발간논문

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Vol.25, No.10, 739 ~ 749, 1987
Title
Effect of Cu on Precipitation Hardening in Fe - Ni - Al alloy
손유홍Y . H . Shon, 조현기H . K . Cho
Abstract
A detailed examination was carried out to clarify the effect of Cu on precipitation hardening of Fe-Ni-Al alloy by varying the amount of Cu and measuring the yield strength, hardness, and electric resistivity. Electolytically extracted residue was also analysed by transmission electron microscope. The absolute strength of Fe-XCu-3Ni-1Al alloy after aging at 500℃ increased and rapidly reached maximum strength with increasing Cu wt.% due to the increased Ni Al phase precipitated at intragranula. Intergranular precipitation of ε-Cu during aging increased with increasing Cu wt.% in Fe-XCu-3Ni-1Al alloy. It was found that ε-Cu precipitation promoted precipitation of the Ni Al phase by in-situ nucleation. The major strengthening mechanism during aging at 500℃ in Fe-XCu-3Ni-1Al alloy was attributed to the fine Ni Al-precipitates coherent with the ferrite matrix.
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