Thermally activated martensite in copper alloys

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

doi:10.1007/bf01103519

Cited by 6 publications

(6 citation statements)

References 23 publications

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“…±ÇÓÇØÑAE ¤¸¬ ÔÕÓÖÍÕÖÓÞ Ä ÅÇÍÔÂÅÑÐÂÎßÐÖá ÒÎÑÕÐÑ-ÖÒÂÍÑÄÂÐÐÖá (¤±µ) Ä ËÊÑÕÇÓÏËÚÇÔÍËØ ÖÔÎÑÄËâØ (ÒÓË ÕÇÏÒÇÓÂÕÖÓÇ 300 ë 800 C) ËÊÖÚÇÐ Ä ÔÒÎÂÄÂØ Cu ë (10,5 ë 12,2) ÏÂÔ.% Ge Ô ÒÑÏÑÜßá ÑÒÕËÚÇÔÍÑÅÑ ÏËÍÓÑÔÍÑÒÂ [79] [102]. ¤ËÔÕÇÓÇ-ÊËÔ DP ÎËÐÇÌÐÑ ÖÄÇÎËÚËÄÂÇÕÔâ ÒÓË ÔÐËÉÇÐËË ÕÇÏÒÇÓÂ-ÕÖÓÞ T:…”

Section: ¬ëðçõëíâ ëêñõçóïëúçôíñåñ ïâóõçðôëõðñåñunclassified

Isothermal martensitic transformations

Lobodyuk¹,

Éstrin²

2005

Usp. Fiz. Nauk

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¡ÐÂÎÑÅËÚÐÑÇ ÔÑÑÕÐÑÛÇÐËÇ ÐÇÒÑÔÓÇAEÔÕÄÇÐÐÑ ÔÎÇAEÖÇÕ Ë ËÊ ÎËÐÇÌÐÑÌ ÊÂÄËÔËÏÑÔÕË àÐÇÓÅËË ÂÍÕËÄÂÙËË ª®± Ä ÔÒÎÂÄÂØ Fe ë Ni ë Mn, ÒÑÎÖÚÇÐÐÑÌ Ä [103] (ÓËÔ. 13): Martensite transformations have long been considered most characteristically athermal ì in the sense that they develop, with changing temperature, at a tremendous temperature-independent rate and cease to occur at isothermal conditions. Over the past decades, however, isothermal martensite transformations (IMTs) have been discovered and studied, which take long to develop and occur at low temperatures. This review covers basic experimental data on IMT kinetics, discusses the way IMTs are affected by various inêuences, examines the current theoretical understanding of their nature, and looks at how they relate to kinetically different phase transformations and other thermally activated low-temperature processes in solids.

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Section: ¬ëðçõëíâ ëêñõçóïëúçôíñåñ ïâóõçðôëõðñåñunclassified

Isothermal martensitic transformations

Lobodyuk¹,

Éstrin²

2005

Usp. Fiz. Nauk

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“…With the known concentrations of the standard material, C Cu and C Ge , and the measured values of the corresponding characteristic X-ray intensities, I Cu and I Ge , the microscope-dependent correction factor K CuGe = 1.29 was determined using Eq. [2]. Then, applying Eq.…”

Section: Microscopy Studiesmentioning

confidence: 99%

“…Then, applying Eq. [2] again by using the constant K CuGe and the measured values of the characteristic X-ray intensities I Cu and I Ge pertaining to the actual specimen, a value for the local composition of the specimen was obtained.…”

Section: Microscopy Studiesmentioning

confidence: 99%

“…IN the Cu-Ge and Cu-Si systems, an fcc fi hcp phase transformation (i.e., starting from supersaturated a-Cu(Ge) and a-Cu(Si) solid solutions) can take place upon isothermal annealing [1][2][3] and/or deformation. [1] In the Cu(Ge) system, the hcp product phase is called f-phase.…”

Section: Introductionmentioning

confidence: 99%

“…[1] In the Cu(Ge) system, the hcp product phase is called f-phase. The precipitation of the f-phase from supersaturated Cu(Ge) solid solutions complies with the same crystallographic orientation relationship as holds for the fcc fi hcp phase transformations observed in Co, Ag-Al, etc., i.e.,ð11 1Þa==ð0001Þf; ½ 110 a==½11 20 f. [1,2,[4][5][6] In contrast with the allotropic fcc fi hcp phase transformation occurring in Co, [7] the transformation in the Cu-Ge system is associated with compositional changes [1,8] (cf. Figure 1) and therefore the transformation mechanism is an intermediate class of a diffusionless, displacive, martensitic fcc fi hcp phase transformation and a diffusional phase transformation: Ge must diffuse to the f-phase nucleation sites and/or the growing f-phase plates to establish the f-phase composition.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Isothermal martensitic transformations

Lobodyuk¹,

Éstrin²

2005

Phys.-Usp.

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Thermally activated martensite in copper alloys

Cited by 6 publications

References 23 publications

Isothermal martensitic transformations

Isothermal martensitic transformations

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

Isothermal martensitic transformations

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