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2 Crystal Structure @ Www 07 Met Tk

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  • 1. Crystalline Materials All About Metallurgical & Materials Engineering Download This & More Stuff @ WWW.07MET.TK
  • 2. Crystalline Material
    • Metals and many non-metallic solids are crystalline i.e
    • The constituent atoms are arranged in a pattern that repeat itself periodically in three dimensions.
    • The actual arrangement of the atoms is described by the crystal structure.
  • 3.
    • The crystal structures of most pure metals are simple.
    • Three most common structures are:
    • body-centered cubic,
    • Face-centered cubic,
    • Closed-packed hexagonal structures
    • In contrast, the structures of alloys and non-metallic compounds are often complex.
  • 4.
    • The positions of the planes, directions and point sites in a lattice are described by reference to the unit cell and the three principal axes, x, y, and z.
    • Miller indices of the specific plane (hkl).
    • Crystallographic direction are indicated by [uvw]
    • Family of planes {hkl}
    • Family of Crystallographic directions are indicated by <uvw>
  • 5. Relationships between a direction and a plane for cubic system
    • 1) [uvw] is normal to (hkl) when u = h; v = k; w = l. [111] is normal to (111).
    • 2) [uvw] is parallel to (hkl), i.e; [uvw] lies in (hkl), when hu + kv + lw =0 e.g [112 - ] is a direction in (111) .
  • 6.
    • 3) Two planes (h1k1l1) and (h2 k2 l2) are normal if h1 h2 + k1 k2 +l1 l2 = 0
    • e.g (001) is perpendicular to (100) and (010). (110) is perpendicular to ( 11- 0).
    • 4) Two directions u1 v1 w1 and u2 v2 w 2 are normal if u1 u2 + v1 v2 + w1 w2 = 0 e.g [100] is perpendicular to [001]. [111] is perpendicular to [112-].
    All About Metallurgical & Materials Engineering Download This & More Stuff @ WWW.07MET.TK