[논문]Precipitation hardening of Ni-12.19 at.% Al alloy single crystals

Munjal, V.; Ardell, A.J.

doi:10.1016/0001-6160(75)90091-7

[해외논문] Precipitation hardening of Ni-12.19 at.% Al alloy single crystals
Verfestigung durch Ausscheidungen in Ni-12,19 AT.% Al-einkristallen

Acta metallurgica, v.23 no.4, 1975년, pp.513 - 520

Munjal, V. , Ardell, A.J.

Abstract ▼ AI-Helper

Single crystal specimens of a Ni-12.19 at.% Al alloy were aged for various times at 625oC and mechanically tested in compression at 77, 191, 297 and 373oK. After subtracting the contribution of solid-solution strengthening from the measured values of the CRSS, the incremental increase in the CRSS, Δτ, due to the γ' precipitates was analyzed according to the theory of order strengthening. The quantitative agreement between the experimentally determined and theoretically calculated values was excellent, agreeing to within 15 per cent over the range of average γ' particle sizes, 2, where Δτ is proportional to (2)12. Calculations of other possible hardening mechanisms show that the contributions from interface creation and elastic constant differences are very small in this Ni-Al alloy. However, the contribution of coherency hardening in this alloy is calculated to be roughly equivalent in magnitude to that due to order strengthening, and very strongly temperature dependent. Since the measured values of Δτ were nearly temperature independent, we conclude that the contribution of coherency hardening is negligible.

Abstract

Einkristalline Ni-12,19 at.% Al-Proben wurden verschieden lang bei 625oC getempert und bei 77, 191, 297 und 373 K im Druckversuch verformt. Nach Abzug des Anteils der Legierungsverfestigung von drei gemessenen CRSS-Werten wird der Beitrag δτ zur CRSS, der von den γ'-Ausscheidungen herruhrt, anhand der Theorie der Ordnungsverfestigung analysiert. Die quantitativen Abweichungen zwischen experimentell gemessenen und theoretisch berechneten Werten sind kleiner als 15% im Bereich mittlerer γ'-Teilchengroβen 2, wobei Δτ proportional zu (2)12 ist. Berechnungen anderer moglicher Verfestigungsmechanismen zeigen, daβ die Beitrage aus Grenzflachenerzeugung und aus unterschiedlichen elastischen Konstanten in dieser Ni-Al-Legierung sehr klein sind. Der Anteil der Koharenz-Verfestigung ist in dieser Legierung etwa gleich groβ wie jener der Ordnungs-Verfestigung und er ist temperatur abhangig. Aus der Tatsache, daβ die gemessenen Δτ-Werte nahezu temperaturunabhangig sind, wird geschlossen, daβ der Beitrag der Koharenz-Verfestigung vernachlassigbar ist.

Abstract

Des echantillons monocristallins d'un alliage Ni-12,19 at.% Al vieillis a 625oC pendant des durees diverses, ont ete deformes en compression a 77, 191, 297, et 373 K. Apres avoir retranche la contribution du durcissement de solution solide des valeurs mesurees de la cission reduit critique, on a analyse l'accroissement de la CRC Δτ, du aux precipites γ' dans le cadre de la theorie du durcissement par mise en ordre. L'accord quantitatif entre les valeurs experimentales et les valeurs theoriques est excellent, puisque l'ecart est inferieur a 15 pour cent pour toutes les tailles moyennes de particules γ', 2, pour lesquelles Δτ est proportionnelle a (2)12. Le calcul des autres mecanismes possibles de durcissement montre que les contribution dues a la creation d'interfaces et a des differences de constantes elastiques sont tres faibles dans cet alliage. Cependant, on a calcule que la contribution du durcissement par coherence est du meme ordre de grandeur que celle du durcissement par ordre et qu'elle depend fortement de la temperature. Comme les valeurs de Δτ mesurees sont pratiquement independantes de la temperature, nous concluons que la contribution du durcissement par coherence est negligeable.

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[해외논문] Precipitation hardening of Ni-12.19 at.% Al alloy single crystals
Verfestigung durch Ausscheidungen in Ni-12,19 AT.% Al-einkristallen

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[해외논문] Precipitation hardening of Ni-12.19 at.% Al alloy single crystals Verfestigung durch Ausscheidungen in Ni-12,19 AT.% Al-einkristallen

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[해외논문] Precipitation hardening of Ni-12.19 at.% Al alloy single crystals
Verfestigung durch Ausscheidungen in Ni-12,19 AT.% Al-einkristallen