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Thermomechanical andmicrostructural characterizationof Co49Ni21Ga30 and Co38Ni33Al29 high-temperature shape memory alloy single crystals / Jayaram Dadda. 2009
Inhalt
Nomenclature
Introduction and Scope of Research
1 Theoretical Background
1.1 Shape Memory Alloys
1.2 Reversible Martensitic Transformation
1.3 Thermodynamic Aspects of the Martensitic Transformations
1.4 Shape Memory Effect (SME)
1.5 Pseudoelasticity (PE)
1.6 Two-way Shape Memory Effect (TWSME)
1.7 Cyclic stress-strain response (CSSR) of Shape Memory Alloys
1.8 Co-base Alloys
2 Material and Experimental Procedures
2.1 Material and Sample Preparation
2.2 Thermo-mechanical Experiments
2.3 Microscopy and Digital Image Correlation
2.4 Electron Microscopy, DSC and SQUID
3 Characterization of Shape Memory Behavior in Co38Ni33Al29 and Co49Ni21Ga30 Alloys
3.1 Introduction
3.2 Analysis of Results and Discussion
3.2.1 Stress-assisted Shape Memory Effect
3.2.2 Pseudoelasticity
3.3 Chapter Summary
4 Co49Ni21Ga30-alloys as a High-temperature Pseudoelastic Material
4.1 Introduction
4.2 Microstructure-pseudoelastic property relationships
4.2.1 Mechanical property variation with temperature
4.2.2 Evolution of microstructure with temperature during SIM transformations
4.2.2.1 Region I - Constant low stress hysteresis
4.2.2.2 Region II - Increasing stress hysteresis
4.3 Effect of Training on the Pseudoelasticity
4.4 Chapter Summary
5 Cyclic Stability of Co49Ni21Ga30 Single Crystals
5.1 Introduction
5.2 Cyclic Stress-Strain Response at Ambient Temperatures
5.3 Cyclic deformation behavior at elevated temperatures
5.4 Chapter Summary
6 Summary & Future Research
References
Vita
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