Structure and micromechanical properties of SHS composites with a copper matrix: peculiarities of formation

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Abstract

Self-propagating high-temperature synthesis (SHS) is one of the promising methods for producing strong and wear-resistant composites. The use of copper as a matrix due to the unique combination of electrical and thermal conductivity is of particular interest. Monolithic SHS composites of the Cu–Ti–C–B and Cu–Ti–C systems are currently little studied. The information on the phase composition of such composites is contradictory, and data on micromechanical properties is practically absent. The paper presents the results of a comparative analysis of the structure and micromechanical properties of composites of the Cu–Ti–C and Cu–Ti–C–B systems. It is found that the matrix of both composites is a copper-based solid solution supersaturated with titanium, in which nanosized Cu4Ti intermetallic compound particles precipitate upon cooling. TiC particles (Cu–Ti–C composite) and TiC and TiB2 particles (Cu–Ti–C–B composite) are the strengthening phases resulting from SHS. In the Cu–Ti–C–B composite, the original particles of unreacted B4C boron carbide were preserved, the microhardness of which was 3680 HV 0.1. The most ductile structural constituent in the Cu–Ti–B system composite is the Cu+Cu4Ti mechanical mixture, due to which further plastic deformation is possible to obtain parts of a given shape. During the study of micromechanical properties, the maximum strength indicators of HIT, HV, We, Re, HIT/E* were recorded in the Cu–Ti–C–B system composite, which allows expecting high wear resistance of products made of it.

About the authors

Nataliya Borisovna Pugacheva

Institute of Engineering Science of the Ural Branch of RAS, Yekaterinburg

Email: nat@imach.uran.ru
ORCID iD: 0000-0001-8015-8120

Doctor of Sciences (Engineering), Associate Professor, chief researcher

Russian Federation

Tatyana Mikhailovna Bykova

Institute of Engineering Science of the Ural Branch of RAS, Yekaterinburg

Author for correspondence.
Email: tatiana_8801@mail.ru
ORCID iD: 0000-0002-8888-6410

PhD (Engineering), senior researcher

Russian Federation

Ekaterina Igorevna Senaeva

Institute of Engineering Science of the Ural Branch of RAS, Yekaterinburg

Email: nata5-4@yandex.ru
ORCID iD: 0000-0001-8625-2310

junior researcher

Russian Federation

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