Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

Choi, Kyunsuk; Lee, Kwang Hee; Ali, Basit; Choi, Suna; Park, Kyoung Tae; Sohn, In Sook

doi:10.1007/s12540-017-7010-4

Cited by 6 publications

(6 citation statements)

References 20 publications

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“…These observations are due to the change in the covalence of the RE-O chemical bond in the glass matrix. It has been reported that the local atomic environments surrounding the RE atoms as well as the covalence character of the RE chemical bonds play an important role in the optical emission from RE doped glasses (Choi, 2006;Choi et al, 2007). In fact, the covalence of the RE-O chemical bond, the ratio O/Nd and the coordination number are correlated with changes in the structural properties of the glass.…”

Section: Resultsmentioning

confidence: 99%

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

Rajput

Jha

et al. 2016

J Synchrotron Radiat

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X-ray absorption near-edge structure (XANES) and X-ray photoelectron spectroscopy (XPS) of Nd-doped phosphate glasses have been studied before and after gamma irradiation. The intensity and the location of the white line peak of the L-edge XANES of Nd are found to be dependent on the ratio O/Nd in the glass matrix. Gamma irradiation changes the elemental concentration of atoms in the glass matrix, which affects the peak intensity of the white line due to changes in the covalence of the chemical bonds with Nd atoms in the glass (structural changes). Sharpening of the Nd 3d peak profile in XPS spectra indicates a deficiency of oxygen in the glasses after gamma irradiation, which is supported by energy-dispersive X-ray spectroscopy measurements. The ratio of non-bridging oxygen to total oxygen in the glass after gamma radiation has been found to be correlated to the concentration of defects in the glass samples, which are responsible for its radiation resistance as well as for its coloration.

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Section: Resultsmentioning

confidence: 99%

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

Rajput

Jha

et al. 2016

J Synchrotron Radiat

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“…TMP includes various processes, such as the homogenization of cast ingots, hot (HR)/cold rolling (CR), heating the alloys to different temperatures (above and below the β-transus temperature) followed by final CR deformation, and aging treatment [38]. It is well documented that phase stability in Ti alloys depends on their composition or alloy additions, since α-Ti consists of α-stabilizers (Al, N, O, Sn) and β-Ti consists of β-stabilizers (V, Nb, Cr, Fe, Mo) [39,40]. Based on the alloy's constituents, β-Ti alloys are further divided into near β, metastable β, and stable β-Ti alloys.…”

Section: Beta-ti Alloysmentioning

confidence: 99%

Evolution of Microstructure and Crystallographic Texture in Deformed and Annealed BCC Metals and Alloys: A Review

Tandon,

Park,

Khatirkar

et al. 2024

Metals

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Dislocation slips, twinning, shear banding (SBs), strain localization, and martensite formation are a few deformation modes that are activated in BCC metals and alloys. Strain, strain rate, and deformation temperature are other parameters that determine the activation of deformation modes in BCC alloys. This review focuses on several BCC alloys, such as beta-titanium (β-Ti), tantalum (Ta), and ferritic stainless steels (FSSs), all of which exhibit differences in deformation behavior. These alloys often undergo thermo-mechanical processing (TMP) to enhance their mechanical properties. TMP leads to the evolution of deformation-induced products, such as SBs, strain-induced martensite (SIM), strain localizations, and mechanical/deformation twins (DTs) during plastic deformation, while also influencing crystallographic texture. The deformation modes in β-Ti depend upon the stability of the β-phase (i.e., β-stabilizers); low-stability alloys show the formation of SIM along with slips and twins, whereas in highly stable β-Ti alloys, only slip+twin modes are observed as the primary deformation mechanisms. In the case of Ta, slip activity predominantly occurs on {110} planes, but it can also occur on planes with the highest resolved shear stress. The breakdown of Schmid’s law or non-Schmid behavior for Ta and Ta-W alloys has been discussed in detail. The cold rolling (CR) of FSSs results in the formation of ridges, which is an undesirable phenomenon leading to very low formability. The microstructures of the rolled sheets consist of elongated ferrite grains with in-grain SBs, which are preferentially formed in the γ-fiber-oriented grains. The formation of finer grains after recrystallization improves both the mechanical properties and ridging resistance in FSS. Therefore, this review comprehensively reports on the impact of TMP on the microstructural and crystallographic texture evolution during the plastic deformation and annealing treatment of β-Ti, Ta alloys, and FSSs in BCC materials, using results obtained from electron microscopy and X-ray diffraction.

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“…These textures are in the constant cross-section of φ 2 = 45°in the Euler orientation space; hence, the characteristics of various textures are easiest to observe from the φ 2 = 45°section. [38][39][40] To study the texture alterations of the Ti-B20 alloy during cold rolling, the ODF is calculated and plotted using the polar graph data obtained by XRD analysis. Figure 8 shows the φ 2 = 45°s ections of ODFs obtained from the ST and CR specimens, and Figure 8f shows a schematic drawing of the φ 2 = 45°s ections of ODFs with typical texture components for BCC materials.…”

Section: Texture Evolution Of the Ti-b20 Alloy During Cold Rollingmentioning

confidence: 99%

Microstructure, Texture Evolution, and Aging Behavior of a Cold‐Rolled Ti–B20 Alloy

Xiang

Tan

et al. 2023

Adv Eng Mater

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The microstructure, texture evolution, and aging behavior of a cold‐rolled (CR) Ti–B20 alloy are investigated in this work. The results show that the microstructure of the solution‐treated (ST) Ti–B20 alloy consists of equiaxed recrystallized grains and exhibits typical {001}<110> and {001}<100> textures. After cold rolling, the initial equiaxial grains are stretched along the rolling direction (RD), which can produce typical deformation textures of γ‐fiber {111}<112> and {111}<110> textures. For the CR samples after aging treatment, small amounts of needle‐like or spherical α‐phases preferentially precipitate in the grain boundaries of deformed β grains during aging treatment; many nanosized α‐phases uniformly precipitate in the grain boundaries and inside the β grains. A high dislocation density is generated in CR samples, promoting α‐phase nucleation, increasing the volume fraction, and decreasing the α‐phase size during aging treatment.

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Magnesiothermic reduction for direct synthesis of Ti-Nb alloy at 1073 K (800 °C)

Cited by 6 publications

References 20 publications

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

Effect of gamma irradiation on X-ray absorption and photoelectron spectroscopy of Nd-doped phosphate glass

Evolution of Microstructure and Crystallographic Texture in Deformed and Annealed BCC Metals and Alloys: A Review

Microstructure, Texture Evolution, and Aging Behavior of a Cold‐Rolled Ti–B20 Alloy

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