Yield stress, polymorphic transformation, and spall fracture of shock-loaded iron in various structural states and at various temperatures

Zaretsky, E.B.; Kanel, G.I.

Авторы: Zaretsky E.B., Kanel G.I.
Журнал: Journal of Applied Physics
Том: 117
Номер: 19
Год издания: 2015
Издательство: AIP Publishing
Местоположение издательства: United States
Первая страница: 195901-1
Последняя страница: 195901-10
DOI: 10.1063/1.4921356
Аннотация: The response of polycrystalline iron of 99.5-% purity was studied in a series of planar impact experiments with the samples of different thickness having initial temperatures ranged between 300 and 1233 K. In experiments, the free surface velocity histories of the shocked samples were recorded. Almost all the histories had a three-wave structure containing an elastic precursor and two plastic, and , waves. It was found that at 300, 900 and 1039 K (some 5 K apart the iron's Curie point) decay of the wave with propagation distance is characterized by two different regimes; the fast one corresponding to the plastic strain rates above ~10^5 s^-1, and the slow one at lower strain rates. Since the shear stress at which the change-over takes place is very close to the Peierls stress of iron we assume that above this stress the decay is governed by the phonon-damped over-barrier dislocation motion while below it the governing mechanism is the thermally activated generation and motion of the dislocation kinks. Based on the parameters of the and waves the initial and maximum rates of the transformation in iron have been estimated. It was found that approaching the Curie point associated with substantial, by 2-3 times, increase of the transformation rate.
Добавил в систему: Канель Геннадий Исаакович

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Yield stress, polymorphic transformation, and spall fracture of shock-loaded iron in various structural states and at various temperaturesстатья

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