Dynamical Behavior of Ordering with Phase Separation in Off-Stoichiometric Fe&lt;SUB&gt;3&lt;/SUB&gt;Si Alloys

Matsumura, Shuichi; Oyama, Hitoshi; Oki, K.

doi:10.2320/matertrans1989.30.695

Cited by 35 publications

(14 citation statements)

References 27 publications

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“…The current study exhibits a qualitatively-similar phaseevolution pathway[15]. Liebscher et al suggested possible mechanisms on the formation of the hierarchical structure in the precipitates[32,[42][43][44], which involves a wetting transition or heterogeneous nucleation on L2 1 APBs[15,43,44]. The narrow anti-phase domain boundary formed within the L2 1 precipitate is believed to be responsible for the formation of the fine lamellar-type (hierarchical) structure for the 2% Ti alloy.…”

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confidence: 60%

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

et al. 2017

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Precipitate features, such as the size, morphology, and distribution, are important parameters determining the mechanical properties of semi-or fully-coherent precipitatehardened alloys at elevated temperatures. In this study, the microstructural formation and evolution of recently-developed Fe-Ni-Al-Cr-Ti alloys with superior creep resistance have been systematically investigated using transmission-electron microscopy (TEM), scanning-electron microscopy (SEM), and atom-probe tomography (APT). These alloys were designed by adding 2 or 4 weight percent (wt. %) Ti into a NiAl-hardened ferritic alloy with a nominal composition of Fe-6.5Al-10Cr-10Ni-3.4Mo-0.25Zr-0.005B in wt. %. These alloys were, then, subjected to a homogenization treatment at 1,473 K for 0.5 hour, followed by aging treatments at 973 K for 1 ~ 500 hours. In the homogenization-treated case, both alloys contain a primary L2 1-type Ni 2 TiAl precipitate, but with the distinct size and morphology of the precipitates and precipitate/matrix interface structures. In the subsequent aging treatments, the 2 wt. % Ti alloy establishes a hierarchical-precipitate structure consisting of a fine network of a B2-type NiAl phase within the parent L2 1-type Ni 2 TiAl precipitate, while the 4 wt. % Ti alloy retains the single Ni 2 TiAl precipitate. It was found that the hierarchical structure is more effective in remaining the coherent interface during the growth/coarsening of the precipitate. The formation of the different types of the precipitates, and their effects on the microstructural evolution are discussed, and the driving forces for these features are identified from the competition between the interface energy and elastic interactions due to the lattice misfit and misfit dislocations.

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confidence: 60%

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

et al. 2017

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“…The model 2 qualitatively corresponds to the Fe-Si-type alloys. The v n -values for this model were taken from the MFA calculations of Inden [31] which satisfactorily describe the relevant part of the observed Fe-Si phase diagram [4,32] with the following relations [33]:…”

Section: Models and Methods Of Simulationmentioning

confidence: 99%

“…Later stages correspond to the formation of more or less extended ordered regions which are more conveniently described by local order parameter distributions. Such distributions are experimentally observed in the diffraction transmission electron microscopy (TEM) images where the reflection intensity for a certain superstructure vector is proportional to the squared value of the relevant order parameter [1][2][3][4][5][6][7]. In particular, for the vector g 1 defined in equation 1the reflection intensity for the homogeneous D0 3 phase is proportional to η 2 and vanishes at η-APBs, while for the vector g 2 in equation 2this intensity for the homogeneous D0 3 phase is proportional to ζ 2 and vanishes both at ζ -APBs and η-APBs [6].…”

Section: A2mentioning

confidence: 99%

Kinetic features of alloy ordering with many types of ordered domain: D0₃-type orderings

Belashchenko

Samolyuk

Vaks

1999

J. Phys.: Condens. Matter

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The earlier-described master equation approach to the configurational kinetics of nonequilibrium alloys is used to study kinetic features of 'multivariant' orderings for which more than two types of ordered domain are possible. To this end we make extensive simulations of various phase transformations involving D0 3-type orderings for a number of alloy models. The microscopic structure of various antiphase boundaries in the D0 3 phase is also studied. A consistent approach to describing the effect of elastic forces on microstructural evolution is outlined and used to study the kinetics of a multivariant ordering accompanied by alloy decomposition. Our simulations reveal a number of peculiar kinetic features of multivariant orderings, many of them agreeing well with experimental observations.

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“…It occurs during decomposition of a homogeneous disordered phase into a two-phase mixture of ordered and disordered phases. Its dynamics has been explored recently by various techniques including computer simulations [1][2][3], thermodynamic stability analyses [4][5][6], and experiments [7][8][9][10]. However, the efifect of long-range Coulomb interaction on the nonlinear dynamics of ordering and phase separation seems to have never been discussed, although it is directly related to the interesting phenomenon of nanoscale ordered domain formation in oxide compounds, /^ (^1/3^2/3)03, where A, B\ and B" are cations with different valences.…”

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confidence: 99%

Dynamics of simultaneous ordering and phase separation and effect of long-range Coulomb interactions

Chen

Khachaturyan

1993

Phys. Rev. Lett.

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The dynamics of simultaneous ordering and phase separation in the presence of a long-range Coulomb interaction is investigated by a computer simulation. It is shown that an intermediate nonstoichiometric ordered single phase appears as a transient phase during decomposition of a binary homogeneous disordered solid solution into an equilibrium two-phase mixture of ordered and disordered phases. Introduction of the long-range Coulomb interactions results in a mesoscale phase which consists of periodical arrays of ordered phase particles embedded in a disordered matrix.

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Dynamical Behavior of Ordering with Phase Separation in Off-Stoichiometric Fe<SUB>3</SUB>Si Alloys

Cited by 35 publications

References 27 publications

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

Kinetic features of alloy ordering with many types of ordered domain: D0₃-type orderings

Dynamics of simultaneous ordering and phase separation and effect of long-range Coulomb interactions

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Dynamical Behavior of Ordering with Phase Separation in Off-Stoichiometric Fe<SUB>3</SUB>Si Alloys

Cited by 35 publications

References 27 publications

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

Microstructural evolution of single Ni2TiAl or hierarchical NiAl/Ni2TiAl precipitates in Fe-Ni-Al-Cr-Ti ferritic alloys during thermal treatment for elevated-temperature applications

Kinetic features of alloy ordering with many types of ordered domain: D03-type orderings

Dynamics of simultaneous ordering and phase separation and effect of long-range Coulomb interactions

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Kinetic features of alloy ordering with many types of ordered domain: D0₃-type orderings