Nimonic 75 (UNS No6075)

 Nimonic 75 (N06075)nickel-based alloy is a nickel-chromium alloy with extremely low titanium and iron content and excellent high temperature performance. The alloy is added with elements (chromium, tungsten, molybdenum, etc.) different from the atomic size of the base metal to cause the distortion of the matrix metal lattice, and the addition of elements (such as cobalt) that can reduce the stacking fault energy of the alloy matrix and the addition of elements that can slow down the diffusion of matrix elements rate elements (tungsten, molybdenum, etc.) to strengthen the matrix.

Precipitation strengthening:

Nimonic 75 precipitates the second phase (γ’, γ”, carbide, etc.) from the supersaturated solid solution through aging treatment to strengthen the alloy. The array constant is close to the matrix and coherent with the crystal, so the γ phase can be uniformly precipitated in the matrix in the form of fine particles, which hinders the movement of dislocations and produces a significant strengthening effect. The γ’ phase is an A3B type intermetallic compound, A represents Nickel, cobalt, B represents aluminum, titanium, niobium, tantalum, vanadium, tungsten, and chromium, molybdenum, iron can be either A or B. The typical γ’ phase in nickel-based alloys is Ni3 (Al, Ti). The strengthening effect of the γ’ phase can be enhanced by:

(1), increase the number of γ’ phases;

(2) Make the γ’ phase and the matrix have a suitable degree of mismatch to obtain the strengthening effect of coherent distortion;

(3) Add elements such as niobium and tantalum to increase the anti-phase boundary energy of the γ’ phase to improve its ability to resist dislocation cutting;

(4) adding cobalt, tungsten, molybdenum and other elements to improve the strength of the γ’ phase. The γ” phase has a body-centered tetragonal structure, and its composition is Ni3Nb. Due to the large mismatch between the γ” phase and the matrix, it can cause a large degree of coherence distortion, so that the alloy obtains a high yield strength. But over 700 ℃, the strengthening effect will be significantly reduced. Cobalt-based superalloys generally do not contain gamma phase, but are strengthened with carbides.

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