抄録
The X-ray stress analysis was examined for an arc-melted Ni3Al intermetallic compound, which consists of coarse grains and exhibits strongly preferred orientation. The imaging plate was used as an X-ray detector, and continuous Debye-Scherrer rings were obtained from such coarse grained material by applying an X-Y plane oscillation method. Mechanical bending stress was applied to the specimen for measuring the X-ray elastic constants and stress constant. An ideal orientation method was adopted to obtain these parameters. It uses the diffraction lines which belong to the same zone axis. These experimental elastic constants were compared with the theoretical values calculated from the elastic compliance of Ni3Al single crystal.
The results obtained are summarized as follows;
(1) The X-ray elastic constants measured from Ni3Al 220 diffractions which appeared at ψ=0.537° and 60.537°, were EX/(1+νX)=176GPa, EX=220GPa and νX=0.253.
(2) The theoretical Young's modulus E0 at ψ=0° was calculated as 207GPa from the elastic compliance of Ni3Al single crystal. This value means the elastic constant in the direction of the tensile axis for the grains which contribute to the diffraction. Young's modulus E60 at ψ=60° was similarly obtained as 228GPa. The experimental value of X-ray elastic constant EX (220GPa) was intermediate between the theoretical values.
