Describe a-dislocations, c-dislocations and c+a dislocations, which may be possible in HCP crystals. Give specific examples from Mg and alpha-Zr. Include any citation(s) that you use to answer the question (hint: Do self-study to answer this question).
6. Below is a dislocation reaction which occurs in FCC crystals when one Frank partial
dislocation loop (imperfect/partial dislocation) with stacking fault within reacts with a Shockley
partial dislocation, leading to a perfect dislocation. (a) Fill in the missing digits of the Miller
index associated with the Burgers
reaction is vectorially feasible. (b) Prove that the following dislocation reaction is energetically
feasible.
?/3 [111] + ?/6 [???] = ?/2 [110]
7. Describe a-dislocations, c-dislocations and c+a dislocations, which may be possible in HCP
crystals. Give specific examples from Mg and alpha-Zr. Include any citation(s) that you use to
answer the question (hint: Do self-study to answer this question).
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