ConceptCheck4

ConceptCheck4 - energy decrease. (That is, surface energy...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
96 Concept Check 4.1 Question: The surface energy of a single crystal depends on crystallographic orientation. Does this surface energy increase or decrease with an increase in planar density? Why? Answer: The surface energy of a single crystal depends on the planar density (i.e., degree of atomic packing) of the exposed surface plane because of the number of unsatisfied bonds. As the planar density increases, the number of nearest atoms in the plane increases, which results in an increase in the number of satisfied atomic bonds in the plane, and a decrease in the number of unsatisfied bonds. Since the number of unsatisfied bonds diminishes, so also does the surface
Background image of page 1

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

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: energy decrease. (That is, surface energy decreases with an increase in planar density.) 103 Concept Check 4.2 Question: Does the grain size number (n of Equation 4.16) increase or decrease with decreasing grain size? Why? Answer: Taking logarithms of Equation 4.16 and then rearranging such that the grain size number n is the dependent variable leads to the expression n = 1 + log N log 2 Thus, n increases with increasing N . But as N (the average number of grains per square inch at a magnification of 100 times) increases the grain size decreases. In other words, the value of n increases with decreasing grain size....
View Full Document

Page1 / 2

ConceptCheck4 - energy decrease. (That is, surface energy...

This preview shows document pages 1 - 2. Sign up to view the full document.

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