抄録
The X-ray elastic constant of sintered alumina with powder purities of 99%, 96% and 92% was determined for two diffraction planes, (2. 1. 10) and (1 4 6), by using Fe-Kα and Cu-Kα radiations. The effects of purity and diffraction plane on the X-ray elastic constant were studied.
The results obtained were summarized as follows:
(1) The diffraction from the (2. 1. 10) plane yielded higher accuracy in the X-ray stress measurement of sintered alumina than that from the (1 4 6) plane, because of its high intensity, isolation of the diffraction profile, and low magnitude of the stress constant.
(2) The X-ray value of the elastic constant, E/(1+ν)(E=Young's modulus, ν=Poisson's ratio), as well as the mechanical value, became smaller with decreasing purity or bulk density. The ratio of the X-ray elastic constant to the mechanical value did not vary with bulk density for the both diffraction planes.
(3) A simple method to estimate the X-ray elastic constant of sintered alumina with arbitrary bulk density was proposed on the basis of the Reuss-model analysis of alumina polycrystals.
