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

DOI: 10.1016/j.msea.2014.05.044 DOI Help

Authors: Hui-Yu Yan (Imperial College London) , James Coakley (Imperial College London) , Vassili A. Vorontsov (Imperial College London) , Nicholas G. Jones (University of Cambridge) , David Dye (Imperial College London) , Howard J. Stone (University of Cambridge)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Materials Science And Engineering: A , VOL Volume 613, 8 September 2014, , PAGES Pages 201–208

State: Published (Approved)
Published: May 2014

Open Access Open Access

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 ???? phase is less stiff than the ? matrix in all orientations, which means that load shedding will occur to the ? phase.

Journal Keywords: Co-Al-W Superalloys; Synchrotron X-Ray Diffraction; Neutron Scattering; Elastic Behaviour

Diamond Keywords: Alloys

Subject Areas: Materials, Engineering

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Other Facilities: Also used neutron diffraction data from ISIS & SNS

Added On: 09/07/2014 16:11


Discipline Tags:

Materials Engineering & Processes Materials Science Engineering & Technology Metallurgy

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