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Titolo:
Loss of stress equivalence in the strain-rate sensitivity of flow stress in fine-grain polycrystalline copper
Autore:
Butt, MZ; Ashraf, M;
Indirizzi:
Govt Coll, Dept Phys, Met Res Labs, Lahore 54000, Pakistan Govt Coll Lahore Pakistan 54000 ys, Met Res Labs, Lahore 54000, Pakistan Islamia Univ, Dept Phys, Bahawalpur 63120, Pakistan Islamia Univ Bahawalpur Pakistan 63120 Phys, Bahawalpur 63120, Pakistan
Titolo Testata:
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH
fascicolo: 2, volume: 173, anno: 1999,
pagine: 349 - 356
SICI:
0031-8965(199906)173:2<349:LOSEIT>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NB ALLOY CRYSTALS; RELAXATION RATE; SIZE; NICKEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Butt, MZ Govt Coll, Dept Phys, Met Res Labs, POB 1072, Lahore 54000, Pakistan Govt Coll POB 1072 Lahore Pakistan 54000 Lahore 54000, Pakistan
Citazione:
M.Z. Butt e M. Ashraf, "Loss of stress equivalence in the strain-rate sensitivity of flow stress in fine-grain polycrystalline copper", PHYS ST S-A, 173(2), 1999, pp. 349-356

Abstract

The strain-rate sensitivity of flow stress (3.7 x 10(-3) s(-1) reversible arrow 3.7 x 10(-4) s(-1)) in fine-grain polycrystalline copper has been studied over the entire stress-strain curve at room temperature. It is observed that the yield stress varies with mean grain diameter (32 to 59 mu m) in accord with the Hall-Fetch relation, whereas ultimate tensile stress and fracture stress are independent of the grain size. The strain-rate sensitivity aa of a given flow stress a depends on the grain size; it increases as grain size is increased from 32 to 59 mu m. For a given grain size, the Cottrell-Stokes ratio Delta sigma/sigma and the product of flow stress a and associated activation volume V-sigma remain constant in the entire stress range 50 to 210 MPa studied. Values of both Delta sigma/sigma and V(sigma)sigmadepend on the grain size. The observations have been accounted for within the framework of Feltham's single barrier model of plastic flow.

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Documento generato il 06/04/20 alle ore 03:08:27