On the eutectoid transformation behavior of the Ti-Zn system and its metastable phases

Abstract

To date, Zn has not been used as an alloying addition in structural Ti alloys. The main obstacle has been the disparity between their melting and vaporization temperatures. A novel processing technique was developed to create a Ti-Zn compound. The equilibrium phases and microstructures were studied by electron microscopy and x-ray diffraction techniques. Results show the presence of pearlitic domains of α-Ti (hexagonal closed packed crystal structure) and Ti2Zn (body center tetragonal structure) in regions that have a near eutectoid composition. Solutionizing and water quenching results in the formation of martensite along with intermetallic laths, suggesting that the eutectoid transformation is active. Disciplines Materials Science and Engineering Comments

Study on microstructure and wear resistance of Zr-17Nb alloy irradiated by high current pulsed electron beam

“…Moreover, this transformation contributes to the improvement of antibacterial property in biomedicine. Brice et al [40] found that β-Ti decomposes into α-Ti phase and Ti 2 Zn phase through active eutectoid transformation in waterquenched Zn-17 wt.% Ti alloy. The aggregation state of the decomposition products is flaky, and a good pearlite structure can be obtained under rapid cooling conditions.…”

Gradient Microstructures and Mechanical Properties of Ti-6Al-4V/Zn Composite Prepared by Friction Stir Processing

“…In Figure 6b, Zn-rich particles with a grain size below 100 nm are also found. It was reported that α-Ti had a slightly larger solubility of the Zn element at Ti-rich side of the Ti–Zn phase diagram [24]. Therefore, it can be speculated that the added Zn can react with Ti to form Zn-rich particles or dissolve into the α matrix to form a solid solution during FSP.…”

“…Zn is an important element in the human body, due to its role in the synthesis of a variety of enzymes, improving bone growth, and maintaining cell physiological function [22,23]. However, there are significant differences between the melting point of Ti (1660 °C) and the boiling point of Zn (907 °C), and, thus, it is difficult to add Zn into a Ti alloy via conventional metallurgical processing [24,25]. Brice et al [24] successfully prepared Ti–Zn compound via a self-designed reaction chamber, and found that α-Ti has a much larger solubility than in the equilibrium phase diagram.…”

“…However, there are significant differences between the melting point of Ti (1660 °C) and the boiling point of Zn (907 °C), and, thus, it is difficult to add Zn into a Ti alloy via conventional metallurgical processing [24,25]. Brice et al [24] successfully prepared Ti–Zn compound via a self-designed reaction chamber, and found that α-Ti has a much larger solubility than in the equilibrium phase diagram. Vassilev et al [26] studied the reaction kinetics in the Ti–Zn system via the heat diffusion method.…”

Preparação de eletrodos com filmes contendo TiO2 e ZnO nanoestruturados a partir de um compósito de Ti e Zn para aplicações em processos fotoeletrocatalíticos

“…Brice et al (2017) citam que uso de Zn na metalurgia do Ti foi restrito a ambientes laboratoriais devido à disparidade entre o ponto de fusão do Ti (1660 ºC) e o ponto de fusão do Zn (420 ºC). Entretanto, para ligas ricas em Ti, altas taxa de resfriamento a partir de tratamento por bombardeio por feixe de elétrons e existência de formação martensítica perleitica competindo com formação eutetóide, estudos recentes sugerem formação de ligas Ti/Zn com porcentagem de zinco de 20%, pois a solubilidade do zinco em α-Ti é maior do que reportado porOkamoto (2008).3.5 Tratamento de fármacos por Processos Oxidativos Avançados (POA)Segundo Gros et al (2010), Uwai et al (2005) e Baranowska e Koper (2011), o propranolol (1-(isopropilamino)-3-(1-naftoxi)-2-propanol) apresenta peso molecular de 259,34 g/mol (Figura 2), é um beta-bloqueador largamente utilizado para o tratamento de angina, arritmia e hipertensão.…”