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Meeting MS&T21: Materials Science & Technology
Symposium Deformation-induced Phase Transformations
Presentation Title Wire Size Effect on the Nucleation of Fatigue Cracks Near Non-metallic Inclusions in Superelastic Nitinol
Author(s) Parisa Shabani Nezhad, Jacob Rusch, John A Moore, Dinc Erdeniz
On-Site Speaker (Planned) Parisa Shabani Nezhad
Abstract Scope Nitinol is a near-equiatomic alloy of nickel and titanium which has a wide range of applications due to its outstanding functional properties, such as shape memory and superelastic behavior. Superelastic nitinol wires, often used for the fabrication of stents, exhibit recoverable strains that are significantly greater than traditional alloys. This property arises from the transformations between the two phases, austenite and martensite, that it adopts near room temperature. In most of its applications, nitinol is cycled between these two phases, which results in functional and/or structural fatigue that ultimately leads to failure. It has been shown that the main fatigue crack initiation sites, other than surfaces, are microstructural inhomogeneities such as voids and non-metallic inclusions. In this work, nitinol wires with three different sizes are subjected to microstructural analysis and low-cycle fatigue tests to understand the effect of wire size on phase transformations and fatigue crack nucleation around non-metallic inclusions.


Accounting for Phase Transformation in Plastic Anisotropy Modeling of SS316L
Analysis of Stress State of Plastic Medium Influence on Structural Transformations in Low-alloy Steels
Ausforming of Ferrium M54 Ultra-high Strength Steel
Engineering Microstructures for Conventionally and Additively Manufactured Ni-based Superalloys
Influence of 3D Microstructure on Deformation-induced Martensitic Transformation Studied by In Situ High-energy Diffraction Microscopy and Crystal Plasticity Modeling
Intrinsic Coupling between Deformation Twinning and Phase Transformation in NiTi Shape Memory Alloys and Metastable Beta Ti-alloys
Localized Phase Transformation at Stacking Faults and the Corresponding Alloy Design Strategy
P1-18: Bimetallic Billets for Magnesium-thermal Production of High Quality Sponge Titanium
P1-19: High-cut Steel Property Researches For Taps’ Manufacture
Solid Phase Plasticity Mechanisms in Metals and Rocks during Shear Deformation
Wire Size Effect on the Nucleation of Fatigue Cracks Near Non-metallic Inclusions in Superelastic Nitinol

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