Accession Number : AD0673407

Title :   METASTABLE PHASES IN ALLOYS OF TITANIUM, THE MECHANISM AND KINETICS OF THEIR FORMATION (METASTABILNYE FAZY V SPLAVAKH TITANA, MEKHANIZM I KINETIKA IKH OBRAZOVANIYA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Fedotov,S. G.

Report Date : 13 OCT 1967

Pagination or Media Count : 50

Abstract : A short review is given with 56 references followed by the author's expts. for detg. Young's and shear moduli, as well as Poisson coeffs. in quenched and annealed alloys of the following systems: Ti-Mo, Ti-V, Ti-Nb, Ti-Mo-V, Ti-V-Nb, and Ti-Mo-V-Nb. Elastic properties of alpha-Ti are twice those of beta-Ti. With annealed specimens the alloying ingredients lowered elastic properties of alpha-Ti, the more lowered were the elastic properties of the resp. alloys; the alloying elements can be put in the following order of decreasing effect on the elastic properties of Ti alloys: Mo-V-Nb. With quenched specimens and alpha-Ti or alpha + beta Ti, the alloying ingredients lowered initially the elastic properties sharply and afterwards restored their level jumpwise or even increased the level to a new max. value. Afterwards there was again a drop, followed by a slow increase. One-phase beta-Ti alloys did not show any difference in behavior of annealed and quenched specimens. Mechanisms and kinetics of martensitic beta - alpha transformation is discussed and described as taking place in 2 stages: (1) spontaneous dislocation of sep. Ti atoms into a new mech. more stable position (caused by lessened elastic stability of the initial beta-lattice); (2) either another jumpwise dislocation of Ti atoms or equilibration of dislocation forces with the rigidity of the metal at low temps. (300-500). (Author)

Descriptors :   (*TITANIUM ALLOYS, USSR), PHASE STUDIES, MODULUS OF ELASTICITY, QUENCHING, VANADIUM ALLOYS, MOLYBDENUM ALLOYS, NIOBIUM ALLOYS, STABILITY, MARTENSITE, ANNEALING, DISLOCATIONS, CHROMIUM ALLOYS, MANGANESE ALLOYS, ZIRCONIUM ALLOYS, KINETIC ENERGY

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE