中性子回折法による無ひずみ状態の格子面間隔測定に関する測定技術の開発(<特集>X線材料強度)

概要

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For precise stress analysis of engineering materials by diffraction methods, lattice spacing of strain-free materials, d_0, must be accurately measured and estimated. Powder diffraction method is a general way of determining the d_0. However, preparation of high quality powder sample is actually difficult in that labor, time, knowledge, and technique are required. In this study, we propose a new easy technique of measuring the sample as original process material instead of the powder diffraction method for estimation of accurate d_0. The d_0 obtained by our technique is estimated from the d_Ave which is the average of d measured while turning the sample material at random. The strain-free lattice constant, a_0, is calculated from d_Ave(hkl) of some diffraction planes by the extrapolation method. The d_0(hkl) of each diffraction plane is converted from this a_0. In own method, the d_0(hkl) of the extra super duralumin which have the structure of the texture was measured. To examine the reliability of this new method, the d_0(hkl) obtained by own method was compared with the d_0(hkl) of powder estimated by the general methods which is neutron and X-ray diffraction method. These differences were 8.7×10^-6 nm or less. These values become 10MPa or less for the stress. This result confirmed that present method could calculate d_0(hkl) with enough accuracy for the neutron residual stress analysis.
社団法人日本材料学会の論文
2001-07-15