Study of CuAu I by transmission electron microscopy

Hirabayashi, Makoto; Weissmann, S.

doi:10.1016/0001-6160(62)90183-9

Cited by 146 publications

(32 citation statements)

References 10 publications

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“…disordered matrix (14). This is also very similar to the present observation that the coherent precipitates are formed on {011} planes of the ausaged matrix (see Fig.…”

Section: Microstructure Observed By Hremsupporting

confidence: 91%

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy

et al. 1988

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Fine structures of the austenite in an ausaged Fe-28.9Ni-5.7A1 (mass%) alloy have been examined by means of conventional and high resolution transmission electron microscopy and electron diffraction. The ageing treatment was carried out at various temperatures in the range between 673 and 923K for up to 2.88Ms, which gave rise to complicated changes in the martensite-start temperature, Ms, of the alloy. Upon ageing, typically at 823K, the austenite exhibited characteristic fine structures. That is, the conventional transmission electron micrographs showed striations in them and the corresponding electron diffraction patterns did extra reflections other than the fundamental austenite ones and <011>* diffuse streaks. Detailed observations suggested that these fine structures were due to the formation of coherent precipitates with a Ll0 type ordered structure during ausageing, not with the Ll2 or D03 type one previously reported. Fine structures were also observed in the grown precipitates themselves on the later stage of ageing, and they were accounted for by the Ll0 type ordered structure. The relation between the complicated variations in Ms and the microstructural change of austenite upon ausageing was well explained.

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“…disordered matrix (14). This is also very similar to the present observation that the coherent precipitates are formed on {011} planes of the ausaged matrix (see Fig.…”

Section: Microstructure Observed By Hremsupporting

confidence: 91%

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy

et al. 1988

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“…It is well recognized that the tweed microstructure is frequently observed as a microstructural aspects of pre-martensitic phenomena 8) or the initial stage of disorder-order transformation from a cubic to tetragonal phase. 9,10) The reason for formation of the tweed microstructure is attributed to the local tetragonal distortion in the cubic structure. Table 1.…”

Section: Resultsmentioning

confidence: 99%

Electron Microscopy Study of Preferential Variant Selection in CoPt Alloy Ordered under a Magnetic Field

et al. 2013

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Transmission electron microscope (TEM) and scanning transmission electron microscope (STEM) observations were carried out to investigate microstructure formation and variant selection process in L1 0 -type ordered CoPt alloy upon a two-step ordering heat-treatment. The first step corresponds to nucleation process carried out under a magnetic field of 10 T and the second step represents growth process without magnetic field. After the first step of ordering, ordered domains of about 5 nm in size were observed and fraction of the preferred variant with the c-axis parallel to applied magnetic field was slightly higher than that of the other two variants. Formation of tweed microstructure along f011g L10 was confirmed at the initial stage of ordering. This structure is considered to be derived from the periodic alignment of interface between two ordered variants with twin relation. At the early stage of the second step of ordering, numerous micro-twins were formed through tweed microstructure and the volume fraction of the preferred variant was increased accompanying with modulation of twins, while that of other two variants was decreased. After the second step of ordering, the twins were vanished and single variant was obtained.

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“…However, these X-ray studies give no direct information about any structural changes during the ageing process of quenched specimens. On the other hand, those changes in the crystal structure and properties of stoichiometric CuAu which are produced by heattreatments have been the subject of various studies on evaporated alloy thin films(4)(5), sputtered alloy thin films (6), filed powder specimens (7) and metallic films electrochemically thinned from bulk materials (8). On the contrary, there have never been any important studies on the hardening mechanism in dental gold alloys, though they are considered to be indispensable.…”

Section: Introductionmentioning

confidence: 99%

Electron Microscope Observation in an Age-Hardenable Dental Gold Alloy

Yasuda

Kanzawa

1977

Trans. JIM

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Transmission electron microscopy and electron diffraction studies have been carried out in order to make clear the crystallography and morphology of strengthening phases in a dental gold alloy, Au-35.4 at %Cu-17.8 at %Ag-9.7 at %Pd. Age-hardening observed in this alloy is caused by the formation of the AuCu I type tetragonal superlattice nuclei on the disordered matrix {100} planes. The interfacial coherency between the AuCu I type superlattice and the disordered matrix has been studied by referring to diffuse scattering in diffraction patterns and striated contrasts observed in the electron micrographs. The significant hardness increase is considered to be associated with the striated contrasts due to the tetragonal distortion. The structure of the final state has been identified as the AuCu I type ordered platelets which have the c-axis distributed along the three cube axes and have the [011] twin relation. Nodular precipitates formed at grain boundaries play no important role in the age-hardening.Rkeceived May 22, 1976) ‡T .

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Study of CuAu I by transmission electron microscopy

Cited by 146 publications

References 10 publications

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy

Electron Microscopy Study of Preferential Variant Selection in CoPt Alloy Ordered under a Magnetic Field

Electron Microscope Observation in an Age-Hardenable Dental Gold Alloy

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Study of CuAu I by transmission electron microscopy

Cited by 146 publications

References 10 publications

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe&ndash;Ni&ndash;Al Alloy

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe&ndash;Ni&ndash;Al Alloy

Electron Microscopy Study of Preferential Variant Selection in CoPt Alloy Ordered under a Magnetic Field

Electron Microscope Observation in an Age-Hardenable Dental Gold Alloy

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Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy

Electron Microscope Study on Fine Structures of the Austenite in an Ausaged Fe–Ni–Al Alloy