Low temperature electron microscopy on the cubic-tetragonal transformation of V3Si

Onozuka, Takashi; Ohnishi, Norio; Hirabayashi, Makoto

doi:10.1007/bf02628360

Cited by 21 publications

(8 citation statements)

References 11 publications

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“…Observations of martensitic tweed [1,2,4] show the patterns to be constant with time and largely reproducible with temperature cycling. Diffusion might drive precursors in some systems as suggested by Khachaturyan [16] and Marais et al [21], where defects are known to be highly mobile, but we do not believe this to be generally the case in martensites.…”

Section: /((!>)-= [Arit-to)-^arl7](xy) -7]o]}(p^mentioning

confidence: 91%

“…First-order solid-solid displacive transformations are strikingly different; precursors are common for tens through hundreds of degrees away from the transitions. We study here the tweed pattern [l] observed in electron micrographs well above the transition temperature in the so-called medium and weak martensites, including the shape-memory alloys FePd [2] and NiAl [3], the superconducting ^-15's [4], and high-T^ Y-Ba-Cu-Co-O, and Y-Ba-Cu-Al-O [5,6]. The tweed appears as a characteristic cross-hatched pattern.…”

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confidence: 98%

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Spin-glass nature of tweed precursors in martensitic transformations

et al. 1991

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Many displacive solid-solid transformations, despite being first order, show pronounced precursor effects, such as the mesoscopic, micron-scale, "tweed'' pattern seen in shape-memory alloys. We model this tweed theoretically using a nonlinear, nonlocal elastic free energy, and argue that quenched concentration inhomogeneities drive the local tweed modulations. We report (1) the construction of a model for {l l}/(lT) shear transformations in square systems, (2) a simulation including concentration inhomogeneities, and (3) a mapping of the disordered 2D martensite onto an infinite-range spin model, identifying tweed with the spin-glass phase.PACS numbers: 8I.30.Kf, 61.70.Wp, 75.10.Nr In textbook first-order phase transitions critical fluctuations are negligible: Water shows no hint of incipient solidity above 0°C. First-order solid-solid displacive transformations are strikingly different; precursors are common for tens through hundreds of degrees away from the transitions. We study here the tweed pattern [l] observed in electron micrographs well above the transition temperature in the so-called medium and weak martensites, including the shape-memory alloys FePd [2] and NiAl [3], the superconducting ^-15's [4], and high-T^ Y-Ba-Cu-Co-O, and Y-Ba-Cu-Al-O [5,6]. The tweed appears as a characteristic cross-hatched pattern. X-rayand electron-dilTraction measurements [2,3,7-10] indicate that tweed is a local mixture of undeformed and deformed regions, and that it arises from a local {llO}/

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Section: /((!>)-= [Arit-to)-^arl7](xy) -7]o]}(p^mentioning

confidence: 91%

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confidence: 98%

Spin-glass nature of tweed precursors in martensitic transformations

et al. 1991

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“…The resulting tweed patterns were experimentally observed in V 3 Si by Goringe et al [143] and Onozuka et al [144]. This phenomenon has sparked a lot of scientific interest such as the computational investigation by Kartha et al [145].…”

Section: Discussionmentioning

confidence: 86%

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Mentink

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This work is the result of efforts by many people, both in a professional and a personal sense. During my time in Berkeley I had the opportunity to work with friendly and supportive people who were pushing back scientific boundaries, regarding the limits of superconducting high field technology. It is an odd but good experience to read papers from various authors detailing one scientific breakthrough or another, and then to meet them in person. Being a multi-cultural hub, Berkeley also allowed me to meet and become friends with people from all corners of this planet.Along the way, people have been instrumental in making this research happen. At LBNL, Jonathan Slack, Reuben Mendelsberg, and Andre Anders allowed me to use their lab for a rather extended period of time thus allowing for the fabrication of thin films, and have helped in various other ways along the years. The people at Ohio State University have helped by repeatedly performing heat capacity measurements on Nb 3 Sn bulk samples which were kindly supplied by Wilfried Goldacker of the Karlsruhe Institute of Technology. In particular I would like to thank Mike Susner of the Ohio State University, who came to the lab in the weekends just to make sure my samples would get measured. John Bonevich of the National Institute of Science and Technology was kind enough to perform characterization work on some of the Nb-Sn thin films we made, which included the STEM image on the cover. A lot of the experimental work was made possible with software and hardware designed at the University of Twente (such as VI by Bennie ten Haken), and I have gotten useful recommendations and assistance along the way, such as the advice on thin film fabrication from Frank Roesthuis. Professors Marcel ter Brake, Herman ten Kate, David Larbalestier, and Frances Hellman were kind enough to write letters of recommendation which contributed to getting the CSC student fellowship award. Vladimir Kresin of LBNL was kind enough to answer various questions related to the microscopic properties of Nb 3 Sn and comment on the description of microscopic theory in this thesis.Shane Cybart and Stephen Wu have assisted Edwin Dollekamp and myself in attempting to do some very fancy experiments. Edwin, from the University of Twente, took on a complicated research topic and I was impressed with how far he managed to get in that work, and Shane and Stephen invested time in the evenings and weekends to make it happen. Professor Orlandos previous investigations of Nb 3 Sn were an inspiration for some of the work described in this thesis, and he was kind enough to answer questions by email and over the phone. Derek Stewart of the Cornell NanoScale Science and Technology Facility helped me to get familiar with density functional theory calculations and computing clusters and made the suggestion of using Quantum Espresso ab-initio software. Robert Ryne and Steve Gourlay of LBNL helped me getting access to sizeable supercomputing resources at NERSC which were needed for this research.My friends and family st...

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“…Dynamic movement of the mottled pattern with changing temperature was recorded using a video-tape recording system. The result of the in-situ experiment has been reported elsewhere in some detail (20).…”

Section: Commensuration Process Of the Lps Of Ag3mgmentioning

confidence: 85%

“…In-situ TEM observations of the phase transition of V3Si are done at low temperatures using a cold-stage installed in a 1MV electron microscope (19) (20). Special attention is given to the precursor process at above the transition temperature, because it is known that the elastic constant and the lattice constant show anomalous behaviors above the transition temperature, which are relevant to the superconducting transition.…”

Section: Commensuration Process Of the Lps Of Ag3mgmentioning

confidence: 99%

Applications of High Resolution Electron Microscopy to Materials Research

Hirabayashi

1988

Trans. JIM

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This paper reports current results of high resolution transmission electron microscopy done mostly in the author's laboratory. By the use of many-beam imaging technique, quasicrystal structure of rapidly solidified Al-Mn-Si alloys, interface and grain boundary of permanent magnets of Sm-Co based andFurther a commensuration process of the long period superstructure of Ag3Mg at about 600K and the cubic-tetragonal phase transition of V3Si around 13K are observed in-situ for investigating the kinetic behavior of phase transitions.

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Low temperature electron microscopy on the cubic-tetragonal transformation of V3Si

Cited by 21 publications

References 11 publications

Spin-glass nature of tweed precursors in martensitic transformations

Spin-glass nature of tweed precursors in martensitic transformations

An experimental and computational study of srain sensitivity in superconducting Nb3Sn

Applications of High Resolution Electron Microscopy to Materials Research

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