Local-electrode atom-probe tomographic investigation of strengthening precipitates in A Mg-7Zv-3Al alloy at peak hardness

Shengjun Zhang*, Gregory B Olson

*Corresponding author for this work

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

Abstract

The precipitates in the Mg-7Zn-3Al (in wt.%) alloy aged to peak hardness at 150°C have been characterized by local-electrode atom-probe (LEAP) tomography. The chemical compositions of the matrix and the precipitates were measured and compared with the results calculated using the COST2 database by the Thermo-Calc software. Ternary nanoscale precipitates have been found consistent with the predicted φ phase demonstrating a metastable composition. The measured particle size at peak hardness, corresponding to an equivalent sphere radius of 17 nm, provides an important calibration point for quantitative modeling of precipitation strengthening for alloy design. The interfacial energy is also determined based on the capillarity effect.

Original languageEnglish (US)
Title of host publicationMagnesium Technology 2008
Pages113-116
Number of pages4
StatePublished - Jun 30 2008
EventMagnesium Technology 2008 - New Orleans, LA, United States
Duration: Mar 9 2008Mar 13 2008

Other

OtherMagnesium Technology 2008
CountryUnited States
CityNew Orleans, LA
Period3/9/083/13/08

Keywords

  • LEAP tomography
  • Mg alloys
  • Precipitation strengthening

ASJC Scopus subject areas

  • Engineering(all)

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