Alloying and the micromechanics of Co-Al-W-X quaternary alloys

Hui-Yu Yan, James Coakley, Vassili A. Vorontsov, Nicholas G. Jones, Howard J. Stone, David Dye*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)
32 Downloads (Pure)

Abstract

The lattice misfit and diffraction elastic constants in hot rolled polycrystalline Co-7Al-5W-2Ta and Co-6Al-6W-2Ti (at.%) are measured using neutron and synchrotron X-ray diffraction. The misfit in the two alloys was found to be +0.67 and +0.59%, using neutron diffraction at HRPD. The misfit was found to increase with temperature, as in Ni superalloys. This implies that the amount of coherency strengthening increases with temperature. The diffraction elastic constants measured show that the γ ' phase is less stiff than the γ matrix in all orientations, which means that load shedding will occur to the γ phase.

Original languageEnglish
Pages (from-to)201-208
Number of pages8
JournalMaterials Science and Engineering A
Volume613
Early online date22 May 2014
DOIs
Publication statusPublished - 8 Sept 2014

Funding

The authors would like to acknowledge the financial support provided by Rolls-Royce plc and EPSRC (UK) under the DHPA scheme (HY) and by Grants EP/H004882/1 (DD, NGJ, JC, VAV) and EP/H500375/1 (HJS, NGJ). Useful conversations with Mark Hardy at Rolls-Royce plc. are also acknowledged, as is the provision of beamtime by STFC (UK) at Diamond and ISIS and at SNS, ORNL by the Scientific User Facilities Division, Office of Basic Energy Sciences, Department of Energy (USA).

Keywords

  • Co-Al-W superalloys
  • elastic behaviour
  • neutron scattering
  • synchrotron X-ray diffraction

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