Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys

Ramos, Alana Pereira; Castro, Walman Benı́cio de; Costa, Josiane Dantas; Santana, Renato Alexandre Costa de

doi:10.1590/1980-5373-mr-2018-0604

Cited by 13 publications

(2 citation statements)

References 45 publications

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“…For the Ni-Ti binary alloy, the martensite and austenite phases were identified. The coexistence of the austenite and martensite phases in diffractograms was also observed by other authors [21,26,35]. The monoclinic martensite phase (B19') was identified by comparing with the chart (2107170) in the planes (002), (−111), (020), (012), (022) and with chart (9015733) in the plane (011).…”

Section: X-ray Diffractionsupporting

confidence: 67%

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: X-ray Diffractionsupporting

confidence: 67%

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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“…Due to the high cost associated with Pd, Pt, and Au, as alloying metals to NiTi, metals like hafnium (Hf) and zirconium (Zr) have been investigated to extend the commercial viability [88,89]. The composition Ni 50 .…”

Section: Characteristic Properties and Features Of Nitimentioning

confidence: 99%

An Intermetallic NiTi-Based Shape Memory Coil Spring for Actuator Technologies

Shimoga

Kim

2021

Metals

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Amongst various intermetallic shape memory alloys (SMAs), nickel–titanium-based SMAs (NiTi) are known for their unique elastocaloric property. This widely used shape remembering material demonstrates excellent mechanical and electrical properties with superior corrosion resistance and super-long fatigue life. The straight-drawn wire form of NiTi has a maximum restorable strain limit of ~4%. However, a maximum linear strain of ~20% can be attained in its coil spring structure. Various material/mechanical engineers have widely exploited this superior mechanic characteristic and stress-triggered heating/cooling efficiency of NiTi to design smart engineering structures, especially in actuator technologies. This short technical note reflects the characteristics of the NiTi coil spring structure with its phase transformations and thermal transformation properties. The micro-actuators based on NiTi have been found to be possible, suggesting uses from biomedical to advanced high-tech applications. In recent years, the technical advancements in modular robotic systems involving NiTi-based SMAs have gained speculative commercial interest.

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Tailored Behaviour of Scrap Copper Matrix Composites Reinforced with Zinc and Aluminium: Low Cost Shape Memory Structures

Mihlyuzova¹,

Enginsoy²,

Dontchev³

et al. 2021

Mechanics of Composite, Hybrid and Multifunctional Materials , Volume 6

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Influence of Zirconium Percentage on Microhardness and Corrosion Resistance of Ti50 Ni50-xZrx Shape Memory Alloys

Cited by 13 publications

References 45 publications

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

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

An Intermetallic NiTi-Based Shape Memory Coil Spring for Actuator Technologies

Tailored Behaviour of Scrap Copper Matrix Composites Reinforced with Zinc and Aluminium: Low Cost Shape Memory Structures

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