NEW X-RAY TUBE FOR INTERNAL STRUCTURE ANALYSIS AND ITS APPLICATION

Abstract

The author constructed a new X-ray tube which is very convenient to take DebyeScherrer photographs of large angle of reflection. It is an electron. tube made from brass and its anticathode is a flat copper or iron block and X-rays are reflected by the specimen, which is set as close as to the window of the X-ray tube, and travels through the back side of the anticathode and reach to the photographic plate. As the distance between the sourse of the X-ray beam and the specimen is only about 2 cms, we can take a photograph within a few minutes.
With this new X-ray tube, the author investigated the age-hardening of duralumin and obtained the following results: (a) the lattice constant of duralumin becomes large when it was quenched and aged at room temperature and its amount finally reaches to 0.040%. The increase of the hardness number is almost parallel to the dilatation of the lattice, (b) in the artificial aging at 100°, the lattice contracts and, at the final state, the contraction reaches to 0.210% and, the change of the lattice is also parallel to the increase of the hardness number.
The author also studied the concentration of Sn in the dendrite of the cast broze containing 5.5 % Sn. Its Debye-Scherrer photographs show (a) the maximum of the intensity corresponds to 3.9% Sn, (b) between 3.9% Sn and 15% Sn, there exists no maximum and the intensity is almost uniform showing uniform. distirbution of each compositions and (c) when it is annealed the change of the breadth of the band spectrum appears at about 500° and at 800° the breadth becomes almost equal to that of pure Cn