The effect of boundary or interface on stress-induced martensitic transformation in a Fe-Ni alloy

Man, Tinghui; Ohmura, Takahito; Tomota, Yō

doi:10.1016/j.mtcomm.2020.100896

Cited by 9 publications

(10 citation statements)

References 29 publications

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“…Laplanche et al suggested the occurrence of twin formation and phase transformation in NiTi alloys [ 220 ]. The phase-transformation-induced plasticity (TRIP) effect is expected to be a novel idea for obtaining a better performance in strength–ductility balance in steel, and many studies have approached this behavior by indentation [ 222 , 223 , 224 , 225 , 226 , 227 , 228 , 229 ]. Lu et al analyzed the indentation-induced mechanical behavior of retained austenite in a bearing steel [ 222 ].…”

Section: Other Mechanisms Of the Eventmentioning

confidence: 99%

“…They showed that the pop-in phenomenon corresponded to the strain-induced martensitic transformation, and the stability of the austenite phase depended on the local C content. Fe–C alloys and Fe–Ni alloys were analyzed to clarify the stabilizing factors of the austenite phase, including a constraint by the surrounding harder phases of the as-quenched and/or tempered martensite phases [ 226 , 227 ].…”

Section: Other Mechanisms Of the Eventmentioning

confidence: 99%

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Pop-In Phenomenon as a Fundamental Plasticity Probed by Nanoindentation Technique

Ohmura

Wakeda

2021

Materials

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The attractive strain burst phenomenon, so-called “pop-in”, during indentation-induced deformation at a very small scale is discussed as a fundamental deformation behavior in various materials. The nanoindentation technique can probe a mechanical response to a very low applied load, and the behavior can be mechanically and physically analyzed. The pop-in phenomenon can be understood as incipient plasticity under an indentation load, and dislocation nucleation at a small volume is a major mechanism for the event. Experimental and computational studies of the pop-in phenomenon are reviewed in terms of pioneering discovery, experimental clarification, physical modeling in the thermally activated process, crystal plasticity, effects of pre-existing lattice defects including dislocations, in-solution alloying elements, and grain boundaries, as well as atomistic modeling in computational simulation. The related non-dislocation behaviors are also discussed in a shear transformation zone in bulk metallic glass materials and phase transformation in semiconductors and metals. A future perspective from both engineering and scientific views is finally provided for further interpretation of the mechanical behaviors of materials.

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Section: Other Mechanisms Of the Eventmentioning

confidence: 99%

Section: Other Mechanisms Of the Eventmentioning

confidence: 99%

Pop-In Phenomenon as a Fundamental Plasticity Probed by Nanoindentation Technique

Ohmura

Wakeda

2021

Materials

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“…24) A similar study was also reported by Tsurekawa et al 12) Also, in material in which the strain-induced transformation appears, the resistance change by the transition from phase transformation to plastic deformation is quantitatively detected as an increase in ¡, and it has been shown that the rate of increase depends on the distance from the grain boundary and the strength of the adjacent grain. 33,34) It is considered that the evaluation by ¡ is more sensitive for detecting differences in the plasticity resistance of the grain boundary than the evaluation of hardness because the h 2 term, which corresponds to the essential plasticity resistance, can be evaluated in the analysis by the P/hh curve. 24,33,34) B segregation might be a probable reason for the improved local mechanical properties in the vicinity of the grain boundary.…”

Section: Effect Of B Addition On Local Mechanical Properties In Vicinity Of Grain Boundary Of If Steelmentioning

confidence: 99%

“…33,34) It is considered that the evaluation by ¡ is more sensitive for detecting differences in the plasticity resistance of the grain boundary than the evaluation of hardness because the h 2 term, which corresponds to the essential plasticity resistance, can be evaluated in the analysis by the P/hh curve. 24,33,34) B segregation might be a probable reason for the improved local mechanical properties in the vicinity of the grain boundary. Figure 11(a) and (b) show the 3D atom maps of C, Ti, B, and all elements obtained from the IF and IF-B steels, respectively.…”

Section: Effect Of B Addition On Local Mechanical Properties In Vicinity Of Grain Boundary Of If Steelmentioning

confidence: 99%

Effects of Grain Boundary Geometry and Boron Addition on the Local Mechanical Behavior of Interstitial-Free (IF) Steels

Endoh¹,

Kimura

et al. 2021

Mater. Trans.

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Nanoindentation measurements on various grain boundaries were performed to clarify the effects of the geometry of neighboring grains and the addition of boron (B) on plasticity resistance in the vicinity of grain boundaries in interstitial free (IF) steels. We define a parameter, ¡, which is measured by the slope of a P/hh curve with load, P, and displacement, h, to estimate the resistance against plastic deformation in the grain interior and at the grain boundaries. The value of ¡ is almost constant with the geometric compatibility factor of the grain boundaries. This result shows that the geometry of the neighboring grains does not affect the plasticity resistance of the grain boundaries. However, the value of ¡ increases by the addition of B due to the segregation of B and Ti to the grain boundaries. It is indicated that the elemental segregation to the grain boundaries enhances the resistance to the plastic deformation in the vicinity of the grain boundaries.

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“…In addition, the test method is applicable for the characterization of nano-and microscopic mechanical behaviors through the control of the magnitude of the applied load. Therefore, instrumented indentation tests have been widely employed in material science and engineering, e.g., the studies of scale-dependent plasticity [1][2][3], microscopic heterogeneity [4][5][6], and complex deformation mechanisms [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests

2021

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Instrumented indentation tests are an efficient approach for the characterization of stress–strain curves instead of tensile or compression tests and have recently been applied for the evaluation of mechanical properties at elevated temperatures. In high-temperature tests, the rate dependence of the applied load appears to be dominant. In this study, the strain-rate-dependent plasticity in instrumented indentation tests at high temperatures was characterized through the assimilation of experiments with a simulation model. Accordingly, a simple constitutive model of strain-rate-dependent plasticity was defined, and the material constants were determined to minimize the difference between the experimental results and the corresponding simulations at a constant high temperature. Finite element simulations using a few estimated mechanical properties were compared with the corresponding experiments in compression tests at the same temperature for the validation of the estimated material responses. The constitutive model and determined material constants can reproduce the strain-rate-dependent material behavior under various loading speeds in instrumented indentation tests; however, the load level of computational simulations is lower than those of the experiments in the compression tests. These results indicate that the local mechanical responses evaluated in the instrumented indentation tests were not consistent with the bulk responses in the compression tests at high temperature. Consequently, the bulk properties were not able to be characterized using instrumented indentation tests at high temperature because of the scale effect.

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The effect of boundary or interface on stress-induced martensitic transformation in a Fe-Ni alloy

Cited by 9 publications

References 29 publications

Pop-In Phenomenon as a Fundamental Plasticity Probed by Nanoindentation Technique

Pop-In Phenomenon as a Fundamental Plasticity Probed by Nanoindentation Technique

Effects of Grain Boundary Geometry and Boron Addition on the Local Mechanical Behavior of Interstitial-Free (IF) Steels

Characterization of the Strain-Rate-Dependent Plasticity of Alloys Using Instrumented Indentation Tests

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