The crystallographic relationship of molybdenum textures after hot rolling and recrystallization

Лобанов, М. Л.; Данилов, С. В.; Пастухов, В. И.; Averin, S. A.; Khrunyk, Y.Y.; Попов, А. А.

doi:10.1016/j.matdes.2016.06.103

Cited by 45 publications

(14 citation statements)

References 16 publications

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“…С точки зрения моделей конденсированного состояния, полагающих стыковку зерен в поликристаллах только в виде специальных границ [20], предполагается, что во всех анализируемых состояниях области с кристаллической решеткой (кластеры, нанокристаллы или зерна) ограничены стабильными (малоподвижными) специальными границами двух типов: близких к границам РСУ Σ3 и Σ11 [21].…”

Section: результаты и обсуждениеunclassified

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Nikul’chenkov¹,

Yurovskikh²,

Starodubtsev³

et al. 2019

LOM

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The material for investigation was a ribbon with an amorphous structure obtained by the melt spinning technique from a melt of molybdenum-modified Finemet-type high-permeability Fe 72.5 Cu 1 Nb 2 Mo 1.5 Si 14 B 9 alloy. Using the methods of non-ambient X-ray diffraction, calorimetry, and dilatometry, temperature intervals of transformations during the transition of material from the amorphous state to the nanocrystalline one with subsequent recrystallization were determined. Each method was characterized by its own heating rate: 1 K / min for the non-ambient X-ray diffraction, 30 K / min for calorimetry, and 20 K / min for dilatometry. Regardless of the heating rate, phase and structure transformations (crystallization and recrystallization, respectively) were observed sequentially. With decreasing heating rate, the crystallization temperature significantly decreased and the recrystallization temperature slightly decreased. Specific heats of crystallization (386 kJ / mol) and recrystallization (88 kJ / mol) were calculated from calorimetry data. Basing on the results of X-ray diffraction and calorimetric studies, the possibility of using the structural unit model was analyzed to describe the amorphous state. It was supposed that any condensed state of the material (amorphous, nanocrystalline and recrystallized) were distinguished by different sizes of coherent scattering regions (CSRs). The lower estimate of coherent scattering regions size was made from the X-ray diffraction halo width for the amorphous state and (110) diffraction line broadening for polycrystals. The Wigner-Seitz cell (truncated octahedron) containing one atom has been adopted as a structural unit. Specific heats of transformations were compared to the values of energies related to the transitions of atoms from CSR borders to lattice sites. Satisfactory applicability of the structural unit model for the description of the amorphous state was demonstrated.

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Section: результаты и обсуждениеunclassified

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Nikul’chenkov¹,

Yurovskikh²,

Starodubtsev³

et al. 2019

LOM

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“…Looking for shear texture, many authors studied the effect of various rolling techniques as symmetric, asymmetric, continuous, snake, and reversed rolling in different materials . Equal Channel Angular Extrusion (ECAE), is also a fundamentally shearing deformation process, used for developing characteristic textures on many metals and alloys …”

Section: Introductionmentioning

confidence: 99%

Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

et al. 2017

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No uniform rolling deformation produces shear strains that give rise to textural and microstructural heterogeneities in processed metals and alloys. In this work, the authors investigate Fe-30Mn-4Si shape memory alloy sheets rolled in different conditions at 600 C, in order to determine the process giving rise to the best structure and the strongest {100}<110> shear texture. This crystallographic orientation is the most favorable for the g ! e martensitic transformation, which provides the shape memory effect in these alloys. In the current conditions, the authors find that unidirectional rolling produces a shear texture in sheet's surface layers. The authors compare the texture and microstructure from this process to those obtained from reverse rolling and single-roller drive rolling.

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“…Essas fibras são normalmente observadas em materiais CCC laminados [55], [61], [74]. Não foram encontrados resultados de FDOC de ligas de U-Mo deformadas a quente na literatura.…”

Section: 3unclassified

“…Materiais CCC recristalizados normalmente apresentam fibra γ mais intensa [55], [74], [79]. Deste modo, pode-se concluir que o recozimento das ligas U7,4Mo e U9,5Mo formam textura cristalográfica comum em materiais CCC recristalizados.…”

Section: Evolução Da Recristalizaçãounclassified

“…As fibras são faixas de orientações definidas no espaço de Euler.A fibra α abrange as orientações com o eixo do cristal <110> paralelo à DL, ou seja, as orientações {hkl}<110>, que incluem as orientações {001}<110>, {112}<110> e {111}<110>. No espaço de Euler, a fibra α é encontrada entre os ângulos (φ1, Φ, φ2) = (0°, 0°, 45°) e (0°, 90°, 45°).Em materiais recristalizados, as principais alterações da textura em materiais CCC são o aumento da fibra γ e, em contrapartida, o enfraquecimento da fibra α[55].A Há poucos estudos publicados envolvendo texturas cristalográficas de ligas de urânio-γ no estado laminado. O trabalho de Lopes et al obteve resultados de macrotextura da liga de UZrNb laminada a frio [53].…”

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Texturas cristalográficas em ligas de urânio-molibdênio laminadas a quente e recozidas

Nielsen¹

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NIELSEN, Guilherme F. Crystallographic texture of hot rolled and annealed uranium-molybdenum alloys. 2021. 144 p. Tese (Doutorado em Tecnologia Nuclear) -Instituto de Pesquisas Energéticas e Nucleares -IPEN/CNEN/SP. São Paulo.The Uranium-molybdenum alloys are a good candidate to be used as monolithic nuclear fuel in research, test, and also small power energy nuclear reactors. Hot rolling and annealing processes have been used for the production of monolithic fuels. The fuel production processes can generate crystallographic texture, which can modify the isotropic properties. Based on this, this work studied the preferred crystallographic orientation in hot rolled and annealed U-Mo alloys. The U7.4Mo and U9.5Mo alloys were melted in a vacuum induction furnace and then homogenized, hot rolled, and annealed. The alloys were characterized by optical and electronic microscopies. The crystalline phases were identified by X-ray diffraction. The macrotexture was analyzed by x-ray diffractometry and the microtexture was characterized by EBSD. The as-cast and processed alloys have the gamma phase.The best homogenization condition achieved was 1000 °C for 5 hours. The homogenized treatment showed effective for microsegregation reduction and substantial grain size increase was not observed. The deformed uraniummolybdenum alloys presented α, γ e θ fibers. The intensity of these texture fibers changed with rolling reduction. It was noted that the nucleation of recrystallized grains occurred in preferred locations. Recrystallized grains have crystallographic texture. Upon annealing, it was possible to verify that the microstructure in the annealed samples varies according to the degree of deformation and the annealing time. The deformation generated coincidence site lattice (CSL) grain boundaries.The movement of these special boundaries was observed with annealing.

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The crystallographic relationship of molybdenum textures after hot rolling and recrystallization

Cited by 45 publications

References 16 publications

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Phase and structural transformations in a nanocrystalline alloy Fe72.5Cu1Nb2Mo1.5Si14B9

Is it Possible to Use Rolling Methods to Improve Textures on Fe–Mn–Si Shape Memory Alloys?

Texturas cristalográficas em ligas de urânio-molibdênio laminadas a quente e recozidas

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