Abstract
Previous investigations have shown the room temperature upper and lower yield point stress of b.c.c. iron and molybdenum can be completely removed by initially “elastic” cyclic stressing above the fatigue limit. The work described in this paper shows that the upper and lower yield point stresses in niobium can also be removed under these same conditions. The cyclic stress-strain curve of niobium was found cyclically to strain soften at small strain amplitudes and cyclically to strain harden at larger strains. Under constant cyclic strain amplitudes in the inelastic region, niobium cyclically strain hardens and quickly reaches a stable hysteresis loop. The cyclic yield point behavior described is explained in terms of localized cumulative multiplication of mobile dislocations.
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