Accession Number : AD0012039


Title :   THE BENDING OF MOLYBDENUM SINGLE CRYSTALS


Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD


Personal Author(s) : AUST, K T ; MADDIN, R ; CHEN, N K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/012039.pdf


Report Date : May 1953


Pagination or Media Count : 24


Abstract : Eight single-crystal specimens of 1/8- to 1/10-in. diameter were grown from sintered Mo rods. The specimens were 7-in. long with single crystals of about 1- to 2-in. lengths occupying the center section. They were electrolytically polished and loaded in a bending apparatus. The load and deflection were measured by strain indicators. X-ray back-reflection Laue photograms of the same position on each specimen were taken before bending, and at successive stages during the bending. The 8 specimens were bent through final angles of 13 deg, 10 deg, 16 deg, 10 deg, 16 deg, 11 deg, 12 deg, and 15 deg, respectively. Lattice rotation during the bending occurred toward the (110) pole on the compression side and toward the 111 direction on the tension side. Crystallite and lattice rotation indicated that (1) slip planes are of the type (110) and (2) the slip directions are of the type 111 for Mo single crystals which deform at room temperature. The orientation changes on the compression and tension sides of a single crystal during bending were similar to those of 2 separate crystals deforming under compression and tension loading, respectively. Laue reflections generally revealed a breakup which indicated a crystallite fragmentation. With several assumptions, the resolved shear stress in bending was calculated to be about 5000 psi.


Descriptors :   *COMPRESSION , DEFLECTION , ORIENTATION(DIRECTION) , SINGLE CRYSTALS , SIDES , BENDING , ROOM TEMPERATURE , SHEAR STRESSES , TENSION , RODS , ANGLES , CRYSTALS


Subject Categories : Fluid Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE