Formation and characterization of Al–Ti–Nb alloys by electron-beam surface alloying

Valkov, Stefan; Petrov, P.; Lazarova, R.; Bezdushnyi, R.; Дечев, Д.

doi:10.1016/j.apsusc.2016.07.170

Cited by 29 publications

(15 citation statements)

References 28 publications

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“…Ti-Al intermetallic phases have excellent mechanical properties and good oxidation resistance up to 700°C. [1][2][3][4][5][6][7][8] The alloying element Nb is used to enhance their oxidation resistance, hot formability and creep resistance. [9][10][11][12] The ternary Ti-Al-Nb system also contains many intermetallics which have a potential for producing alloys with various mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Phase Equilibria of the Ti-Al-Nb System at 1000, 1100 and 1150 °C

Liu

Zhang

et al. 2018

J. Phase Equilib. Diffus.

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1000, 1100 and 1150°C isothermal sections of the Ti-Al-Nb system were studied using x-ray diffraction, scanning electron microscopy and electron probe microanalysis. A small island-like region of single b 0 is present at 1000, but absent at 1100 and 1150°C. c 1 is not a stable phase at 1000 and 1150°C. Three three-phase fields (a 2 ? b 0 ? r, b 0 ? r ? c and a 2 ? b 0 ? c) are identified in the 1000°C isothermal section (30-60 at.% Ti content). The 1100°C isothermal section is firstly studied completely. It includes six three-phase and thirteen two-phase fields. Two three-phase fields b ? a 2 ? c and b ? r ? c are identified in the isothermal section (30-60 at.% Ti content) at 1150°C. These data are helpful to the fabrication of the TiAl and Ti 2 AlNb intermetallics. Keywords intermetallics Á microstructure Á phase diagram Á TiAl alloy Dedicate to the celebration of Prof. Zhanpeng Jin's 80th birthday. This invited article is part of a special issue of the Journal of Phase Equilibria and Diffusion in honor of Prof. Zhanpeng Jin's 80th birthday. The special issue was organized by Prof. Ji-Cheng (JC) Zhao,

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Section: Introductionmentioning

confidence: 99%

Phase Equilibria of the Ti-Al-Nb System at 1000, 1100 and 1150 °C

Liu

Zhang

et al. 2018

J. Phase Equilib. Diffus.

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“…The reported microhardness changes from 480 to 650 HV with varying of the scanning speed from 5 to 40 mm/sec. Valkov et al [47] have studied an alloying of pure aluminum with as-deposited Ti-Nb coatings by means of a scanning electron beam, and their results show that undissolved particles have not been observed after the alloying process, contrary to the case of laser beam alloying. The alloyed zone consists of (Ti,Nb)Al 3 intermetallic fractions randomly distributed in the biphasic structure of fine (Ti,Nb)Al 3 particles dispersed in the Al matrix.…”

Section: Hardeningmentioning

confidence: 99%

Surface Manufacturing of Materials by High Energy Fluxes

Valkov¹,

Ormanova²,

Petrov³

2018

Advanced Surface Engineering Research

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This chapter aims to summarize the topics related to the application of a surface treatment by high energy fluxes (i.e., electron and laser beams) for developing of new multifunctional materials, as well as to modify their surface properties. These technologies have a large number of applications in the field of automotive and aircraft industries for manufacturing of railways, space crafts, different tools, and components. Based on the performed literature review, some examples of the use of laser and electron beams for surface manufacturing (i.e., surface alloying, cladding, and hardening) are presented. The present overview describes the relationship between electron beam and laser beam technologies, microstructure, and the obtained functional properties of the materials. The benefits of the considered techniques are extensively discussed.

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“…However, large residual stress of workpiece still resulted from rapid cooling and solidification limiting its application [16,17]. It is necessary to eliminate residual stress and further refine the microstructures to improve the mechanical properties of titanium alloy parts [18,19].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Heat Treatment Temperature on Microstructures and Mechanical Properties of Titanium Alloy Fabricated by Laser Melting Deposition

Wang

et al. 2020

Materials

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Ti-6Al-4V (TC4) titanium alloy parts were successfully fabricated by laser melting deposition (LMD) technology in this study. Proper normalizing temperatures were presented in detailed for bulk LMD specimens. Optical microscope, scanning electron microscopy, X-ray diffraction, and electronic universal testing machine were used to characterize the microstructures, phase compositions, the tensile properties and hardness of the TC4 alloy parts treated using different normalizing temperature. The experimental results showed that the as-fabricated LMD specimens’ microstructures mainly consisted of α-Ti phase with a small amount of β-Ti phase. After normalizing treatment, in the area of α-Ti phase, the recrystallized length and width of α-Ti phase both increased. When normalizing in the (α + β) phase field, the elongated primary α-Ti phase in the as-deposited state was truncated due to the precipitation of β-Ti phase and became a short rod-like primary α-Ti phase. In as-fabricated microstructure, the β-Ti phase was precipitated between different short rod-shaped α-Ti phases distributed as basketweave. After normalizing treatment at 990 for two hours with subsequent air cooling, the TC4 titanium alloy had significant different microstructures from original sample produced by LMD. The normalizing treatment methods and temperature can be qualified as a prospective heat treatment of titanium alloy fabricating by laser melting deposition.

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Formation and characterization of Al–Ti–Nb alloys by electron-beam surface alloying

Cited by 29 publications

References 28 publications

Phase Equilibria of the Ti-Al-Nb System at 1000, 1100 and 1150 °C

Phase Equilibria of the Ti-Al-Nb System at 1000, 1100 and 1150 °C

Surface Manufacturing of Materials by High Energy Fluxes

The Influence of Heat Treatment Temperature on Microstructures and Mechanical Properties of Titanium Alloy Fabricated by Laser Melting Deposition

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