Study of dislocation walls evolution during spall in pure aluminum

B. Glam, D. Moreno, S. Eliezer, D. Eliezer

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The micro-structure of the spall plane of pure aluminum (99.9999%) was investigated in symmetric plate impact experiments. The aluminum targets were first heated at 450°C for 22 h for grain growth. The impacted targets were softly caught and collected for metallurgical analysis. It was found that at weak impacts with partial spall, voids with average size of 50±10 μm were developed along the grain boundaries. The grain sizes in the vicinity of the voids are 50-250 μm, in comparison with grain sizes of 400-1000 μm in other areas of the specimen, revealing grains splitting under dynamic tension. Transmission Electron Microscopy (TEM) and electron diffraction show parallel dislocation walls, that create a sub-grain micro-structure inside grains with (011) orientation to the beam. In grains with other orientations no dislocation walls or sub-grain structure were found. We also found out pile up of the dislocations by glide mechanism along <011> directions during the spall process.

Original languageEnglish
Title of host publicationShock Compression of Condensed Matter - 2011 - Proceedings of the Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter
Pages987-990
Number of pages4
DOIs
StatePublished - 13 Jun 2012
Event17th Biennial Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 2011 APS SCCM - Chicago, IL, United States
Duration: 26 Jun 20111 Jul 2011

Publication series

NameAIP Conference Proceedings
Volume1426
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference17th Biennial Conference of the American Physical Society Topical Group on Shock Compression of Condensed Matter, 2011 APS SCCM
Country/TerritoryUnited States
CityChicago, IL
Period26/06/111/07/11

Keywords

  • aluminum
  • dislocation wall
  • high strain rate
  • pile up
  • spall

ASJC Scopus subject areas

  • General Physics and Astronomy

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