Heterogeneous twin formation and its effect on tensile properties in Ti–Mo based β titanium alloys

Min, Xiaohua; Tsuzaki, Kaneaki; Emura, Satoshi; Tsuchiya, Koichi

doi:10.1016/j.msea.2012.06.009

Cited by 53 publications

(31 citation statements)

References 24 publications

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“…In addition, the observation reveals band-like structures, parallel to the horizontal direction in the figure. These are due to the solidification segregation of Mo element as reported by Min et al 19) An optical micrograph on the cross-section of Ti 15Mo alloy subjected to HPT for 1 turn is shown as Fig. 1(b).…”

Section: Resultssupporting

confidence: 51%

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

et al. 2014

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Precipitation behavior of ¡ phase in Ti15Mo alloy during isothermal aging after straining by high-pressure torsion (HPT) was investigated and compared with that without HPT process. Upon isothermal aging, ultrafine equiaxed ¡ phase particles and acicular ¡ phase plates were obtained in HPT-processed samples, while only the coarse acicular ¡ phase plates were obtained in the samples without HPT process. The precipitation of equiaxed ¡ phase occurred faster than the precipitation of acicular ¡ phase in HPT-processed samples. It seemed that a high density of dislocations resulted in highly strained area and enhanced atomic diffusivity, promoting the formation of equiaxed ¡ phase. The HPTprocessed samples exhibited higher hardness and ultimate tensile strength but lower ductility than those of the specimens without HPT process.

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Section: Resultssupporting

confidence: 51%

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

et al. 2014

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“…Titanium and its alloys are widely used in aerospace, chemical, and biomedical industries because of high specific strength and excellent corrosion resistance, especially for their applications in aero-engines [1][2][3]. However, conventional titanium alloys can be ignited and burned, known as "titanium fire," under specific conditions of high temperature, high pressure, and high-speed airflow, which limits their application for advanced aero-engines [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

High Temperature Oxidation and Wear Behaviors of Ti–V–Cr Fireproof Titanium Alloy

Yao

Bai

et al. 2017

Metals

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Abstract:The high temperature oxidation and wear behaviors of Ti-35V-15Cr-0.3Si-0.1C fireproof titanium alloy were examined at 873 and 1073 K. The oxidation weight gain after oxidation at 1073 K for 100 h was significantly larger than that at 873 K. Based on the analyses of the oxidation reaction index and oxide layer, the oxidation process at 1073 K was mainly controlled by oxidation reaction at the interface between the substrate and oxide layer. Dry sliding wear tests were performed on a pin-on-disk tester in air conditions. The friction coefficient was smaller at 1073 K than that at 873 K, while the volume wear rate at 1073 K was larger due to formation of amount of oxides on the worn surface. When the wearing temperature increased from 873 to 1073 K, the wear mechanism underwent a transition from a combination of abrasive wear and oxidative wear to only oxidative wear.

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“…However, the yield stress for the Ti-Nb-Zr-Mo-Sn alloy at 573K is higher than that at 293K. The higher yield stress can be related to the more dominant role played by dislocation slip [302]. The significant reduction in the yield stress at 873K is attributed to the cessation of mechanical twinning and to the strong thermal softening effects at the elevated temperatures.…”

Section: Yield Behaviourmentioning

confidence: 92%

“…The Ti-15Mo-5Zr alloy [75,76] and Ti-10Mo-2Fe alloy [76] are also designed to combine {332}<113> mechanical twinning and dislocation slip together to achieve large uniform elongation and high yield strength. …”

Section: Design Strategy For β Titanium Alloysmentioning

confidence: 99%

“…It is observed that when β titanium alloys are designed to be located within a specific zone in the Bo-Md diagram (Fig.3), different deformation modes including stress-induced martensitic transformation, various types of twinning and/or dislocations slip will be activated simultaneously and their interactions significantly contribute to enhanced strain hardening and Hongyi Zhan 15 The University of Queensland improved ductility [73,74]. The Ti-15Mo-5Zr alloy [75,76] and Ti-10Mo-2Fe alloy [76] are also designed to combine {332}<113> mechanical twinning and dislocation slip together to achieve large uniform elongation and high yield strength. …”

