Ni-Cr-Al合金のセル状析出に及ぼす添加元素の影響

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A Ni-38 mass% Cr-3.8 mass% Al alloy possesses higher hardness and tensile strength than conventional Ni-base alloys. Such excellent properties are attributed to the discontinuous or cellular precipitation of the Cr-rich solid-solution (α) phase with the body-centered cubic (bcc) structure combined with the continuous precipitation of the Ni3Al (γ’) phase with the L12 structure from the Ni-rich solid-solution (γ) phase with the face-centered cubic (fcc) structure. Due to the cellular precipitation, the untransformed matrix of the γ phase is transformed into the cell consisting of the γ and α lamellae dispersed with fine γ’ particles. Since the growth of the cell is controlled by the boundary diffusion along the moving boundary between the cell and the untransformed matrix, it occurs rather fast. In such a case, it is not easy to realize the uniformly transformed cell over the whole area of the alloy with a large size. In order to find the alloying element inhibiting the growth of the cell, the influence of Mo, W and Fe on the kinetics of the cellular precipitation was experimentally observed using Ni-Cr-Al alloys with 35-36 mass% Cr and 3.8 mass% Al containing 1-2 mass% Mo, 1-2 mass% W or 5 mass% Fe. According to the observation, the overall growth of the cell is decelerated by Mo and W, but accelerated by Fe. Furthermore, the influence is more remarkable for Mo than for W. Thus, Mo is one of the most effective alloying elements suppressing the growth of the cell.
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Ni-Cr-Al合金のセル状析出に及ぼす添加元素の影響

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