Investigation of the Phase Composition of the Diffusion Zone in the Al-Ni-Cr Composite Material

Abstract

This paper describes the investigation of the phase composition of the diffusion zone in the H20N80+AD1 composite material obtained by explosion welding, after heat treatment at 630оС, 75h. The isothermal section of the Al-Cr-Ni state diagram at room temperature is given. Microhardness of diffusion zone layers is measured.

Structure of the Al-Сr-Ni Coating Formed on the H20N80 Alloy Substrate and its Transformation at 1150 °С

“…%. According to the state diagram shown in [11] After heat treatment at 1150 o C for 1 hour at the coating surface sufficiently large spherical inclusions are formed (Fig. 2,a) having the following composition: 41 wt.…”

“…% Cr and 51 wt. % Ni, which according to the diagram of Al-Cr-Ni [11] corresponds to the NiAl 3 +Ni 2 Al 3 +Cr(Al) area. Between them there are small inclusions in the form of a mixture (highlighted in red in Fig.…”

“…3,c, d). According to the phase diagram [11] it corresponds to the Cr(Al)+Ni 5 Al 3 +Ni 2 Al 3 area. The inhomogeneous area on the boundary with H20N80 is the same at a 5 hours exposure.…”

“…The inhomogeneous area still has a variable composition similar to a 10 h exposure. The phase composition of the coating is maintained and corresponds to the Cr(Al)+Ni 5 Al 3 +Ni 2 Al 3 area in the triple diagram [11].…”