粗大結晶アルミニウムの引張塑性変形に関するX線的研究

残留ひずみと方位関数との関係について

抄録

Several studies have so far been reported on the distribution of elongation in individual grains of coarse grained aluminium specimen due to simple tension.
In this study coarse grained flat aluminium specimens with grain sizes of about 2mm and 4mm were measured by the oscillating crystal method, specially using Cok_α radiations for measurement of the six normal strains in random directions.
From these measured strains and orientation of each crystal, longitudinal and lateral residual strains, principal residual strain, principal residual shear strain and the direction of principal maximum residual strains of individual grains were calculated based on the theory of elasticity.
The experimental results obtained may be summarized as follows. The longitudinal as well as the lateral residual strains were in compression for smaller orientation function, and in tension for larger orientation function, their absolute values being proportional to the orientation function. Their principal maximum residual strains showed a similar tendency to the above longitudinal strains, while on the contrary their principal maximum residual shear strains showed an inverse trend. The angles between the direction of their principal maximum residual strain and longitudinal axis were larger for greater orientation function. These angles decreased with the increase of the applied strain. Both the defferences in their principal residual strains and their principal shear strains between the neighbouring grains were remarkable as the difference of orientation function increased.