Quantitative in situ X-ray powder diffraction studies of phase transformations in Al alloys

Mark J. Styles, Mark A. Gibson, Christopher R. Hutchinson

Research output: Contribution to conferenceAbstract


In situ synchrotron X-ray powder diffraction is a powerful tool for
studying phase transformations in engineering alloys, which, when
combined with Rietveld-based data analysis methods, allows the phase
composition of an alloy to be quantified as a function of variables such
as time or temperature. This approach has recently been used to gain
new insights into phase transitions within two Al alloy systems. In
situ isothermal aging experiments have confirmed that the
decomposition sequence in Al-Cu-Mg alloys involves a metastable
variant of the S (Al2CuMg) phase, and enabled the kinetics of the
transformation between metastable and equilibrium S phases to be
investigated. In addition, continuous heating experiments have been
used to investigate crystallisation pathways in Al-Ni-Y metallic glasses,
and have revealed that the mechanism switches from a two stage
process involving α-Al, to a three stage process involving Al9Ni2 and a
transient excess of Al3Ni, with increasing Ni concentration.
Original languageEnglish
Number of pages2
Publication statusPublished - 2015
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM) 2015 - Westin Whistler Resort & Spa, Whistler, Canada
Duration: 28 Jun 20153 Jul 2015


ConferenceInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials (PTM) 2015
Abbreviated titlePTM 2015
Internet address


  • Al alloys
  • Precipitation
  • Rietveld analysis
  • X-ray powder diffraction

Cite this