Successive Stress Relaxation Observed on Molybdenum Polycrystals in Pre-Yield Region

概要

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In order to study the plastic deformation behavior of b.c,c. metals in the region near the yield point, the successive stress relaxation method was developed. Results obtained with molybdenum polycrystals having two different yield strengths were analyzed to show that the true plastic strain rate can be expressed in terms of the product of two functions, one being dependent solely on the plastic strain while the other on the applied stress only, i.e., ε∝ f(ε)g(σ). It turned out that those functions are in the form of f(ε) ∝ε and g(σ) ∝ σ ^m or exp (-Dlσ), respectively. This appears to support the Johnston-Gilman concept for the region concerned, on which the contribution of mobile dislocations to yielding behavior was examined separately in terms of the mobility and the density. Various parameters characterizing dislocations are compared between the two kinds of samples.
社団法人日本物理学会の論文
1967-03-05