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Titolo:
Dynamic recrystallization in pure magnesium
Autore:
Sitdikov, O; Kaibyshev, R;
Indirizzi:
Inst Met Superplast Problems, Ufa 450001, Russia Inst Met Superplast Problems Ufa Russia 450001 blems, Ufa 450001, Russia
Titolo Testata:
MATERIALS TRANSACTIONS
fascicolo: 9, volume: 42, anno: 2001,
pagine: 1928 - 1937
SICI:
1345-9678(200109)42:9<1928:DRIPM>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
AUSTENITIC STAINLESS-STEEL; CLOSE-PACKED METALS; WARM DEFORMATION; TEMPERATURE; MECHANISM; ALLOY;
Keywords:
pure magnesium; dynamic recrystallization; twinning; basal slip;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Sitdikov, O Inst Met Superplast Problems, Khalturina 39, Ufa 450001, Russia Inst Met Superplast Problems Khalturina 39 Ufa Russia 450001
Citazione:
O. Sitdikov e R. Kaibyshev, "Dynamic recrystallization in pure magnesium", MATER TRANS, 42(9), 2001, pp. 1928-1937

Abstract

Microstructural evolution of commercial grade pure magnesium was studied during plastic deformation by torsion under high pressure at ambient temperature and by compression at temperatures ranging from 293 to 773 K and at a strain rate of 3 x 10(-3) s(-1). Grain refinement takes place by operation of dynamic recrystallization (DRX) at all examined temperatures. The mechanisms of DRX change with temperature and strain. As a result, unusual dependencies of recrystallized grain size against strain and recrystallized volume fraction against temperature are observed. In the temperature interval of293-623 K the deformation twinning results in "twin" mechanism of DRX, which processes strain softening at an initial stage of deformation. At T < 423 K the other mechanism of low temperature DRX takes place at high strains. Such DRX is accompanied by strain hardening. In contrast, continuous DRX (CDRX) yielding a steady-state flow operates frequently at temperatures ranging from 523 to 773 K. CDRX occurs mainly in overall recrystallization process at elevated temperatures. Discontinuous DRX (DDRX) takes place by bulging of boundaries of coarse recrystallized grains evolved from twins it T = 723 K. DDRX occurs repetitively, but gives an insignificant contribution into total recrystallization process. The present results suggest that the mechanisms of DRX and the deformation mechanisms are closely related.

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Documento generato il 04/04/20 alle ore 20:05:26