High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

Preisler, Dalibor; Stráský, Josef; Harcuba, Petr; Warchomicka, Fernando; Janeček, Miloš

doi:10.12693/aphyspola.134.636

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…As-cast Ti-35.3Nb-7.3Zr-5.7Ta-0.7O (TNZTO) alloy contains very large grains with the size ranging from 0.5 to 3 mm. Despite that, the alloy shows promising properties under static loading [22]. On the other hand, fatigue performance of the as-cast material is rather poor, as shown below.…”

Section: Introductionmentioning

confidence: 97%

“…The most important difference between above mentioned alloys and the studied TNZTO alloy is that the TNZTO alloy is much stronger at elevated temperatures, which can be attributed to the strengthening by oxygen. For instance, at the temperature of 800 • C and the strain rate of 0.01 s −1 , the Ti-5553 alloy deforms already at the stress of approximately 80 MPa [29], while stress of 250 MPa is required for the deformation of TNZTO alloy at these conditions [33].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

et al. 2019

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Beta titanium alloy Ti-35Nb-6Ta-7Zr-0.7O (wt%) was developed as a material intended for the manufacturing of a stem of a hip joint replacement. This alloy contains only biocompatible elements and possesses a very high yield strength already in the cast condition (900 MPa). However, the porosity, large grain size and chemical inhomogeneity reduce the fatigue performance below the limits required for utilization in the desired application. Two methods of hot working, die forging and hot rolling, were used for processing of this alloy. Microstructural evolution, tensile properties and fatigue performance of the hot worked material were investigated and compared to the cast material. Microstructural observations revealed that porosity is removed in all hot-worked conditions and the grain size is significantly reduced when the area reduction exceeds 70%. Static tensile properties were improved by both processing methods and ultimate tensile strength (UTS) of 1200 MPa was achieved. Fatigue results were more reproducible in the hot rolled material due to better microstructural homogeneity, but forging leads to an improved fatigue performance. Fatigue limit of 400 MPa was achieved in the die-forged condition after 70% of area reduction and in the hot rolled condition after 86% of area reduction.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

et al. 2019

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“…%). Initial as-cast material contains very large grains with size of 0.5 to 3 mm [5,12] and this leads to reduced strength and poor fatigue resistance. The grains are to be refined by coldswaging and recrystallization annealing in a rather wide range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Cold Swaging and Recrystallization Annealing of Ti-Nb-Ta-Zr-O Alloy - Microstructure, Texture and Microhardness Evolution

Preisler

Stráský

Harcuba

et al. 2018

MSF

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Metastable β-Ti alloy Ti-35.3Nb-7.3Zr-5.7Ta-0.7O (wt. %) shows properties desirable for use as an implant material. However, very large grains (with the size of 0.5 – 3 mm) negatively affect the strength and fatigue resistance. Combination of cold-swaging and recrystallization annealing is used to refine the microstructure. Microstructure after cold swaging and after annealing is studied using scanning electron microscope by electron back-scatter diffraction measurements. Grain size and texture is determined and homogeneity of deformation inside the grains is discussed. Microhardness maps are measured in the cold-swaged samples. It is found that microhardness and thus also the deformation is higher in the center of each rod however the grains retain their original size. Annealing leads to recrystallization that is complete or nearly complete at the temperatures of 1000°C and more. Annealing at 1000°C for 15 min yields grain size of around 100 μm. This grain size is believed to increase the fatigue performance to satisfactory values.

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“…In comparison, coarse grained Ti-12Mo after two step ageing containing both β and α-phase possess yield strength of 1000 MPa [39]. Moreover, severely deformed metastable β-alloy TNTZO containing no α-phase had comparable yield strength over 1100 MPa [40]. Figure 11.…”

Section: Spark Plasma Sinteringmentioning

confidence: 98%

Mechanical Properties of Ti-15Mo Alloy Prepared by Cryogenic Milling and Spark Plasma Sintering

Veverková

Kozlík

Bartha

et al. 2019

Metals

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Metastable β-Ti alloy Ti-15Mo was prepared by cryogenic ball milling in a slurry of liquid argon. Material remained ductile even at low temperatures, which suppressed particle refinement, but promoted intensive plastic deformation of individual powder particles. Repetitive deformation of powder particles is similar to the multidirectional rolling and resembles bulk severe plastic deformation (SPD) methods. Initial and milled powders were compacted by spark plasma sintering. Sintered milled powder exhibited a refined microstructure with small β-grains and submicrometer sized α-phase precipitates. The microhardness and the yield tensile strength of the milled powder after sintering at 850 °C attained 350 HV and 1200 MPa, respectively. Low ductility of the material can be attributed to high oxygen content originating from the cryogenic milling. This pioneering work shows that cryogenic milling followed by spark plasma sintering is able to produce two-phase β-Ti alloys with refined microstructure and very high strength levels.

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High Temperature Mechanical Properties and Microstructure of Ti-Nb-Zr-Ta-O Biomedical Alloy

Cited by 5 publications

References 15 publications

The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

The Effect of Hot Working on the Mechanical Properties of High Strength Biomedical Ti-Nb-Ta-Zr-O Alloy

Cold Swaging and Recrystallization Annealing of Ti-Nb-Ta-Zr-O Alloy - Microstructure, Texture and Microhardness Evolution

Mechanical Properties of Ti-15Mo Alloy Prepared by Cryogenic Milling and Spark Plasma Sintering

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