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Diffusion couple 을 이용한 Ni3Al 의 상평형 연구
이찬규,이재현,유창종,조창용,김현철 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.6
Three solid phases are involved in the phase equilibria of the important intermetallic compound Ni₃Al near its melting point, β, γ' (Ni₃Al) and γ. The generally-accepted phase diagram involves a eutectic reaction between γ' and γ, but some recent studies agree with an older diagram due to Schramm, which has a eutectic reaction between the β and γ' phases. This study uses diffusion couple experiments to evaluate the equilibria at temperatures just below the liquidus. The Ni/NiAl diffusion couples were prepared at 1249, 1340, 1355, 1365℃. where the γ' phase formed between β and γ after diffusion heat treatment. The formation of the γ' layer was found to be controlled by volume diffusion. The composition range of the γ' phase with increasing temperatures were increased to the higher Ni composition, which agrees with the Schramm diagram. The interdiffusion coefficient in the γ and β phases has been also determined from the composition profiles of the diffusion couples.