I want to determine the magnitude of the burgers vector of Al6061 an Al5083.
As you know, The magnitude is usually represented by the equation:
||b||=(a/2)(h^2+l^2+k^2)^0.5
where a is the unit cell edge length of the crystal, ||b|| is the magnitude of Burgers vector and h, k, and l are the components of the Burgers vector, b = . In most metallic materials, the magnitude of the Burgers vector for a dislocation is of a magnitude equal to the interatomic spacing of the material, since a single dislocation will offset the crystal lattice by one close-packed crystallographic spacing unit.
There are four main reflection plane in XRD, including (111), (200), (220) and (311).
Energy-since the energy per unit length of dislocation is proportional to the Burgers vector squared, b tends to be the shortest lattice translation vector.
TEM-Image with different diffraction conditions (g vectors) and the dislocation will become invisible when dot product between g and the Burgers vector is zero.
Literature-lots of published work on Al and Al alloys. Typical FCC behavior for high SFE material. I believe stacking faults have only been rarely observed.
Richard E. Ricker i am confusing how can i calculate the burger vectors in TEM. Burger vectors are used to calculate the a types dislocation and a +c and -a+c types inclined dislocations. First of all i want to know the orientation and directions by pictorial way then i want to know that how they are calculated in TEM and in theory
You measure the lattice parameter and calculate it from that. Keep in mind that lattice parameter measurements from diffraction patterns in the TEM have larger uncertainties than other techniques.
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