Section: Design Strategy For β Titanium Alloysmentioning

confidence: 99%

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The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

Zhan¹

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Titanium and its alloys fulfil a wide range of applications involving aerospace, biomedical, chemical and petroleum industries due to their extraordinary properties such as high specific strength, excellent biocompatibility and corrosion resistance. Among different types of titanium alloys, β titanium alloys have a unique range of properties such as an excellent combination of high strength and fracture toughness and low Young's modulus. Therefore, the usage of β titanium alloys in the manufacturing of some key components in aerospace and biomedical industries has continually increased in the past decade.Nowadays many commercial manufacturing processes for metallic materials such as machining, explosive welding, hot forging and extrusion employ high strain rates and are conducted at elevated temperatures. Also, high-strain-rate deformation can be encountered in collisions such as in car crashes, bird strikes on airplanes and micrometeorite impacts on space structures. Hence a large number of studies have been conducted on the dynamic response of metallic materials including copper, steels, tantalum, Ti-6Al-4V alloy and commercially pure titanium to high strain rates. Due to limited knowledge of the dynamic behaviour of β titanium alloys, this thesis mainly investigates the stress-strain behaviour and microstructural evolution of β titanium alloys under high strain rates at room and elevated temperatures.Split Hopkinson Pressure Bar compressive tests were carried out on two new types of β titanium alloys with different levels of β phase stability, the Ti-6Cr-5Mo-5V-4Al (wt. %) and Ti-25Nb-3Zr-3Mo-2Sn (wt.%) alloys, at strain rates ranging from 10 -3 s -1 to 10 4 s -1 and temperatures ranging from 293K to 1173K. The Ti-6Cr-5Mo-5V-4Al alloy, with relatively high β phase stability, represents an alloy type which can be engineered through heat treatment or thermo-mechanical processing to achieve a superior combination of strength and fracture toughness. While the Ti-25Nb-3Zr-3Mo-2Sn alloy with relatively low β phase stability represents an alloy type which can be applied in biomedical applications due to their low Young's modulus and superelastic properties.For the Ti-6Cr-5Mo-5V-4Al alloy, dislocation slip is dominant at all testing strain rates and temperatures in this research. The flow stress increases with increasing strain rate but decreasing temperature. Also, it is more sensitive to temperature than strain rate. At ambient temperatures, the strain hardening rate exhibited by the Ti-6Cr-5Mo-5V-4Al alloy at high strain rates is much lower than that at quasi-static strain rates, which is attributed to the thermal softening effect brought byHongyi Zhan II The University of Queensland adiabatic heating. While for the Ti-25Nb-3Zr-3Mo-2Sn alloy, multiple deformation mechanisms including dislocation slip, {332} <113> and {112} <111> mechanical twinning, stress-induced martensitic α" and ω phase transformations can be activated simultaneously and among them {332} <113> twinning is dominant at 293K regardless of...

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Heterogeneous twin formation and its effect on tensile properties in Ti–Mo based β titanium alloys

Cited by 53 publications

References 24 publications

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

High Temperature Oxidation and Wear Behaviors of Ti–V–Cr Fireproof Titanium Alloy

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

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Heterogeneous twin formation and its effect on tensile properties in Ti–Mo based β titanium alloys

Cited by 53 publications

References 24 publications

Effect of High-Pressure Torsion Process on Precipitation Behavior of &alpha; Phase in &beta;-Type Ti&ndash;15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of &alpha; Phase in &beta;-Type Ti&ndash;15Mo Alloy

High Temperature Oxidation and Wear Behaviors of Ti–V–Cr Fireproof Titanium Alloy

The dynamic response of β titanium alloys to high strain rates at room and elevated temperatures

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Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy