Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 688, Issue -, Pages 542-552Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.07.159
Keywords
High-temperature alloys; Metals and alloys; Microstructure; Neutron diffraction; Metallography
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Funding
- Rolls-Royce/EPSRC [EP/H022309/1, EP/H500375/1, EP/M005607/1]
- EPSRC [EP/M005607/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/M005607/1, 1147795] Funding Source: researchfish
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The effects of Ni:Co and Al:Ti ratios on the room temperature microstructure, hardness and lattice parameter of twenty-seven quinary Ni-Co-Al-Ti-Cr alloys have been evaluated. All of the alloys exhibited a uniform gamma-gamma' microstructure. Differential scanning calorimetry (DSC) showed that the liquidus and solidus temperatures of the alloys increased with greater Al: Ti ratios, decreased with Cr concentration and remained largely unchanged with respect to the Ni:Co ratio. Neutron diffraction measurements of the gamma and gamma' lattice parameters revealed that the lattice misfit in all of the alloys was positive and increased with Ti concentration (i.e. lower Al:Ti ratio) regardless of the concentration of Cr, or the ratio of Ni: Co. Importantly, alloys with a Ni:Co ratio of 1:1, were found to have consistently greater lattice misfits than alloys with Ni:Co ratios of either 1:3 or 3:1. The measured lattice misfits were found to be strongly correlated with the Vickers hardness of the alloys, suggesting that lattice misfit plays a key role in the strengthening of gamma-gamma' alloys of this type. (C) 2016 Elsevier B.V. All rights reserved.
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