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mmet 206 exam #1- Questions & Answers
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mmet 206 exam #1- Questions & Answers
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mmet 206 exam #1- Questions &Answers
what is the Brevais Lattices? Correct Ans-7 crystal system with 14 known crystal unit cell
formations
BCC Correct Ans-body-centered cubic
FCC Correct Ans-face-centered cubic
HCP Correct Ans-hexagonal close-packed
7 crystal systems Correct Ans-- cubic
- tetragonal
- orthorhombic
- monoclinic
- hexagonal
- rhombohedral
- triclinic
(a b c) is called ___ ____. Correct Ans-miller indices
,family of equivalent directions <a b c> Correct Ans-lattice directions [a b c]
what are two real world applications involving lattice planes/directions Correct Ans-- silicon
wafer production
- diamond characterization
_____ ______ are usually sliced along a {100} plane with a flat or notch to orient the wafer
during integrated circuit fabrication Correct Ans-silicon wafers
elements or materials which exist in more than one crystal structure are called _____ Correct
Ans-allotropic
over _____ of the elements in the periodic table are allotropic. Correct Ans-1/4
carbon has ____ allotropes Correct Ans-8
what are two types of crystal defects? Correct Ans-- chemical impurity
- structural defects
chemical impurities: solid solutions. Correct Ans-- substitutional
- interstitial
, structural defects: Correct Ans-- vacancies & interstitial atoms
- dislocations
edge, screw or mixed
- grain boundaries
- noncrystalline
solid solution is the principle of ______. Correct Ans-alloying
vacancies and interstitial atoms occur in _____ and _______ Correct Ans-metals and
elemental materials
imperfection pairs occurs in ________ Correct Ans-ionic materials (ceramics)
edge dislocation is also called ____ Correct Ans-slip
when a material is stressed above its _____ strength, dislocation (sip) occurs by sequential bonds
breaking and forming. Correct Ans-yield
dislocation (slip) is what happens in a material at the atomic level during its ______ deformation
Correct Ans-plastic (permanent)
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