Synthesis of NiAl Intermetallic Compound under Shock-Wave Extrusion

Abstract

This paper presents the implementation of the first stage of a study on the synthesis of the intermetallic compound in the Ni-Al system under shock-wave extrusion (SWE). A method was developed and experiments involving SWE of the reactive Ni–Al powder mixture were carried out. As a result, it was possible to obtain up to 56 vol.% of the final product and achieve 100% synthesis of NiAl. The results of metallographic analysis indicate that the process of high-velocity collapse of the tube created conditions for the formation of a cumulative flow, which directly affects the phase formation in NiAl. It was shown that the presence of the central hole in the powder sample reduced the effect of the Mach stem on the homogeneity of the NiAl structure. It was also determined that with a central hole with a 5 mm diameter, the effect of the Mach stem could not be observed at all. The goals of further studies are achieving 90–100 vol.% of the final product and reducing the porosity in the final product. Preliminary experimental studies have shown great potential for SWE to produce composite metal–intermetallic materials.

Effect of sintering duration on structure and properties of Ni-Al metal-intermetallic composites produced by SPS

“…MIL composites based on Ni and Al are given an increased attention due to the favorable properties of nickel aluminides, in particular, high elastic modulus and microhardness, low density, and high heat resistance. Besides, nickel aluminides have high wear and oxidation resistance [5][6][7][8]. These features make Ni-Al-based MIL composites an attractive material for producing housing elements for gas turbine engines, large vessels and pipes operating under high pressure, heat-exchange elements in cryogenic, chemical and energy equipment.…”

Combustion Synthesis of Metal-Intermetallic-Ceramic Laminate AlMg6-NiAl-TiC Composite

“…Additionally, to produce metal-intermetallic-ceramic laminate composites (which are layered materials based on NiAl and titanium carbide with a metal), an SHS process is conducted in a reactor under a pressure of 13 MPa in an atmosphere of argon [29]. Moreover, MIL composites can be produced through the SHS mode and explosive welding [30][31][32]. A common difficulty in the production of MIL composites is the significant differences in the physical and mechanical properties between the matrix material and the reinforcing element [21,23].…”