Accession Number : AD0699250

Title :   ENERGY CHARACTERISTICS OF DELAYED RUPTURE OF TITANIUM ALLOYS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Meshcheryakov,V. N. ; Shorshorov,M. Kh.

Report Date : 30 SEP 1969

Pagination or Media Count : 23

Abstract : The calculation of the activation energy in the process of delayed rupture of high-strength titanium alloys showed the validity of using the hypothesis about the essential role of vacancies in the formation of nuclei of cracks along grain boundaries previously based on the analysis of the process of delayed rupture of work hardened steel. In the case of plastic alloys of titanium the calculated data of activation energy according to curves of temporary dependence of strength indicate the development of strain aging in the process of testing in a specific interval of stresses low in value. The calculation of the activation energy of these alloys according to the rate of steady-state creep gives smaller values of energy than according to temporary dependences of strength. This is caused by the fact that during the accretion of deformation during creep all three stages of creep contribute in the process of testing for delayed rupture. The calculation of activation energy of plastic alloys of titanium, alloyed with 2.5 percent zirconium indicate that strain aging in those alloys is suppressed at an oxygen content up to 0.25 percent and develop noticeably at an oxygen content of 0.42 percent. (Author)

Descriptors :   (*TITANIUM ALLOYS, RUPTURE), HEAT OF ACTIVATION, CRACK PROPAGATION, CRACKS, WELDING, USSR

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE