Effect of directional solidification on the structure and properties of Ni3Al-based alloy single crystals alloyed with Cr, Mo, W, Ti, Co, Re, and REM

Effect of surface relief on solid phase joining of heat-resistant nickel superalloys

“…Materials chosen for the investigation in this study are listed in [4, 6, 7, 12, 22]. Single-crystal Ni 3 Al-based intermetallic superalloy with γ′ and γ phases will be referred to as Alloy 1.…”

“…Single-crystal Ni 3 Al-based intermetallic superalloy with γ′ and γ phases will be referred to as Alloy 1. The initial state of Alloy 1 is primary γ-phase precipitates bordered by a eutectic consisting of γ′ phase with γ-phase interlayers (see Figure 1(a,b) with larger magnification) [6, 7]. The chemical composition of Alloy 1, called VKNA, is presented in [7]; it includes elements such as Ni, Al, Cr, Mo, Zr, B, W, Ti, Co, Re.…”

“…For example, precipitation-hardening nickelbased superalloys such as Inconel 718 and its Russian analogue, the EK61 superalloy, are used for the manufacturing of parts such as a disc, shaft and ring [2,4]. Intermetallic Ni 3 Al-based superalloys are the most promising alloys for producing blades [2,[4][5][6][7]. In Russia, the development and implementation of such alloys are carried out by the researchers from the All-Russian Scientific Research Institute of Aviation Materials in cooperation with other organisations [6,7].…”

“…Intermetallic Ni 3 Al-based superalloys are the most promising alloys for producing blades [2,[4][5][6][7]. In Russia, the development and implementation of such alloys are carried out by the researchers from the All-Russian Scientific Research Institute of Aviation Materials in cooperation with other organisations [6,7].…”

Piercing mandrel strengthening by surfacing with nickel aluminide-based alloy

“…This makes it possible to stabilise the structure with nanosized (up to 70 nm) endogenous phases due to their low solubility in γ'+γ solid solutions [7]. At the same time, due to their surface activity, REMs decrease the melt surface tension and influence the energy required for nucleation centers, which increases their amount [8]. Such a mechanism can also be employed with refractory thermally stable compounds when introducing them into the weld pool melt in the form of exogenous ultrafine particles [9], as well as with REMs with high surface energy.…”