Title: Thermophysical properties of Ni-based Waspaloy alloy changed with tungsten, titanium and aluminium

Authors: Daeho Kim; Woosang Jung; Sanghyun Lee

Addresses: Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, South Korea ' Center for Energy Materials Research, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, South Korea ' Division of Physical Metrology, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 34113, South Korea

Abstract: We reported new experimental results of thermophysical properties of nickel-based Waspaloy alloy such as the thermal diffusivity, specific heat capacity, and thermal conductivity in a temperature range from 25°C to 800°C by using laser flash and DSC(Differential Scanning Calorimeter). The Waspaloy series in experiments was basically prepared with the same chemical composition as commercial model. The amount of tungsten composition of strengthened alloy was adjusted from (0~8) wt.% for WA-LW and WA-HW specimens. The composition of forming the precipitation of gamma-prime (γ´: Ni3Ti, Ni3Al) of titanium and aluminium was adjusted (2.3~3.0) wt.% and (1.4~1.8) wt.%, respectively for WA1 and WA2 specimens. The thermal conductivity values of added tungsten composition were decreased due to the distortion of ordered face-centred cubic (FCC) structure and phonon scattering. The experimental values of thermal properties of WA1 and WA2 also showed the effect of changed composition of titanium and aluminium. The results of Waspaloy series were shown with each data and relative deviation plot vs. basic composition of Waspaloy alloy. Specific heat capacity of Waspaloy series was compared from the continuous data plot. In conclusion, the results of thermophysical physical properties of Waspaloy series can be very useful in thermal design, thermodynamic simulation, and the analysis of heat treatment in high temperature.

Keywords: Waspaloy alloy; thermal diffusivity; specific heat capacity; thermal conductivity; laser flash; DSC; differential scanning calorimeter.

DOI: 10.1504/IJNT.2022.122362

International Journal of Nanotechnology, 2022 Vol.19 No.1, pp.13 - 20

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 16 Apr 2022 *

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