Action of Current Pulses on Zinc Single Crystals during Creep

Abstract

The effect of a current pulse is investigated on zinc single crystals during creep at the unstable stage at 78 K which is accompanied by a considerable increase in the creep rate and a discontinuous increase in deformation. These values depend on the duration of current pulses, amplitude and recurrence rate of pulses, passage mode of the current, external conditions of deformation and inner state of the metal. During the action of the current the creep at the unstable stage obeys a logarithmic law. The observed mechanical effects can be accounted for on the basis of conceptions about the concentration of tensions created by the current on real structure defects which are due to appearance of additional forces affecting the thermoactivated and dynamic motion of dislocations.

Recent advances and challenges in electroplastic manufacturing processing of metals

“…In 1963, EPE was first discovered and reported by Troistkii and Likhtman. 1 Subsequently, Troistkii et al, [2][3][4][5][6][7][8][9][10][11][12][13][14] researchers in Russia, [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Conrad et al, [33][34][35][36][37][38][39][40][41][42] and other investigators in the United States 43-46 conducted a series of extensive studies on the effects of drift electrons on the flow stress in a variety of metals. These investigations were carried out by mainly two ways of providing the drift electrons, namely, continuous electrical current and high density (10 3 -10 5 A/cm 2 ) electrical pulses ($100 mm duration).…”

Manipulation of matter by electric and magnetic fields: Toward novel synthesis and processing routes of inorganic materials

“…This could finally enable the synthesis of functional materials consisting of earth abundant materials; a prominent example would be ordered FeNi (L1 0 ) to replace eventually rare earth based permanent magnets [1,2,3,4] and materials for energy conversion and storage like proton conductors [5], or solidstate Li/Na batteries [6,7]. Evidence for the interactions between external electromagnetic fields, diffusion and deformation mechanisms has been gathered during the 1980s-1990s for metals and ceramics [8,9,10,11,12,13,14,15,16]. Numerous recent review articles and books [17,18,19,20,21,22,23] underline the high current interest in the scientific community in this exciting yet complex field of research.…”