Enhanced internal friction and specific strength of porous TiNi shape memory alloy composite by the synergistic effect of pore and Ti2Ni

Peng, Weiliang; Li, Kai; Shah, Basit Ali; Gao, Yan; Zhu, Min

doi:10.1016/j.jallcom.2019.152578

Cited by 14 publications

(3 citation statements)

References 25 publications

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“…Due to the methodological difficulties of tensile testing, the deformation behavior of porous samples is more often investigated by the compression or torsion methods [4][5][6][7][8][9][10][11]. At that, it is easier to prepare samples for testing, and the requirements for the isotropy of equiaxial samples are not as high as at stretching plates.…”

Section: Introductionmentioning

confidence: 99%

Peculiarities of deformation and destruction of porous titanium nickelide alloys at stretching, compression and bending

Marchenko¹,

Baigonakova²,

Garin³

et al. 2022

nfm

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The analysis of experimental data obtained during quasi-static tension, compression and bending of anisotropic and structurally inhomogeneous porous titanium nickelide alloys obtained by the method of self-propagating high-temperature synthesis (SHS) is carried out. It is shown that the studied porous titanium nickelide alloy near room temperature is in a pre-martensitic state and experiences a reversible martensitic transformation (MT) under the action of an external load. The influence of geometric anisotropy on the deformation behavior under tension and bending is shown. By means of quasi-static tension and three-point bending to failure of lamellar samples of porous titanium nickelide with a porosity of 60-70%, it was shown for the first time that all obtained strain curves are qualitatively self-similar and contain a basic block of two linear hardening sections and a yield section between them. It is shown for the first time that a decrease in the effective cross section and a decrease in the degree of geometric anisotropy of the deformation zone lead to the appearance of an additional yield region on the deformation curves of quasi-static tension. This indicates a significant dependence of the contribution of reversible martensitic deformation to the total deformation on the geometric anisotropy of porous titanium nickelide. An analysis of fracture surfaces showed the effect of the type and rate of loading on the ratio of brittle martensitic and ductile austenite phases in a multiphase matrix of a porous titanium nickelide alloy.

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Section: Introductionmentioning

confidence: 99%

Peculiarities of deformation and destruction of porous titanium nickelide alloys at stretching, compression and bending

Marchenko¹,

Baigonakova²,

Garin³

et al. 2022

nfm

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show abstract

“…A well-developed volumetric structure of these materials plays a certain role here, since it is close in anatomical parameters to the biological bone tissues of the human body [4,[11][12][13]. Changes in the parameters of shape memory effects and temperature ranges of martensitic transformations for sintered porous alloys with Co additives are covered in [14][15][16][17]. In these studies, porous-sintered TiNi-based alloys were investigated.…”

Section: Introductionmentioning

confidence: 99%

“…The generally accepted method used for investigating the deformation behaviour and assessing fracture via deformation diagrams for porous materials is the compression method [17,18]. In this research, the analysis of the stages of deformation and the dynamics of the fracture process for porous sintered alloys, to the best of our knowledge, was carried out under the conditions of tensile deformation for the first time.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

et al. 2021

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This research investigates the effect of cobalt on the deformation behaviour of a porous TiNi-based alloy that was obtained by sintering. Porous TiNi-based alloys with cobalt additives, accounting for 0–2 at. % and with a pitch of 0.5, were obtained. The structural-phase state of the porous material was researched by X-ray structural analysis. The effect of different amounts of Co (used as an alloying additive) on the deformation behaviour was investigated by tensile to fracture. The fractograms of fracture of the experimental samples were analysed using scanning electron microscopy. For the first time, the present research shows a diagram of the deformation of a porous TiNi-based alloy that was obtained by sintering under tensile. The stages of deformation were described according to the physical nature of the processes taking place. The effect of the cobalt-alloying additive on the change in the critical stress of martensitic shear was investigated. It was found that the behaviour of the concentration dependency of stress at concentrations under 1.5 at. % Co was determined by an increase in the stress in the TiNi solid solution. This phenomenon is attributed to the arrangement of Co atoms on the Ti sublattice, as well as an increase in the fraction of the B19′ phase in the matrix. The steep rise of the developed forces on the concentration dependency of the martensitic shear stress at 2 at. % Co is presumably attributed to the precipitation hardening of austenite due to the precipitation of finely dispersed coherent Ti3Ni4 phase following the decrease of fraction of martensite. An analysis of fractograms showed that as more cobalt was added, areas of fracture with traces of martensite plates of the B19′ phase started to prevail. At 2 at. % Co these plates fill almost the entire area of the fracture. The research findings presented in this work are of great importance, since they can be used to achieve the set of physical and mechanical properties required for the development of biocompatible materials for implantology.

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NiTi/PMMA Biocomposite: in Situ Polymerization, Microstructure and Mechanical Property

2022

Trans Indian Inst Met

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Enhanced internal friction and specific strength of porous TiNi shape memory alloy composite by the synergistic effect of pore and Ti2Ni

Cited by 14 publications

References 25 publications

Peculiarities of deformation and destruction of porous titanium nickelide alloys at stretching, compression and bending

Peculiarities of deformation and destruction of porous titanium nickelide alloys at stretching, compression and bending

The Effect of Cobalt on the Deformation Behaviour of a Porous TiNi-Based Alloy Obtained by Sintering

NiTi/PMMA Biocomposite: in Situ Polymerization, Microstructure and Mechanical Property

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