Accession Number : AD1036003


Title :   Microstructure Evolution and Mechanical Behavior of Ultrafine Ti-6Al-4V During Low Temperature Superplastic Deformation (Postprint)


Descriptive Note : Journal Article


Corporate Author : AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH WRIGHT-PATTERSON AFB United States


Personal Author(s) : Zherebtsov,S V ; Kudryavtsev,E A ; Salishchev,G A ; Straumal,B B ; Semiatin,S L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1036003.pdf


Report Date : 13 Sep 2016


Pagination or Media Count : 15


Abstract : The influence of microstructure evolution on the low-temperature superplasticity of ultrafine Ti6Al4V was established. For this purpose, the static and dynamic coarsening response and plastic-flow behavior of the alloy with a mean size of (sub) grains and particles of 0.10.4 m were determined via a series of tension tests at temperatures between 450 and 700 C. Both static and dynamic coarsening exhibited diffusion-controlled (r3-vs-time) kinetics. However, dynamic coarsening was approximately two orders of magnitude faster than the corresponding static behaviors due to enhanced diffusion through the deformed matrix. A total elongation of 1000 and strain-rate-sensitivity exponent m = 0.48 were obtained at 550 C and 2 104 s1. Very limited cavitation was observed in the specimens after superplastic deformation under optimal conditions.


Descriptors :   titanium alloys , low temperature , SUPERPLASTICITY


Subject Categories : Metallurgy and Metallography
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE