Microstructure and tensile properties of hot-rolled Zr50–Ti50 binary alloy

Zhou, Yulin; Liang, S.X.; Jing, Ran; Jiang, Xiaoxiang; Ma, Mingzhen; Tan, Chen; Liu, R.P.

doi:10.1016/j.msea.2014.10.079

Cited by 45 publications

(4 citation statements)

References 24 publications

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“…Similar twinning microstructure also appears along with the bcc→hcp martensitic transformation [60]. These transformation twins are also found in water quenched Ti-50Zr (at.%) alloy [61]. Another interesting aspect is related to the relatively high ductility of Al 10 Hf 25 Nb 5 Sc 10 Ti 25 Zr 25 alloy.…”

Section: Tablesupporting

confidence: 55%

Deformation induced twinning in hcp/bcc Al10Hf25Nb5Sc10Ti25Zr25 high entropy alloy – microstructure and mechanical properties

Rogal

Wdowik

Szczerba

et al. 2021

Materials Science and Engineering: A

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High-entropy alloys of hexagonal structure commonly revealing high strength but very limited ductility, still remain a challenging task. Advanced strategy is proposed in present work in order to develop high-entropy alloy of chemical composition Al 10 Hf 25 Nb 5 Sc 10 Ti 25 Zr 25 at.%. Crystallographic features and microstructures of as-cast and annealed Al 10 Hf 25 Nb 5 Sc 10 Ti 25 Zr 25 at.% alloy are characterized by X-ray diffraction, scanning and highresolution transmission electron microscopies, whereas differential scanning calorimetry is used to follow temperature-induced phase transformation in the as-cast system. The cast alloy reveals microstructure containing fine orthorhombic needle-like plates within solid-solution of body-centered cubic structure. Such a dual-phase microstructure leads to enhanced combination of high strength and good ductility. The alloy annealed at 1000 • C for 5h acquires tensile strength increased by 38%, yield strength more than ten times higher, and almost 3-fold increased plasticity as compared with the as-cast alloy. Its Vickers hardness becomes higher by 25%. These meaningful changes are associated with temperature-induced transformation of its microstructure, which include diffusion growth of hexagonal plates enriched in Zr, Sc, and Hf within the bcc-type matrix enriched in Nb and Ti. Microstructure reveals twins within the hcp plates which plays a crucial role in plastic deformation and strengthening of the materials. Ab initio calculations based on the density functional theory are employed to investigate stability and mechanical properties of bcc, hcp, and orthorhombic phases of 5-component Al 15 Hf 25 Sc 10 Ti 25 Zr 25 at.% and 6-component Al 10 Hf 25 Nb 5 Sc 10 Ti 25 Zr 25 at.% high entropy alloys. The hcp phases of both systems are energetically preferred at T = 0 K, brittle and have rather high Vickers hardness. The bcc phases of both high-entropy alloys stabilize and become energetically favored above 790 K for Al 15 Hf 25 Sc 10-Ti 25 Zr 25 at.% and 1150 K for Al 10 Hf 25 Nb 5 Sc 10 Ti 25 Zr 25 at.% alloys. Depending on the type of crystallographic structure, the phases enriched in 5 at% of Nb show either reduced or enhanced values of their elastic moduli and Vickers hardness as compared to the Nb-free phases. No transformation from brittle to ductile state and vice versa is observed upon doping the considered phases of Al-Hf-Sc-Ti-Zr system with Nb.

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Section: Tablesupporting

confidence: 55%

Deformation induced twinning in hcp/bcc Al10Hf25Nb5Sc10Ti25Zr25 high entropy alloy – microstructure and mechanical properties

Rogal

Wdowik

Szczerba

et al. 2021

Materials Science and Engineering: A

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“…Although some binary Ti-Zr alloys -with Ti as the main component-have been adopted in the last decade for dental clinical applications [12,13], the same has not happened with binary Zr-Ti alloys, where Zr is the main component. Nonetheless, several studies correlated composition and structure with mechanical properties [14][15][16], and other works reported interesting corrosion resistance properties [17][18][19][20][21][22]. To date, the optimal ratio between Ti and Zr is still under investigation in order to combine mechanical properties similar to the host tissue where it will be implanted, a greater resistance against corrosion in the physiological environment, and good biological activity [23].…”

Section: Introductionmentioning

confidence: 99%

Improvement of the Corrosion Resistance of Biomedical Zr-Ti Alloys Using a Thermal Oxidation Treatment

Izquierdo

Mareci

Bolat

et al. 2020

Metals

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Binary Zr-Ti alloys spontaneously develop a tenacious and compact oxide layer when their fresh surface is exposed either to air or to aqueous environments. Electrochemical impedance spectroscopy (EIS) analysis of Zr-45Ti, Zr-25Ti, and Zr-5Ti exposed to simulated physiological solutions at 37 °C evidences the formation of a non-sealing bilayer oxide film that accounts for the corrosion resistance of the materials. Unfortunately, these oxide layers may undergo breakdown and stable pitting corrosion regimes at anodic potentials within the range of those experienced in the human body under stress and surgical conditions. Improved corrosion resistance has been achieved by prior treatment of these alloys using thermal oxidation in air. EIS was employed to measure the corrosion resistance of the Zr-Ti alloys in simulated physiological solutions of a wide pH range (namely 3 ≤ pH ≤ 8) at 37 °C, and the best results were obtained for the alloys pre-treated at 500 °C. The formation of the passivating oxide layers in simulated physiological solution was monitored in situ using scanning electrochemical microscopy (SECM), finding a transition from an electrochemically active surface, characteristic of the bare metal, to the heterogeneous formation of oxide layers behaving as insulating surfaces towards electron transfer reactions.

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“…In the last decade, several studies have reported on the potential application of ZrTi alloys as implant biomaterials due to their improved mechanical characteristics related to the amalgam's composition and structure [1][2][3][4], whereas other studies described their high corrosion resistance conferred by the combined effect of TiO 2 and ZrO 2 that jointly form the protective passive layers [5][6][7][8][9][10][11][12][13][14][15][16][17]. In contrast, only very few studies have attempted to characterize their biological activity either in vitro [18,19] or in vivo [20].…”

Section: Introductionmentioning

confidence: 99%

Osseointegration evaluation of ZrTi alloys with hydroxyapatite-zirconia-silver layer in pig's tibiae

Trincă

Mareci

Lozano-Gorrı́n

et al. 2019

Applied Surface Science

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In this work we studied the main surface characteristics together with the in vivo osseointegration of three Zr-Ti alloys with hydroxyapatite-zirconia-silver (HAP-ZrO 2 -Ag) coating layer. The main purpose was to provide a quantitative evaluation and interpretation from micro to nano scale of the processes involved in the osseointegration of the HAP-ZrO 2 -Ag coated Zr-Ti specimens in a pig model. The surface characteristics were studied by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD). After the insertion of the implants into pig tibia, the osseointegration was investigated by means of biochemical analysis as well as bone histomorphometric and computed tomography measurements. The results of this in vivo study sustains that the capacity of the Zr-Ti specimens coated with HAP-ZrO 2 -Ag to promote osteogenesis is significant during the first month after implantation as compared with the control, being influenced by the interactions between bone tissue and HAP-ZrO 2 -Ag surfaces, but also by the chemical composition of the alloys.

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Microstructure and tensile properties of hot-rolled Zr50–Ti50 binary alloy

Cited by 45 publications

References 24 publications

Deformation induced twinning in hcp/bcc Al10Hf25Nb5Sc10Ti25Zr25 high entropy alloy – microstructure and mechanical properties

Deformation induced twinning in hcp/bcc Al10Hf25Nb5Sc10Ti25Zr25 high entropy alloy – microstructure and mechanical properties

Improvement of the Corrosion Resistance of Biomedical Zr-Ti Alloys Using a Thermal Oxidation Treatment

Osseointegration evaluation of ZrTi alloys with hydroxyapatite-zirconia-silver layer in pig's tibiae

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