Defect structures in low stacking fault energy CuGe solid solutions

Moroz, P.J.; Taggart, R.; Polonis, D.H.

doi:10.1016/0025-5416(86)90405-2

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…**Intersecting bundles of stacking faults have been reported for the as-prepared state in Ref. [9], and are interpreted as consequence of the strains due to the rapid cooling (quenching).…”

Section: Growth Modementioning

confidence: 88%

“…[19] It has been reported that SFs (intrinsic in nature) are the principal lattice defects observed in supersaturated Cu(Ge) solid solutions when quenched from solution temperatures, down to room temperature. [1,9] The allotropic fcc fi hcp phase transformation (e.g., in the Co-Ni system) takes place by a change in the stacking sequence of the closed-packed planes (from fcc to hcp): the glide in a common direction for a stack of closed-packed layers of Shockley partial dislocations, with a 1=6ah112i fcc ¼ 1=3a h1 100i hcp -type Burgers vector, [20] along every alternate (every second) closed-packed plane, [21] changes the stacking sequence of the closed-packed planes in the stack considered from fcc (ABCABC…) to hcp (ABABAB…), or vice versa.…”

Section: A the Fcc Fi Hcp Transformationmentioning

confidence: 99%

“…[9] Segregation of Ge to SFs could not be shown by analytical techniques (e.g., energy-dispersive X-ray spectroscopy), but Ge segregation was indirectly indicated from the emergence of diffuse scattering in XRD patterns (between the 111 a and 101 f reflections). [1] In the Al-Ag system, the fcc fi hcp phase transformation generally requires a larger compositional change (the hcp plates consist of~60 at.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics of the fcc → hcp Phase Transformation in Cu-Ge Solid Solutions Upon Isothermal Aging

Polatidis

Zotov

Bischoff

et al. 2017

Metall Mater Trans A

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The kinetics of the f-phase formation from a supersaturated a-Cu(Ge) solid solution (i.e., transformation from the fcc crystal structure to the hcp crystal structure) containing 10.8 at. pct Ge [at isothermal temperatures of 573 K, 613 K, and 653 K (300°C, 340°C, and 380°C)] were studied by X-ray diffraction (XRD) for phase fraction determination. Both in situ and ex situ annealing experiments were performed. The transformation kinetics were modeled on the basis of a versatile modular model. The transformation kinetics complied with a site-saturation nucleation mode and strongly anisotropic interface-controlled growth mode in association with a corresponding impingement mode: diffusion of Ge (towards the stacking faults, SFs) does not control the transformation rate. Transmission electron microscopy (TEM) investigations showed that segregation of Ge at the stacking faults (SFs) takes place (relatively fast) prior to the structural transformation (fcc fi hcp).

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“…**Intersecting bundles of stacking faults have been reported for the as-prepared state in Ref. [9], and are interpreted as consequence of the strains due to the rapid cooling (quenching).…”

Section: Growth Modementioning

confidence: 88%

Section: A the Fcc Fi Hcp Transformationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Kinetics of the fcc → hcp Phase Transformation in Cu-Ge Solid Solutions Upon Isothermal Aging

Polatidis

Zotov

Bischoff

et al. 2017

Metall Mater Trans A

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Thermally activated martensite in copper alloys

1987

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Study on solid state reactions of nanocrystalline Cu–Ge alloys upon mechanical alloying and annealing

2013

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The structural evolution of Cu–12 wt·%Ge (∼Cu–11 at·%Ge) alloy processed by means of mechanical alloying (MA) with subsequent heat treatment was studied using X-ray diffraction profiles, scanning electron microscopy, transmission electron microscopy (TEM) and high resolution TEM observations as well as differential thermal analysis(DTA). The fcc Cu(Ge) solid solution (α) was produced at early stages of MA and amorphised upon further milling. This was followed by the formation of ζ−Cu5Ge intermetallic nanocrystals after 40 h of milling. The subsequent annealing process led to the nanocrystallisation of the amorphous powder. The X-ray crystallite size data showed the exceptional thermal stability of the alloy prepared. The mechanism of the stability was also investigated. In addition, a thermodynamic analysis based on Miedema's semiempirical model was carried out for the evaluation of the experimental results and a good agreement was found between them.

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Defect structures in low stacking fault energy CuGe solid solutions

Cited by 3 publications

References 20 publications

Kinetics of the fcc → hcp Phase Transformation in Cu-Ge Solid Solutions Upon Isothermal Aging

Kinetics of the fcc → hcp Phase Transformation in Cu-Ge Solid Solutions Upon Isothermal Aging

Thermally activated martensite in copper alloys

Study on solid state reactions of nanocrystalline Cu–Ge alloys upon mechanical alloying and annealing

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