien ce...

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