A novel criterion for determining the optimum value of twist in the topological model of martensitic phase transformations

作者：Ma, Xiao; Wei, Zhaozhao; Zhang, Xinping

来源：International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2015, PTM 2015, Whistler, BC, Canada, 2015-06-28 To 2015-07-03.

• Analysis and calculations
• Coherent structure
• FeNi alloys
• Martensite transformations
• Martensitic phase transformations
• Phenomenological theory
• Topological models
• Transformation mechanisms

Recently, a topological model of martensitic phase transformations has been presented wherein the habit plane is a semi-coherent structure, and the transformation mechanism is shown explicitly to be diffusionless. A novel criterion for determining the optimum value of twist in predicting the martensite transformation crystallography is proposed under the framework of the topological model, so that the predicted interfacial defects are not only able to fulfill the function of fully accommodating the coherency strains, but also capable of reaching the required exact position at the habit plane. Numerical analysis and calculation for an Fe-31wt.%Ni alloy was demonstrated based on the present criterion and the results so obtained are in good agreement with the classical phenomenological theory and published experimental measurements.

• 出版日期2015
• 单位华南理工大学