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Arhive, 2003, № 2

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Thermophysical Properties of Materials

2003. V. 41. № 2. P. 221–228

Chekhovskoi V.Ya., Peletskii V.E.

Thermophysical properties of

$75\mathrm{Ni}$ –

$15\mathrm{Mo}$ –

$10\mathrm{Re}$ alloy

Annotation

The true heat capacity, thermal expansion, thermal conductivity, electrical resistance, and density of NMR-75 alloy (

$75$ wt

$\%\mathrm{Ni}$ ,

$15$ wt

$\%\mathrm{Mo}$ , and

$10$ wt

$\%\mathrm{Re}$ ) are investigated in a temperature range of

$300$ –

$1300$ K. The enthalpy, mean coefficient of thermal expansion, thermal diffusivity, and Lorentz number are calculated from the obtained experimental data. The measurement results show that a reversible structural transformation occurs in the alloy in a temperature range of

$750$ –

$960$ K. In accordance with the phase diagram, the ternary system of the alloy consists of an

$\alpha$ -solid molybdenum–nickel solution, which is in equilibrium with a

$\beta$ -solid rhenium–nickel solution and a

$\mathrm{Ni}_4\mathrm{Mo}$ intermetallic compound. On heating the alloy in a temperature range of

$750$ –

$960$ K, the intermetallic compound transforms into the

$\alpha$ -solid molybdenum–nickel solution with the absorption of heat, while the ordered structure transforms into a disordered one. The thermal effect

$\mathcal{Q}=6$ kJ/kg and the activation energy of alloy disordering

$E=2.2$ eV are estimated. The transformation proper is regarded as a second-order transition.

DOI: 10.1023/A:1023329802436

Article reference:
Chekhovskoi V.Ya., Peletskii V.E. Thermophysical properties of

$75\mathrm{Ni}$ –

$15\mathrm{Mo}$ –

$10\mathrm{Re}$ alloy, High Temp., 2003. V. 41. № 2. P. 221

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