Dislocation loops in AlZn and AlZnMg alloys

Czurratis, Peter; Keoggel, R.; Syneček, V.; Simerská, M.; Löffler, H.

doi:10.1002/pssa.2211060211

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…2(c)) might possess non-planar configuration composed of alternating {111} planes, since the {110} habit plane is not close-packed in FCC lattice. This can be implied by the formation of perfect loops, with similar crystallographic characters but of vacancy-type, in quenched Al-based alloys [25] via the dissociation and reorientation of Frank loops [26]. We also note that Fig.…”

Section: Structure Of Dislocation Loopsmentioning

confidence: 58%

Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys

et al. 2017

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Single-phase concentrated solid solution alloys have attracted wide interest due to their superior mechanical properties and enhanced radiation tolerance, which make them promising candidates for the structural applications in next-generation nuclear reactors. However, little has been understood about the intrinsic stability of their as-synthesized high-entropy configurations against radiation damage. Here we report the element segregation in CrFeCoNi, CrFeCoNiMn, and CrFeCoNiPd equiatomic alloys when subjected to 1250 kV electron irradiations at 400 °C up to a damage level of 1 displacement per atom. Cr/Fe/Mn/Pd can deplete and Co/Ni can accumulate at radiation-induced dislocation loops, while the actively segregating elements are alloy-specific. Moreover, electron-irradiated matrix of CrFeCoNiMn and CrFeCoNiPd shows L1 0 (NiMn)-type ordering decomposition and <001>-oriented spinodal decomposition between Co/Ni and Pd, respectively. These findings are rationalized based on the atomic size difference and enthalpy of mixing between the alloying elements, and identify a new important requirement to the design of radiation-tolerant alloys through modification of the composition.

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Section: Structure Of Dislocation Loopsmentioning

confidence: 58%

Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys

et al. 2017

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“…Figure 2 shows diffraction contrast analysis of a representative faulted loop. been reported previously [26]. These were assumed to evolve during the growth of vacancy-type Frank loops, which firstly unfaulted by absorption/nucleation of a Shockley partial dislocation [27], then reoriented from (111) to (110) habit plane by gliding along its Burgers vector [28].…”

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confidence: 94%

Enhanced damage resistance and novel defect structure of CrFeCoNi under in situ electron irradiation

Wang

Jin

et al. 2016

Scripta Materialia

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Defect production and growth in CrFeCoNi, a single-phase concentrated solid solution alloy, is characterized using in situ electron irradiation inside a transmission electron microscope operated at 400~1250 kV and 400 °C. All observed defects are interstitial-type, either elliptical Frank loops or polygonal (mostly rhombus) perfect loops.Both forms of loops in CrFeCoNi exhibit a sublinear power law of growth that is more than 40 times slower than the linear defect growth in pure Ni. This result shows how compositional complexity impacts the production of Frenkel pairs and the agglomeration of interstitials into loops, and, thus, enhances the radiation tolerance.

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Evaluation of the critical size for the nucleation of precipitates in AlZn alloys

Löffler

Wendrock

Simmich

1992

Phys. Stat. Sol. (a)

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On the basis of Becker's classical theory of nucleation and evaluations of the volume, surface, and coherency stress parts of the free enthalpy, the critical sizes for the homogeneous nucleation of fully coherent Guinier‐Preston zones as well as precipitates of the partially coherent α′m‐phase are calculated. In addition the heterogeneous nucleation of precipitates at edge dislocations is considered. The obtained results agree well with experimental observations.

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Dislocation loops in AlZn and AlZnMg alloys

Cited by 3 publications

References 24 publications

Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys

Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys

Enhanced damage resistance and novel defect structure of CrFeCoNi under in situ electron irradiation

Evaluation of the critical size for the nucleation of precipitates in AlZn alloys

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