Impact response and dislocation substructure of Ti-6Al-4V alloy at cryogenic temperatures

Woei Shyan Lee, Tao Hsing Chen, Sian Cing Huang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The aim of this study is to investigate impact response and dislocation substructure of Ti-6Al-4V alloy using a compressive split-Hopkinson pressure bar and transmission electron microscopy technique. Cylindrical specimens are deformed at strain rates ranging from 8×10 2 s -1 to 4.0×10 3 s -1 and temperatures of 0°C and -200°C respectively. It is shown that the impact properties of Ti-6Al-4V alloy depend strongly on strain rate and temperature. For a constant temperature, the flow stress and strain rate sensitivity increase with increasing strain rate, while the activation volume decreases. Meanwhile, for a constant strain rate, the activation volume increases with increasing temperature, while the flow stress and strain rate sensitivity decrease. Transmission electron microscopy (TEM) observations show that the dislocation density increases with an increasing strain rate, but decreases with an increasing temperature. The mechanical properties of the impacted specimens are related to the microstructural evolution.

Original languageEnglish
Title of host publicationTMS 2012 - 141st Annual Meeting and Exhibition, Supplemental Proceedings
Pages457-463
Number of pages7
Publication statusPublished - 2012 May 14
Event141st Annual Meeting and Exhibition, TMS 2012 - Orlando, FL, United States
Duration: 2012 Mar 112012 Mar 15

Publication series

NameTMS Annual Meeting
Volume2

Other

Other141st Annual Meeting and Exhibition, TMS 2012
CountryUnited States
CityOrlando, FL
Period12-03-1112-03-15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Impact response and dislocation substructure of Ti-6Al-4V alloy at cryogenic temperatures'. Together they form a unique fingerprint.

  • Cite this

    Lee, W. S., Chen, T. H., & Huang, S. C. (2012). Impact response and dislocation substructure of Ti-6Al-4V alloy at cryogenic temperatures. In TMS 2012 - 141st Annual Meeting and Exhibition, Supplemental Proceedings (pp. 457-463). (TMS Annual Meeting; Vol. 2).