Shock wave determination of the strengthening of commercial aluminum alloy 6061 by point defects

E. B. Zaretsky, N. Frage, S. Kalabukhov

Research output: Contribution to journalArticlepeer-review

Abstract

The strengthening of aluminum alloy 6061 (AA6061) by different point defects was determined experimentally using a shock wave technique. Decay of the amplitude of elastic precursor wave τel with propagation distance h was studied in four groups of AA6061 samples, namely, that in the super-saturated solid solution state (SSSS), and those strengthened by atomic clusters (short-range order), by Guinier-Preston zones I and by Guinier-Preston zones II after, respectively 7.5, 240 and 960 min aging of the SSSS samples at 145 °C. The dependences τel(h) were found to be kinked at stress τ*, corresponding to the transition of the control of dislocation motion from phonon viscous drag at τel* to thermally activated obstacle passage at τel*. The values of strengthening by atomic clusters, GP-I, and GP-II zones were found equal to τsro=67, τGP-I=67, and τGP-II=124MPa, respectively. Activation volumes corresponding to the interaction of dislocations with the studied defects, estimated based on τel* segments of the measured dependences τel(h), were found to be in reasonable agreement with existing concepts of dislocation/defect interactions.

Original languageAmerican English
Article number138066
JournalMaterials Science and Engineering: A
Volume761
DOIs
StatePublished - 22 Jul 2019

Keywords

  • Control of dislocation motion
  • Elastic precursor decay
  • Point defects in aluminum alloy 6061

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • General Materials Science

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