Effect of nickel powder particle size on the microstructure and thermophysical properties of spark plasma sintered NiCrCoAlTiW-Ta superalloy

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Contributor list: Ogunbiyi FO, Jamiru T, Sadiku ER, Adesina OT, Salifu SA, Beneke LW

Publication year: 2019


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Abstract

The spark plasma sintering technique (SPS) was used to consolidate admixed elemental

powder in order to fabricate NiCrCoAlTiW-Ta superalloy. Nickel which is the key element that

formed the matrix powder particle size was varied in the range of 3-44, 45-106 and 106-150 μm.

The effect of varying the starting powder particle size, on the formation of intermetallic phases was

investigated. Also, important thermophysical properties in the development of superalloys for high

temperature applications were investigated by using laser flash machine, in the range of 100-800 .

The constituents of the microstructure for the sintered alloy includes, the gamma () matrix phase

(Ni), precipitated intermetallic gamma prime ( !) phase Ni3(Al, Ti) and the precipitated solid

solution strengthening elements (Cr and W). There was an increase in the density with decreasing

powder particle size. Also, the averave grain size increased with increasing powder particle size.

The thermophysical properties obtained, which include thermal conductivity and diffusivity increase

with increasing temperature. Non-linear behaviour and inflection points were observed as the

temperature increases due to short range order and disorder phenomenon which is associated with

superalloys. The powder particle size has little or no significant effect of the thermophysical

behaviour as the pattern observed were almost the same.


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