Preparation of NiAl-AlMg6 Functionally Graded Composite Using the Energy of a Highly Exothermic Ti-C Mixture during Self-Propagating High-Temperature Synthesis

Igor Denisov; Stepan Seropyan; Andrey Malakhov; Denis Shakhray

doi:10.3390/ma16247584

Preparation of NiAl-AlMg6 Functionally Graded Composite Using the Energy of a Highly Exothermic Ti-C Mixture during Self-Propagating High-Temperature Synthesis

Materials (Basel). 2023 Dec 10;16(24):7584. doi: 10.3390/ma16247584.

Authors

Igor Denisov¹, Stepan Seropyan¹, Andrey Malakhov¹, Denis Shakhray²

Affiliations

¹ Merzhanov Institute of Structural Macrokinetics and Materials Science (ISMAN), Russian Academy of Sciences, 142432 Chernogolovka, Russia.
² Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences, 142432 Chernogolovka, Russia.

Abstract

A functionally graded composite NiAl-AlMg6 was prepared using the pressure of gaseous reaction products (impurity gases) produced during the synthesis of reactive powders in a sealed reactor. It has been shown that this method can be used to prepare a NiAl/AlMg6 composite with both chaotically oriented pores in the NiAl layer and unidirectionally oriented pores (lotus-type pores). The pore shape in NiAl was found to be dependent on the pressure of the impurity gases and hydrogen present in the starting titanium powder. A mechanism for pore formation in NiAl and AlMg6 composite during SHS is proposed. Thus, functionally graded high-temperature composites can be produced by SHS in a sealed reactor using the chemical reaction energy and the pressure of impurity gases and hydrogen. Additionally, minimizing the influence of impurity gases on the contact zone increases the interface area between NiAl and AlMg6.

Keywords: AlMg6; NiAl; SHS; lotus-type pores; metal-intermetallic layered composite.

Grants and funding

This work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the State Assignment of the Merzhanov Institute of Structural Macrokinetics and Materials Sciences of the Russian Academy of Sciences (ISMAN).