The microstructure and hardness of Ni-Co-Al-Ti-Cr quinary alloys

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[1] Christofidou, K.A.
[2] Jones, N.G.
[3] 1,Pickering, E.J.
[4] Flacau, R.
[5] Hardy, M.C.
[6] Stone, H.J.
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Christofidou, K.A. (kc424@cam.ac.uk) | 1600年 / Elsevier Ltd卷 / 688期
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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 γ-γ′ 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 γ and γ′ 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 γ-γ′ alloys of this type. © 2016 Elsevier B.V;
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