Experimental study on temperature evolution and strain rate effect on phase transformation of TiNi shape memory alloy under shock loading

Liu, Yonggui; Shan, Ling-yan; Shan, Junfang; Hui, Mengmeng

doi:10.1016/j.ijmecsci.2019.04.005

Cited by 22 publications

(8 citation statements)

References 48 publications

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“…A relationship between temperature and voltage needs to be established before the actual test. More details of each of the components of the system and calibration process are given in [17,18]. A typical strain and temperature and wave signal for PE and SME is shown in Figure 2b,c, respectively.…”

Section: Materials and Methodologymentioning

confidence: 99%

Strain Rate Dependence of Hardness for PE and SME TiNi Alloys

Shen

Hui

Liu

2020

Metals

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In this paper, the strain rate dependence of hardening behavior of polycrystalline pseudoelastic (PE) and shape memory effect (SME) TiNi alloy under impact loading was investigated by experiments. Measurements of stress–strain curves, hardening modulus, hysteresis loop area, and temperature variation are synchronized using in situ infrared detector system at the strain rate range from 300/s to 2000/s. It is shown that with the strain rate increasing, for PE specimens, strain rate hardening is observed, while SME specimens perform a strong nonlinear strain hardening. The results of synchronous temperature measurement show that in stress-temperature space, for PE samples, the dynamic transformation path is strain rate independent, but for the SME samples, the opposite is true. Thermal-mechanical coupling does not seem to explain this difference, and hardening from microstructure variation should be considered for such difference.

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Section: Materials and Methodologymentioning

confidence: 99%

Strain Rate Dependence of Hardness for PE and SME TiNi Alloys

Shen

Hui

Liu

2020

Metals

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“…Contrariwise, we should next consider the wave structure Figure 9(c). Similarly, from the corresponding elementary waves (19) 1 and (21), we can obtain the following equations for the seven unknowns…”

Section: Solution and Wave Structurementioning

confidence: 99%

“…It has been determined experimentally and analytically that the SMAs with softening behaviors have up-down-up constitutive responses [8][9][10]. Extensive studies on dynamical problems of SMAs with hardening stress-strain curves have been reported [11][12][13][14][15][16][17][18][19]. But due to the complexity of mechanical behaviors, studies on wave propagation of those SMAs with softening responses are still insufficient.…”

Section: Introductionmentioning

confidence: 99%

Wave propagation in a non-linearly elastic bar with phase transformations

Zhu

Zhong

2022

Mathematics and Mechanics of Solids

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There exist considerable difficulties in studying the wave propagation problems of the kind of phase transforming materials with non-monotone material responses due to the lack of uniqueness of solution for a moving phase boundary. An admissibility condition, which is named the Maxwell equal-area criterion, was established from a three-dimensional (3D) internal-variable formulation in the previous study to supplement the one-dimensional (1D) dynamical system of the bars/rods made of the special materials to determine the phase boundary uniquely. In this paper, we employ this criterion to investigate the wave propagation in the bar made of the special kind of phase transforming materials, which are associated with trilinear non-monotone stress–strain responses. The Riemann problem for different boundary states that arises from wave encounters are analyzed by the method of wave curves. Based on the construction of the Riemann solution, we explicitly study the wave propagation in a semi-infinite bar under an impulsive stress impact to explore the dynamical features of the special materials. The wave structures in the entire spatial and temporal domain for two different impact levels are obtained, as well as the state profiles. Detailed analyses and discussions of the wave patterns and wave encounters occurring during the wave propagation process are given for a deep understanding of dynamical phase transitions of the materials. These results are further compared with those obtained using the artificially adopted maximal dissipation rate criterion. The similarities and differences are discussed. The comparisons further confirmed that the special phase transforming material can be used for designing wave-absorption/impact-protection devices.

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“…[11] It is known that thermomechanical responses of SMAs are strain rate dependent. [12][13][14] For example, at higher strain rates, the elastic limit at which phase transformation occurs is higher than at a quasi-static strain rate. [13] It is also known that the dynamic elastic limit increases as the grain size and the martensitic transformation temperature decrease.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of Shock Strength Exhibited by a Nickel‐Rich Nickel‐Titanium‐Hafnium Alloy

Knapp,

Amin-Ahmadi,

Turnage

et al. 2023

Adv Eng Mater

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Nickel‐rich NiTiHf alloys that are heat treated to strengthen the microstructures with a dense distribution of Ni4Ti3 nanoprecipitates exhibit very high strengths and good quasi‐static indentation resistance and rolling contact fatigue performances. To determine whether these properties are maintained at high rates of loading, in‐situ and recovery flyer plate impact shock experiments were performed on a Ni54Ti45Hf1 alloy at impact velocities ranging from approximately 150 m/s (2.5 GPa) to 700 m/s (12.40 GPa). Analysis of shocked samples indicated less cracking was observed to emanate from spall failures resulting from impact velocities greater than 250 m/s (4.23 GPa), concurrent with observations of intragranular microbands within the microstructures. Analyses showed clear evidence that, like responses to quasi‐static loading, martensitic phase transformation occurred upon shock compression in all cases. However, dissimilarly, for the higher impact velocities it reversed upon stress release, leaving behind microbands that showed no evidence for retained martensite and within which the Ni4Ti3 nanoprecipitates dissolved. These results indicate that strain‐rate dependence of these SMAs under shock loading are not only governed by expected physics of rate‐dependence of the martensitic transformations themselves but may also be enhanced by inelastic deformation mechanisms that result in precipitate dissolution.This article is protected by copyright. All rights reserved.

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Experimental study on temperature evolution and strain rate effect on phase transformation of TiNi shape memory alloy under shock loading

Cited by 22 publications

References 48 publications

Strain Rate Dependence of Hardness for PE and SME TiNi Alloys

Strain Rate Dependence of Hardness for PE and SME TiNi Alloys

Wave propagation in a non-linearly elastic bar with phase transformations

Mechanisms of Shock Strength Exhibited by a Nickel‐Rich Nickel‐Titanium‐Hafnium Alloy

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