TY - JOUR
T1 - Scanning probe microscopy study of grain boundary migration in nial
AU - Rabkin, Eugen
AU - Amouyal, Yaron
AU - Klinger, Leonid
N1 - Funding Information:
This research was supported by the Binational US–Israel Science Foundation under the Grant No. 2000066. Dr. A. Fraczkiewicz from Ecole des Mines de Saint Etienne is heartily acknowledged for supplying us with the NiAl samples. Helpful discussions with Prof. Y. Mishin from the George Mason University are heartily appreciated.
PY - 2004/10/4
Y1 - 2004/10/4
N2 - A post-mortem scanning probe microscopy (SPM) study of grain boundary migration in Ni-rich NiAl at 1400°C is presented. The migration of grain boundaries during annealing is quantified using the SPM measurements of surface topography of the regions swept by migrating grain boundaries. It is shown that the quantitative conclusions about the dynamics of grain boundary motion can be drawn from the study of surface topography in the vicinity of both individual migrated boundaries and migrated triple junctions. In the case of individual boundaries, the curvature of the blunted root of the grain boundary groove formed at original boundary position provides the information about the beginning of migration process. In the case of triple junctions that moved along one of three boundaries forming the junction, the variable width of the grain boundary groove allows to recover the dynamics of migration process. Using the Mullins model of grain boundary grooving and its modifications we estimated that the grain boundary migration rate is 0.52 ±0.09 μm/s. This is much higher than the average migration rate obtained by dividing the migrated distance by total annealing time. It is concluded that in the near-surface region of NiAl the grain boundaries migrate in jerky, spasmodic fashion.
AB - A post-mortem scanning probe microscopy (SPM) study of grain boundary migration in Ni-rich NiAl at 1400°C is presented. The migration of grain boundaries during annealing is quantified using the SPM measurements of surface topography of the regions swept by migrating grain boundaries. It is shown that the quantitative conclusions about the dynamics of grain boundary motion can be drawn from the study of surface topography in the vicinity of both individual migrated boundaries and migrated triple junctions. In the case of individual boundaries, the curvature of the blunted root of the grain boundary groove formed at original boundary position provides the information about the beginning of migration process. In the case of triple junctions that moved along one of three boundaries forming the junction, the variable width of the grain boundary groove allows to recover the dynamics of migration process. Using the Mullins model of grain boundary grooving and its modifications we estimated that the grain boundary migration rate is 0.52 ±0.09 μm/s. This is much higher than the average migration rate obtained by dividing the migrated distance by total annealing time. It is concluded that in the near-surface region of NiAl the grain boundaries migrate in jerky, spasmodic fashion.
KW - Grain boundaries
KW - Grain boundary migration
KW - Scanning probe microscopy
UR - http://www.scopus.com/inward/record.url?scp=4544232031&partnerID=8YFLogxK
U2 - 10.1016/j.actamat.2004.06.027
DO - 10.1016/j.actamat.2004.06.027
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AN - SCOPUS:4544232031
SN - 1359-6454
VL - 52
SP - 4953
EP - 4959
JO - Acta Materialia
JF - Acta Materialia
IS - 17
ER -