Simulation of Microstructure in Two-Dimensional Martensitic Polycrystalline Films
Date Issued
2009
Date
2009
Author(s)
Chou, Wei-Nien
Abstract
Our team proposed a framework based on constrained theory, to establish evolution of microstructure in martensitic polycrystalline films. In this theory, the evolution converges by energy restraining gradually. We observed the arrangement of the microstructure of the bottom energy. We study the microstructure according to the arrangement as well as its evolutionary process of polycrystalline, and compute the stress with fast algorithm (FFT). We design a simple model which is two-dimensional two crystals film, and give one angle θ degree rotation to distinguish from another, we observe the compatibility of the grain boundary.n addition, we carry on the numerical simulation in another case, the thin film model is exerted by each kind of strain. We draw up with the strain and the result ofimulation, and keep observing the difference between the single crystal and poly crystal micro structure.n poly crystal, the grain micro structure change depend on the θ degree rotation, but the grain boundary lack for compatibility, for all this, there is no strain of holeodel attribute to the evolution of micro structure inside, under the bottom energy.he exerted strain and the variant can be drawn up the hysteresis loop. We have compared the single crystal and the poly crystals in the different thickness, and findhe the influence of thickness is not conspicuous. And in the same other conditions, the crystals are more complex, more exerted strain is needed to urge the switch.
Subjects
Microstructure
Polycrystalline Film
Hysteresis loop
Type
thesis
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