Eplanar and linear densities

Eplanar and linear densities - continuous contact Direction...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
BCC – (100) Planar Densities = Effective # of atoms whose center lies in the plane Area of the plane Simple Cubic – (100) a a =(4*1/4)/a 2
Background image of page 1

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

View Full DocumentRight Arrow Icon
Planar Density BCC – (110) a 2 a = Effective # of atoms whose center lies in the plane Area of the plane =(4*1/4+1)/(a.a√2)
Background image of page 2
Planar Density a a FCC – (100) FCC – (111) 2 a 2 a 2 a = Effective # of atoms whose center lies in the plane Area of the plane =(4*1/4+1)/(a.a) # of atoms on the plane = 3*1/6+3*1/2=2 Area=1/2(a√2/2)(a√3/ √2)
Background image of page 3

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

View Full DocumentRight Arrow Icon
Linear Density y x z [110] [100] y x z [110] [111] [100] FCC BCC 2 a a a a a 3 a 2 a 3 a [111]
Background image of page 4
y x z Most efficiently packed planes: (110) family Most efficiently packed directions: [111] family All Body diagonals BCC
Background image of page 5

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

View Full DocumentRight Arrow Icon
y x z Most efficiently packed planes: (111) family Most efficiently packed directions: [110] family (All Face diagonals) FCC
Background image of page 6
Close packed Planes and Directions Planes and directions where atoms are in
Background image of page 7

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

View Full DocumentRight Arrow Icon
Background image of page 8
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: continuous contact Direction Plane SC [100] none BCC [111] none FCC [110] family (111) family HCP-Basal plane Packing of atoms not the same along different planes and directions in a crystal. Grain structure A grain is a crystal with a certain orientation in 3-d space. Since real materials are usually made of billions of crystals each with a different orientation as shown above, we create grain boundaries which are boundaries between crystals of different orientation. The average grain size is an important microstructural characterics that affects all properties. So we measure grain size, n , by using the ASTM standard: N = 2 n-1 where is the average # of grains/sq. inch at a magnification of 100X....
View Full Document

Page1 / 8

Eplanar and linear densities - continuous contact Direction...

This preview shows document pages 1 - 8. Sign up to view the full document.

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