Study of Microstructure, Mechanical Properties, and Corrosion Behavior of As-Cast Ni-Ti and Ti-6Al-4V Alloys

Elshaer, Ramadan N.; Ibrahim, Khaled M.

doi:10.1007/s11665-022-07654-y

Cited by 16 publications

(12 citation statements)

References 50 publications

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“…The slight decrease in the hardness after quenching may be attributed to the absence of α″ phase. It has been reported that the presence of porosity reduces the elastic modulus of a component, however, it can also lead to local stress concentrations which decrease the strength, hardness, and ductility of the alloys 35 In comparison to the sample in the as-cast condition, a significant increase in hardness is observed in the TMF3 alloy upon quenching. Since the solid solution strengthening effect is common in both samples containing high Fe, it is highly possible that rapid oxidation of the intermetallic B2 phase could be responsible for increased hardness.…”

Section: Resultsmentioning

confidence: 97%

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Moshokoa,

Makhatha,

Raganya

et al. 2024

Sci Rep

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This study presents the phase analysis, microstructural characteristics, and mechanical property evaluation of the as-cast and quenched Ti–15Mo–xFe alloys with high iron content ranging from 4 to 12 weight percent. All the four alloys were produced in a vacuum-arc melting furnace. Heat treatment in the form of solution treatment was performed in a muffle furnace at a temperature of 1100 °C, with 1-h holding time and the samples were rapidly quenched in ice-brine. X-ray diffractometer (XRD) was used to analyses the phases present in each alloy whereas the optical microscope (OM) was employed to track the microstructural evolution and percentage porosity. The mechanical properties of the alloys were evaluated using a tensile test and compression test method while the micro-Vickers hardness measurements were conducted to evaluate hardness of the alloys. The XRD patterns of as-cast showed peaks belonging to the β and α″ phases and intermetallic B2 TiFe phases. The as quenched XRD peaks illustrated β phase only and Fe·Ti·O2 phases. The as-cast OM micrographs revealed equiaxed β grains, substructures, dendritic structure, and pores forming around the grain boundaries. The quenched OM showed only β equiaxed grains with pores throughout the grain boundaries. The tensile properties such as ultimate tensile strength (UTS) and elastic modulus (E) of as-cast TMF0 were 264 MPa and 79 GPa respectively and these properties changed upon quenching to 411 MPa and 66 GPa respectively. The elastic modulus of TMF1 in as-cast condition was 74 GPa. The UTS and E of TMF1, TMF2, and TMF3 in as-cast and quenched conditions were not recorded due to the fragility of the samples that failed prior to yielding any useful data. The compressive strength in as-cast and in quenched condition decreased with an increase in Fe content. The micro-Vickers hardness in as-cast and quenched conditions showed a similar trend with hardness increasing slightly upon quenching for TMF0, TMF1, and TMF3 alloys but slightly decreased in the case of TMF2. The fracture surfaces of all the as-cast and quenched alloys were comprised of ductile and brittle fracture.

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Section: Resultsmentioning

confidence: 97%

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Moshokoa,

Makhatha,

Raganya

et al. 2024

Sci Rep

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“…In a study by Elshaer and Ibrahim, they observed that a TiO 2 layer was dissolved in the presence of chloride ions (Elshaer and Ibrahim, 2022). Oxide layers are a kind of protection of metal materials against corrosion caused by a chloride environment.…”

Section: Corrosion Results Of Niti Alloysmentioning

confidence: 99%

“…They also noted that pitting corrosion occurs predominantly in NiTi alloy (Kuphasuk et al , 2001). Elshaer and Ibrahim stated that in corrosion tests with 0.9% NaCl solution with NiTi and Ti-6Al-4V alloys produced by the vacuum melting method, Ti-6Al-4V alloy has better corrosion resistance than NiTi alloy (Elshaer and Ibrahim, 2022). The best electrochemical performance is defined as the greatest polarization resistance and the lowest corrosion current density (Wei and Dejun, 2022).…”

Section: Introductionmentioning

confidence: 99%

Influence of technological synthesis conditions on corrosion behaviour and mechanical properties for NiTi alloys

Tunçay

Çuğ

Tunçay

et al. 2023

ACMM

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Purpose This study aims to investigate NiTi alloys’ characterization and corrosion behaviour produced by two different powder metallurgy (PM) methods. Design/methodology/approach It was pre-formed under a protective atmosphere at 900 °C under a force of 45 MPa and sintered for 1 h under 10–6 Mbar in an atmosphere-controlled heat treatment furnace at 1,100 °C. The relationship between microstructural properties, SEM, XRD, density, microhardness and corrosion behaviour of pre-alloyed NiTi alloys produced by two different methods with the production method was investigated. Findings As a result of the studies, TiO, NiTi, NiTi2 and Ni3Ti intermetallics were determined in XRD examinations. The best surface roughness was observed in the mechanically milled (MM’ed) pre-alloyed NiTi alloy compared to the pre-alloyed NiTi alloy mixed with turbula. The corrosion tests performed in 3.5% NaCl solution determined that the MM’ed pre-alloyed NiTi alloy had better corrosion resistance than the pre-alloyed NiTi alloy mixed with turbula. Pitting corrosion was visualized in the SEM images taken from the corrosion surfaces. Originality/value Two different PM methods produced pre-alloyed NiTi powders, and the effects of these methods on the mechanical and corrosion resistance of NiTi alloys were systematically investigated for the first time.

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“…Hence, a wide range of microstructures and mechanical properties can be obtained to customize applications 7 . TC21 is thought to be a strong competitor and replacement for the well-known Ti-alloy Ti-6Al-4V (Ti64) 8 . Some call Ti64 a workhorse titanium industry alloy, it dominates 50% of the global market 6 .…”

Section: Modeling Of Wear Resistance For Tc21 Ti-alloy Using Response...mentioning

confidence: 99%

Modeling of wear resistance for TC21 Ti-alloy using response surface methodology

Abdelmoneim

Elshaer

El-Shennawy

et al. 2023

Sci Rep

Self Cite

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This study investigated the effect of heat treatment processes on the dry sliding wear resistance of the TC21 Ti-alloy at several levels of normal load and sliding speed. Response Surface Methodology (RSM) has been used as a design of the experiment procedure. OM and FESEM besides XRD analysis were used for results justification. Highest hardness of 49 HRC was recorded for WQ + Aging specimens due to the plenty of α″ which decomposed to αs and the more αs, while the lowest hardness of 36 HRC was reported for WQ specimens. The results revealed that specimens subjected to water quenching and aging (WQ + Aging) under extreme load and speed conditions (50 N and 3 m/s), possessed the poorest wear resistance although they had the highest hardness. While those left in the annealed condition revealed the highest wear resistance although they had much lower hardness when compared to other conditions. A mathematical polynomial model for wear resistance expressed in wear rate was developed, validated then used to get the optimum parameters.

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Study of Microstructure, Mechanical Properties, and Corrosion Behavior of As-Cast Ni-Ti and Ti-6Al-4V Alloys

Cited by 16 publications

References 50 publications

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Influence of intermetallic phase (TiFe) on the microstructural evolution and mechanical properties of as-cast and quenched Ti–Mo–Fe alloys

Influence of technological synthesis conditions on corrosion behaviour and mechanical properties for NiTi alloys

Modeling of wear resistance for TC21 Ti-alloy using response surface methodology

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