Poisson's Ratio and Young's Modulus of TiNi Shape Memory Alloy Measured by Electromagnetic Acoustic Transducer

Mita, Toshihiro; Kawashima, Katsuhiro; Misumi, Masaaki; Okubo, Masashi

doi:10.1299/kikaia.76.290

Cited by 6 publications

(1 citation statement)

References 10 publications

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“…Therefore, the larger W e value for the NiTi alloy was attributed to the elastic strain contributing to a larger proportion of the same total strain because the Young’s modulus was lower. The Young’s moduli of NiTi, iron/steel (including stainless steel), copper, and tungsten are 60 GPa [ 32 ], 190–220 GPa [ 33 ], 105–130 GPa [ 33 ], and 370 GPa [ 33 ], respectively. Meanwhile, as shown in Figure 4 , W p decreased with increasing H , and the values for all materials followed a single curve (except the NiTi alloy, which showed a value below this curve).…”

Section: Resultsmentioning

confidence: 99%

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

2021

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Nanoindentation testing using a Berkovich indenter was conducted to explore the relationships among indentation hardness (H), elastic work energy (We), plastic work energy (Wp), and total energy (Wt = We + Wp) for deformation among a wide range of pure metal and alloy samples with different hardness, including iron, steel, austenitic stainless steel (H ≈ 2600–9000 MPa), high purity copper, single-crystal tungsten, and 55Ni–45Ti (mass%) alloy. Similar to previous studies, We/Wt and Wp/Wt showed positive and negative linear relationships with elastic strain resistance (H/Er), respectively, where Er is the reduced Young’s modulus obtained by using the nanoindentation. It is typically considered that Wp has no relationship with We; however, we found that Wp/We correlated well with H/Er for all the studied materials. With increasing H/Er, the curve converged toward Wp/We = 1, because the Gibbs free energy should not become negative when indents remain after the indentation. Moreover, H/Er must be less than or equal to 0.08. Thermodynamic analyses emphasized the physical meaning of hardness obtained by nanoindentation; that is, when Er is identical, harder materials show smaller values of Wp/We than those of softer ones during nanoindentation under the same applied load. This fundamental knowledge will be useful for identifying and developing metallic materials with an adequate balance of elastic and plastic energies depending on the application (such as construction or medical equipment).

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Section: Resultsmentioning

confidence: 99%

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

2021

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Deformation of Nickel Titanium Single Crystal under Compressive Pulse

Krivosheina

Tuch

2021

Russ Phys J

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Variation of Poisson’s Ratio of NiTi During Pseudoelastic Deformation

Shariat,

Liu

2023

Shap. Mem. Superelasticity

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NiTi alloy exhibits a stress-induced B2 ↔ B19' martensitic transformation. This transformation is practically isochoric, thus has a Poisson’s ratio of 0.5. This imposes a complex interaction with elastic deformation which has a lower Poisson’s ratio and with plastic deformation which is not recoverable when interacting with other materials in a composite or an assembly, thus a challenge for the design of such materials or devices using them. This study investigated the variation of the Poisson’s ratio of a NiTi alloy during pseudoelastic deformation by means of the digital image correlation technique. The Poisson’s ratio of the alloy was found to increase from 0.39 in the apparent elastic deformation stage to 0.44 prior to the onset of the Lüders-type deformation and then to 0.48 after the passing of the Lüders band.

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Poisson's Ratio and Young's Modulus of TiNi Shape Memory Alloy Measured by Electromagnetic Acoustic Transducer

Cited by 6 publications

References 10 publications

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

Hardness–Deformation Energy Relationship in Metals and Alloys: A Comparative Evaluation Based on Nanoindentation Testing and Thermodynamic Consideration

Deformation of Nickel Titanium Single Crystal under Compressive Pulse

Variation of Poisson’s Ratio of NiTi During Pseudoelastic Deformation

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