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γ′ particle coarsening and yield in Alloy 800

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Abstract

The age strengthening of Alloy 800 by ordered particles ofγ′-Ni3(Al, Ti) phase has been studied by using both transmission electron microscopy and room-temperature tensile tests on aged specimens. The samples have been aged in the temperature range 525 to 650° C up to a maximum time of 104 h. Two groups of samples with different Ti/Al ratios have been investigated in order to obtain more reliable information on the role played by these alloying elements on the age-hardening behaviour. Theγ′ linear dimension increases with time,t, ast 1/3 and an activation energy of 70.0 kcal mol−1 was derived from the temperature dependence of the coarsening rate. The particle volume-fraction, as measured by electron microscopy, has been found to remain constant on ageing in the temperature range 525 to 600° C. The increase in the critical shear stress due to theγ′ particles is found to agree quantitatively with the equations of Brown and Ham which describe hardening by ordered particles. Antiphase boundary energies of 227 and 279 mJ m−2 have been measured, respectively, for the two groups of samples investigated.

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  1. Laboratorio Caratterizzazione Materiali CNEN, CSN Casaccia, CP 2400, Rome, Italy

    M. Vittori

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  1. M. Vittori
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Vittori, M. γ′ particle coarsening and yield in Alloy 800. J Mater Sci 16, 3461–3469 (1981). https://doi.org/10.1007/BF00586309

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