11-9-07 - 11/9/07 Mechanical Response Si: covalent bond...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
11/9/07 Mechanical Response Si: covalent bond Metal: metallic bonds Polymer: covalent and van der Waals bonds. When you look at a product like a chip- you put together three classes of material-a ceramic like material (in terms in mechanical behavior), in the interconnects-metallic bonding, which is very different from covalent bonds— cations surrounded by a sea of electrons, polymers which is held together by covalent bonds and by van der Waal interactions. A Review on plastic deformation and elastic stretching. Different behaviors (diagram on slide) o Different materials behave differently o Materials within the same class behave differently. o Top-ceramic, middle-metal, bottom-plastic Metallic Bonds: metal ions in sea of electrons o Each metal contribute electrons-have cations that aren’t fixed, but they are relatively fluid in a glue of electrons that keeps them in electrostatically. It allows these atoms to be fluid (atoms that aren’t quite fixed in position) o The picture is quite compactable—metals have electrons that can move when you apply a voltage. Elastic Deformation o Diagram on slide o Atomic scale: bonds act like elastic springs o You see that at atomic scale-have metallic atoms in domains. When you apply a deformation, when relatively small in elastic regime, the bonds
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
start stretching like an elastic spring. When you release the stress, as an elastic spring, the bonds will snap back to the original position. o You are in a position, where the stress is small enough, the atomic bonds are like a spring—the stress upon release, atoms will return to their original position. o
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 5

11-9-07 - 11/9/07 Mechanical Response Si: covalent bond...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online