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Si and Mn effect on mechanical properties and linear shrinking of non-magnetic Cu-Al system cast bronzes

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Category: Content №2 2025

Last Updated on 26 April 2025

Published on 30 November -0001

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Authors:

T.V.Kimstach, orcid.org/0000-0002-8993-201X, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

K.I.Uzlov, orcid.org/0000-0003-0744-9890, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O.P.Bilyi, orcid.org/0000-0003-1234-5404, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

S.I.Repyakh*, orcid.org/0000-0003-0203-4135, Ukrainian State University of Science and Technologies, Dnipro, Ukraine, е-mail:  This email address is being protected from spambots. You need JavaScript enabled to view it.

* Corresponding author e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

повний текст / full article

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2025, (2): 113 - 120

https://doi.org/10.33271/nvngu/2025-2/113

Abstract:

Purpose. To establish Si and Mn influence on mechanical properties level at 20 °C and aluminum bronzes structure with Al from 3 to 9 % mass content investigation.

Methodology. Cast bronzes mechanical properties have been determined based on their fracture results on FP-100/1 machine and PSW-30 pendulum impactor. Microstructure has been examined using Neophot-21 optical microscope. Bronzes linear shrinkage coefficients have been calculated based on results of determining cast cylindrical samples lengths changes. Si and Mn complex influence on bronzes properties has been determined by the results of simplex triangles according to H. Scheffer plan constructing. Temperature has been measured with chromel-alumel thermocouple completed with electronic potentiometer. Bronzes chemical composition has been determined on ­EXPERT 4L analyzer.

Findings. Silicon (up to 2 %) and manganese (up to 2 %) adding to Cu-Al system bronze, while aluminum content from 9 to 3 % reducing, leads to bronze ultimate tensile and yield strength decreasing during stretching and its plasticity increasing. At the same time, bronze structure, at any combination of Al, Si and Mn contents within their changes in studied limits, remains single-phase.

Originality. For the first time, comprehensive assessment of influence of Si and Mn with simultaneous decrease in Al content on mechanical properties and linear shrinkage of Cu-Al-Si-Mn system cast bronzes has been carried out. It has been established that all bronzes of studied compositions have a single-phase structure and mechanical properties level that is inherent for pressure-worked bronzes.

Practical value. The research results expand understanding about elemental and complex influence of Si and Mn on aluminum bronzes properties, provide an opportunity to choose a bronze with properties required level from its cast billet for deformation or to design castings taking into account the linear shrinkage values discovered in this work. The data obtained can also be the basis for new foundry, corrosion-resistant, non-magnetic bronzes, which have strength and density at the level of some carbon steel grades, development. Such materials have been used for parts that operate in chemically aggressive environments manufacturing, for control and measuring equipment and devices parts, for ship parts and naval devices, fittings, bushings, couplings, intrinsically safe tools, etc.

Keywords: bronze, strength, shrinkage, mechanical properties, aluminum, silicon, manganese

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