Thermal, microstructural and elastic modulus behavior of Ti50Ni50−xNbx (x = 0–25%at) shape memory alloys obtained by plasma arc melting

Medeiros, Melânea Almeida Ramalho; Araújo, Carlos José de

doi:10.1016/j.jallcom.2021.158970

Cited by 5 publications

(2 citation statements)

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“…It can also be used to measure mechanical properties of materials, such as hardness and modulus of elasticity. Some works in the literature [28,[53][54][55] report using this technique to determine the hardness and modulus of elasticity of materials based on Ni-Ti.…”

Section: Microhardness and Modulus Of Elasticitymentioning

confidence: 99%

“…Given the above, there need to be more extensive studies on Ti-Ni-Mo alloys, and the lack of reports in the scientific literature on Ti-Ni-Mo alloys with percentages more significant than 2 at.% of Mo establish an evident lack of knowledge. Plasma arc melting is a method of manufacturing this alloy that allows for obtaining homogeneous alloys [28] with a low risk of contamination, and these factors are crucial to guarantee the accuracy and effectiveness of shape recovery. In addition, research relating corrosion resistance to the possible applications of these alloys is still scarce, reinforcing the need for additional studies in this field.…”

Section: Introductionmentioning

confidence: 99%

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Thermal, Mechanical, and Electrochemical Characterization of Ti50Ni50−XMox Alloys Obtained by Plasma Arc Melting

Costa,

Sousa,

Almeida

et al. 2023

Metals

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This study aims to manufacture and characterize titanium and nickel alloys with different molybdenum (Ti–Ni–Mo) contents, focusing on the influence of these additions on the microstructure, mechanical properties, and corrosion resistance. The relevance of this work stems from the lack of research on this specific alloy and the absence of reports in the literature with molybdenum percentages above 2 at.%. Ti50Ni50−XMox alloys were produced by the plasma arc melting method, with six different compositions (x = 0, 0.5, 1, 2, 3, and 4 at.% Mo), and a comprehensive analysis of microstructure, chemical composition, thermal, mechanical, and electrochemical properties was carried out. The results demonstrated significant alterations in the microstructure of the Ni–Ti alloy with the addition of molybdenum presenting several phases, precipitates (TiNi, Ti2Ni), and oxides (Ti4Ni2O, TiO, and TiO3). The stability of the B2 phase increased with molybdenum content, and the monoclinic martensite (B19′) phase was identified only in the Ni–Ti sample. Introducing molybdenum into the Ni–Ti alloy generated the R-phase and shifted the phase transformation peaks to lower temperatures, as differential scanning calorimetry (DSC) indicated. Microhardness and elastic modulus decreased with increasing Mo content, ranging from 494 HV to 272 HV and 74 GPa to 63 GPa, respectively. Corrosion tests revealed increased corrosion resistance with increasing Mo content, reaching a polarization resistance of 2710 kΩ·cm2 and corrosion current of 11.3 µA. Therefore, this study points to Ti–Ni–Mo alloys as potential candidates to increase the range of Ni–Ti alloy applications, mainly in biomaterials, reinforcing its relevance and need in current alloy research.

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Section: Microhardness and Modulus Of Elasticitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%