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A chemical-structural model for coherent martensite/parent interface in Mn-based antiferromagnetic shape memory
1School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, 200240 Shanghai, China. jfwan@sjtu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|November 3, 2016
Summary
A new model quantifies interfacial energy in manganese-based shape memory alloys (SMAs). Structural energy dominates, decreasing with temperature, and is influenced by preferred orientation, crucial for alloy performance.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Metallurgy
Background:
- The martensite/parent coherent interface is key to understanding shape memory effects in Mn-based alloys.
- Research into reversible and magnetic shape memory effects relies on characterizing this interface.
Purpose of the Study:
- To propose a chemical-structural model for calculating the interfacial energy of Mn-based shape memory alloys (SMAs).
- To investigate the contributions of chemical and structural components to the total interfacial energy.
- To analyze the influence of temperature, composition, and preferred orientation on interfacial properties.
Main Methods:
- Development of a chemical-structural model for interfacial energy calculation.
- Decomposition of interfacial energy into chemical (bond energy) and structural (strain energy) parts.
- Analysis of temperature, alloy composition, and preferred orientation effects on interfacial energy.
Main Results:
- Structural interfacial energy is the dominant factor in the total interfacial energy.
- Total interfacial energy decreases with increasing temperature for fixed alloy composition.
- Preferred orientation significantly influences the total interfacial energy.
- Interfacial energy, entropy, enthalpy, and heat capacity are correlated with temperature and preferred orientation.
Conclusions:
- The proposed model provides a framework for understanding interfacial behavior in Mn-based SMAs.
- Structural factors and temperature play critical roles in determining interfacial energy.
- Alloy composition and crystallographic orientation are important parameters for tailoring SMA properties.
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