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Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy.
Micron. 2019 Jun; 121:43-52.M

Abstract

Electron diffraction effect associated with nano-scale periodic modulations observed in a quenched Ti-15 wt%Mo alloy within ω phase forming regime has been investigated in this study by analyzing selected area diffraction patterns and high-resolution phase contrast images. Crystallographic direction of the side bands in electron diffraction associated with the periodic modulation of wavelength 1.3 nm is established as [001]β which is an elastically soft direction for the body-centered cubic lattice. Characteristics of the side bands in the diffraction patterns, such as the correlation of spacing of satellite spots with real-space modulation wavelength and the constancy in the direction of satellites and modulations are interpreted as the proof of phase separation by spinodal decomposition. The striations associated with spinodal decomposition form only in Mo-enriched regions of dimensions ˜ 20 nm distributed throughout the β matrix. Accordingly, in this study, two varieties of compositional modulations that appear in the matrix are experimentally illustrated: (1) Mo-depleted and Mo-enriched domains of 10-20 nm size, and (2) The anisotropic compositional modulation by spinodal decomposition in [001]β direction with a modulation wavelength of 1.3 nm occurring in Mo-enriched pockets. It is confirmed that the structural modulations and ω phase formation occurs only in the regions without striations (Mo-lean regions). By analyzing the diffraction spots, it is also shown that the ω phase does not undergo any phase separation by spinodal decomposition.

Authors+Show Affiliations

Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, 603 102, Kalpakkam, India. Electronic address: alphy@igcar.gov.in.Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, HBNI, 603 102, Kalpakkam, India.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

30939359

Citation

George, Alphy, and Divakar R. "Evidence for Spinodal Decomposition in Ti-15Mo Quenched Alloy Using Transmission Electron Microscopy." Micron (Oxford, England : 1993), vol. 121, 2019, pp. 43-52.
George A, R D. Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy. Micron. 2019;121:43-52.
George, A., & R, D. (2019). Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy. Micron (Oxford, England : 1993), 121, 43-52. https://doi.org/10.1016/j.micron.2019.03.003
George A, R D. Evidence for Spinodal Decomposition in Ti-15Mo Quenched Alloy Using Transmission Electron Microscopy. Micron. 2019;121:43-52. PubMed PMID: 30939359.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evidence for spinodal decomposition in Ti-15Mo quenched alloy using transmission electron microscopy. AU - George,Alphy, AU - R,Divakar, Y1 - 2019/03/22/ PY - 2018/06/19/received PY - 2019/03/21/revised PY - 2019/03/21/accepted PY - 2019/4/3/pubmed PY - 2019/4/3/medline PY - 2019/4/3/entrez KW - Nano-instabilities KW - Phase separation KW - Satellite spots KW - Spinodal decomposition KW - Ti-Mo alloy KW - ω phase SP - 43 EP - 52 JF - Micron (Oxford, England : 1993) JO - Micron VL - 121 N2 - Electron diffraction effect associated with nano-scale periodic modulations observed in a quenched Ti-15 wt%Mo alloy within ω phase forming regime has been investigated in this study by analyzing selected area diffraction patterns and high-resolution phase contrast images. Crystallographic direction of the side bands in electron diffraction associated with the periodic modulation of wavelength 1.3 nm is established as [001]β which is an elastically soft direction for the body-centered cubic lattice. Characteristics of the side bands in the diffraction patterns, such as the correlation of spacing of satellite spots with real-space modulation wavelength and the constancy in the direction of satellites and modulations are interpreted as the proof of phase separation by spinodal decomposition. The striations associated with spinodal decomposition form only in Mo-enriched regions of dimensions ˜ 20 nm distributed throughout the β matrix. Accordingly, in this study, two varieties of compositional modulations that appear in the matrix are experimentally illustrated: (1) Mo-depleted and Mo-enriched domains of 10-20 nm size, and (2) The anisotropic compositional modulation by spinodal decomposition in [001]β direction with a modulation wavelength of 1.3 nm occurring in Mo-enriched pockets. It is confirmed that the structural modulations and ω phase formation occurs only in the regions without striations (Mo-lean regions). By analyzing the diffraction spots, it is also shown that the ω phase does not undergo any phase separation by spinodal decomposition. SN - 1878-4291 UR - https://www.unboundmedicine.com/medline/citation/30939359/Evidence_for_spinodal_decomposition_in_Ti-15Mo_quenched_alloy_using_transmission_electron_microscopy L2 - https://linkinghub.elsevier.com/retrieve/pii/S0968-4328(18)30248-8 DB - PRIME DP - Unbound Medicine ER -
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