TY - JOUR
T1 - Kinetic description for solid-state transformation using an approach of summation/product transition
AU - Jiang, Yi Hui
AU - Liu, Feng
AU - Sun, Bao
AU - Song, Shao Jie
AU - Zhang, Zhong Hua
PY - 2014/7
Y1 - 2014/7
N2 - In a recent work by the present authors, an analytical kinetic model has been derived for solid-state phase transformations on the basis of summation/product transition. In the present paper, this approach is extended to models that describe transformations involving various time synchronous and time asynchronous sub-processes. According to the newly proposed models, several interesting kinetic phenomena are revealed: negative sub-processes are responsible for the decreasing tendency of Avrami exponent; the evolution of overall kinetic parameters during time synchronous transformation reflects the relative contributions from different sub-processes; the mechanism of transformation subject to Avrami nucleation can be regarded as a combination of various time synchronous sub-processes; a process due to continuous nucleation is equal to the total effect of infinitely many sub-processes due to sitesaturation starting at different times; and abnormal results of Avrami plot in time asynchronous transformation are due to a sudden change in transformation mechanisms. Finally, the time asynchronous model is applied successfully to describe the crystallizations of Mg-Cu-Y and Zr-Cu-Al amorphous alloys, measured by differential scanning calorimetry.
AB - In a recent work by the present authors, an analytical kinetic model has been derived for solid-state phase transformations on the basis of summation/product transition. In the present paper, this approach is extended to models that describe transformations involving various time synchronous and time asynchronous sub-processes. According to the newly proposed models, several interesting kinetic phenomena are revealed: negative sub-processes are responsible for the decreasing tendency of Avrami exponent; the evolution of overall kinetic parameters during time synchronous transformation reflects the relative contributions from different sub-processes; the mechanism of transformation subject to Avrami nucleation can be regarded as a combination of various time synchronous sub-processes; a process due to continuous nucleation is equal to the total effect of infinitely many sub-processes due to sitesaturation starting at different times; and abnormal results of Avrami plot in time asynchronous transformation are due to a sudden change in transformation mechanisms. Finally, the time asynchronous model is applied successfully to describe the crystallizations of Mg-Cu-Y and Zr-Cu-Al amorphous alloys, measured by differential scanning calorimetry.
UR - http://www.scopus.com/inward/record.url?scp=84900418776&partnerID=8YFLogxK
U2 - 10.1007/s10853-014-8221-4
DO - 10.1007/s10853-014-8221-4
M3 - 文章
AN - SCOPUS:84900418776
SN - 0022-2461
VL - 49
SP - 5119
EP - 5140
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 14
ER -