Hello Ali,

n is only an indication of the dimensionality of the crystallite growth. You can observe a straight line if the chrystallisation is not disturbed by other crystallites. If (for example) one crystal meet an other the dimensionality (=n=slope) also changes. I think it might be a good idea to compare only the first linear part of a graph, because in this case the growing phase (=Crystalls) is not affected by itshelf and mostly reproducable. But keep in mind that Avrami-kinetic is only an approximation to truth and does not necessarily work in all cases.

The following references can be helpful:

1. J. W. Christian, The theory of transformations of metals and alloys, Pergamon, Oxford, 1978.

2. Porter and Easterling, Phase transformations in Metals and Alloys, Van Nostrand Reinhold, 1988

@ P. Van Mourik , do you have any of these ref. I could not find....please

@ Ali Bahader:

1. The books referrred to are commonly regarded as classical textbooks on the subject. I think you can order the newest editions, if available, directly from the publisher, Amazon.com or via the international library exchange.

2. I note as Stefan Röhner does, that a physical interpretation of the Avrami- number n is rather doubtful. It can indeed hint at geometrics, but this has to be shown by corroborating evidence.

yes, n is affected by the % area selection for linear fitting of the line. And also the initial time, t0, affects your result.