METASTABLE PHASES IN ALLOYS OF TITANIUM, THE MECHANISM AND KINETICS OF THEIR FORMATION (METASTABILNYE FAZY V SPLAVAKH TITANA, MEKHANIZM I KINETIKA IKH OBRAZOVANIYA),
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 13, 1967
- Accession Number
- AD0673407
Entities
People
- S. G. Fedotov
Organizations
- National Air and Space Intelligence Center