High-Temperature Structural Stabilities of Ni-Based Single-Crystal Superalloys Ni–Co–Cr–Mo–W–Al–Ti–Ta with Varying Co Contents

Composition rules of Ni-base single crystal superalloys and its influence on creep properties via a cluster formula approach

“…Therefore, all the series, series, and series of elements should be tuned simultaneously to balance the HT mechanical property and the oxidation/corrosion resistances. Consequently, the optimum comprehensive property will reach at the superalloy with the cluster formula of ( m = 3), which is well consistent with the ideal cluster formula with the atom number of Z = 16 in diverse alloy systems 40 , 49 , 54 , 55 .…”

“…It has been demonstrated by neutron experiments that the local atomic distributions of solute elements in solid solutions are in a good consistence with those in their related ordered phase, which is closely related to the content of solute elements 50 – 52 . We have classified the alloying elements into the , , and series, respectively, and the sites of these elements in the cluster formula are determined by the interaction between the solute elements and the base Ni (characterized by the enthalpies of mixing ( ΔH ) 40 , 53 ). Since the series of elements (Al, Nb, Ta, Ti, and Si) have large negative ΔH with the base Ni ( ΔH Al–Ni = − 22 kJ/mol, ΔH Nb–Ni = − 30 kJ/mol, ΔH Ta–Ni = − 29 kJ/mol, ΔH Ti–Ni = − 35 kJ/mol and ΔH Si–Ni = − 40 kJ/mol 53 ), they would like to be in the cluster center preferentially to form such a cluster in FCC solid solution and the excessive amount of elements could also enter into the glue atom sites.…”

“…In our previous work, we used a cluster formula approach to explore the composition rules of Ni-base superalloys, in which all alloying elements are classified into three groups, Al-like series, Cr-like series, and Ni-like series, according to the interaction between the alloying element with the base Ni 40 , 41 . Thus, a uniform cluster formula of was obtained to analyze alloy composition, which would be described in details in the next section.…”

Cluster-formula-embedded machine learning for design of multicomponent β-Ti alloys with low Young’s modulus

“…In our previous alloys, we applied the cluster-formula approach into other compositionally complex systems to explore the relationship between the alloy composition and properties 37,64 . For instance, it is found that the compositions of Ni-base single crystal superalloys with prominent creep resistance satisfy a uniform cluster formula of ½Al À Ni 12 ðAl 1:5 Cr 1:5 Þ, in which all the alloying elements are classified into three groups, Al series (Al), Cr series (Cr), and Ni series (Ni) 65 . Since the creep rupture lifetime of these superalloys could be correlated to the composition in light of the cluster-formula approach, the cluster-formula-embedded ML model would predict the rupture lifetime of alloys and design new alloy compositions with high performance.…”

Solid-State Diffusion Bonding of NbSS/Nb5Si3 Composite Using Ni/Al and Ti/Al Nanolayers

“…With the development of aeronautical industry, heat-resistant structural materials face more severe challenges [1,2]. Refractory metal silicides are regarded as a potential candidate material for the next-generation aircraft engines [3]. Nb SS /Nb 5 Si 3 in situ composite is one of the inspiring ultra-high-temperature structural materials due to its excellent properties such as high melting point, low density and attractive high-temperature mechanical properties [4,5].…”