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Titolo:
Phase stability of decomposed Ni-Al alloys under ion irradiation - art. no. 224113
Autore:
Schmitz, G; Ewert, JC; Harbsmeier, F; Uhrmacher, M; Haider, F;
Indirizzi:
Univ Gottingen, Inst Mat Phys, D-37073 Gottingen, Germany Univ Gottingen Gottingen Germany D-37073 hys, D-37073 Gottingen, Germany Univ Gottingen, Inst Phys 2, D-37073 Gottingen, Germany Univ Gottingen Gottingen Germany D-37073 s 2, D-37073 Gottingen, Germany Univ Augsburg, Lehrstuhl Expt Phys 1, D-86159 Augsburg, Germany Univ Augsburg Augsburg Germany D-86159 Phys 1, D-86159 Augsburg, Germany
Titolo Testata:
PHYSICAL REVIEW B
fascicolo: 22, volume: 6322, anno: 2001,
pagine: 4113 -
SICI:
0163-1829(20010601)6322:22<4113:PSODNA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
DISPLACEMENT CASCADES; MOLECULAR-DYNAMICS; REORDERING KINETICS; DEFECT PRODUCTION; ORDER-DISORDER; NI3AL; EVOLUTION; DISSOLUTION; TRANSITIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Schmitz, G Univ Gottingen, Inst Mat Phys, Hosp Str 3-7, D-37073 Gottingen,Germany Univ Gottingen Hosp Str 3-7 Gottingen Germany D-37073 Germany
Citazione:
G. Schmitz et al., "Phase stability of decomposed Ni-Al alloys under ion irradiation - art. no. 224113", PHYS REV B, 6322(22), 2001, pp. 4113

Abstract

The disordering of a decomposed Ni-12 at. %-Al alloy under irradiation with 300-keV Ni+ ions is studied in direct comparison to homogeneous Ni3Al at various temperatures. For that, the degree of long-range order is quantitatively determined by electron diffractometry. Heterogeneous alloys disorder significantly faster than the homogeneous intermetallic. In addition. theirdisordering rate depends on the precipitate size of the microstructure. At823 K a steady state with an intermediate degree of order is reached. The experimental results are compared with model calculation based on a Cahn-Hilliard-type continuum model. At higher temperatures the model yields a correct description of the experiments. However, discrepancies at room temperature suggest a direct coupling of local composition and degree of order during the collision cascade. This interpretation is further supported by MonteCarlo simulations of overlapping cascade events.

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Documento generato il 03/04/20 alle ore 10:57:13