Plastic deformation of B19’ monoclinic martensite in NiTi shape memory alloys: HRTEM analysis of interfaces in martensite variant microstructures

Molnárová, O.; Klinger, M.; Duchoň, J.; Seiner, H.; Šittner, P.

doi:10.1016/j.actamat.2023.119242

Cited by 18 publications

(3 citation statements)

References 73 publications

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“…Numerous previous studies on the TiNi polycrystals and thin wires have shown that the typical defects in the B2-phase after plastic deformation of martensite and subsequent heating are as follows [2,7,9,19,20,23]. The <100>{011} B2 dislocation slip acts as the <001>{100} B19 slip in the corresponding B19'-martensite.…”

Section: Cvp Martensite Domain Pairsmentioning

confidence: 99%

“…The Schmid factors are calculated as follows m = cosλcosχ, where λ is the angle between the normal to the habit plane and the compression axis, χ is the angle between the shear direction and the compression axis. The crystallographic indices of the deformation axis in B19'-martensite can be determined considering the lattice correspondences between the B2-and B19'-phases (Table 3) and active CVPs with the maximum Schmid factor under compressive stress along the [111] B2 -and [001] B2 -deformation axis [7,19,20]. The [001] B2 crystal orientation in the austenite will correspond to one of the four possible {011} B19'directions in the B19'-martensite, while the [111] B2 orientation will correspond to one of the four {120} B19' directions in the B19'-martensite (Table 4).…”

Section: Cvp Martensite Domain Pairsmentioning

confidence: 99%

“…The mechanism of B19'-martensite plastic deformation has been studied in the TiNi alloy. Numerous experimental studies mainly on polycrystalline equiatomic TiNi and Ti-(50.5-50.9 at.%)Ni bars and wires report the activity of the and <001>{100} B19' dislocation slip in B19'-martensite in combination with the twinning [2,10,[19][20][21][22][23][24][25]. It should be noted that the thermo-induced martensite, existing without stress below M f temperature, consists of 24 different crystallographically equivalent internally twinned variants.…”

Section: Introductionmentioning

confidence: 99%

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Orientation Dependence of B19’-Martensite Reorientation Stress and Yield Stress in TiNi Single Crystals

Panchenko,

Eftifeeva,

Fatkullin

et al. 2023

Metals

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This paper deals with the effect of crystal orientation on the B19’-martensite reorientation stress and yield stress in compression in TiNi single crystals with different Ni contents varying from 50.4 to 51.2 at.%. It was experimentally shown that the martensite yield stress appears to be higher for the [111]B2-oriented single crystals than for the [001]B2-oriented single crystals regardless of Ni content. The difference between martensite yield stress for the two investigated orientations increases with the growth of Ni content. The maximum difference between martensite yield stress σcrM for two investigated orientations is 996 MPa at Ni content of 51.2 at.% (σcrM = 1023 MPa for the [001]B2-orientation and σcrM = 2019 MPa for the [111]B2-orientation). As a result of comparison with the B2-austenite yield stress, it was found that this is not an ordinary case. The [001]B2 orientation is a high-strength in B2-austenite and a low-strength in B19’-martensite. It was experimentally shown that the B19’-martensite reorientation stresses weakly depend on the orientation and chemical composition compared with the martensite yield stress. The reasons for the orientation dependence of the martensite yield stress in compression and the deformation mechanisms of B19’-martensite are discussed.

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Section: Cvp Martensite Domain Pairsmentioning

confidence: 99%

Section: Cvp Martensite Domain Pairsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Orientation Dependence of B19’-Martensite Reorientation Stress and Yield Stress in TiNi Single Crystals

Panchenko,

Eftifeeva,

Fatkullin

et al. 2023

Metals

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Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Dang,

Li,

Yang

et al. 2024

Advanced Materials

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Elastic materials that store and release elastic energy play pivotal roles in both macro and micro mechanical systems. Uniting high elastic energy density and efficiency is crucial for emerging technologies such as artificial muscles, hopping robots, and unmanned aerial vehicle catapults, yet it remains a significant challenge. Here, a nanocrystalline structure embedded with elliptical martensite nanodomains in ferroelastic alloys was utilized to enable high yield strength, large recoverable strain, and low energy dissipation simultaneously. As a result, the designed Ti–Ni–V alloys demonstrate ultrahigh energy density (>40 MJ m−3) with ultrahigh efficiency (>93%) and exceptional durability. This concept, which combines nano‐sized embryos to minimize energy dissipation of psuedo‐elasticity and employs a fine‐grained structure to enhance yield strength, can be applied to other ferroelastic materials. Furthermore, it holds promise for the development of phase transformation‐involved functionalities such as high‐performance dielectric energy storage, ultralow‐hysteresis magnetostrain, and high‐efficiency solid‐state caloric cooling.

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Effect of Aging Precipitation Behavior of Ti2Ni Phase on Compressive Properties of 54NiTi Alloy

Fu,

Tao,

Huang

et al. 2024

J. of Materi Eng and Perform

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Plastic deformation of B19’ monoclinic martensite in NiTi shape memory alloys: HRTEM analysis of interfaces in martensite variant microstructures

Cited by 18 publications

References 73 publications

Orientation Dependence of B19’-Martensite Reorientation Stress and Yield Stress in TiNi Single Crystals

Orientation Dependence of B19’-Martensite Reorientation Stress and Yield Stress in TiNi Single Crystals

Ultrahigh Elastic Energy Storage in Nanocrystalline Alloys with Martensite Nanodomains

Effect of Aging Precipitation Behavior of Ti2Ni Phase on Compressive Properties of 54NiTi Alloy

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