Author(s)

Junyi Liang ^1,2, Yongfa Zheng ^1,2, Xuehong Cui ^1,2

Affiliation(s)

¹ Guangxi Colleges and Universities Key Laboratory of Environmental Friendly Materials and Ecological Restoration, School of Materials, Guangxi Minzu University, Nanning, Guangxi, China
² Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, Guangxi, China

Corresponding Author

Xuehong Cui

ABSTRACT

The Mn-Ni-Si ternary system is an important ternary alloy system in the steel used for reactor pressure vessel shells, closely related to the service life of the reactor pressure vessel and the compositional segregation caused by neutron irradiation. This article uses elemental Mn, Ni, and Si as raw materials for smelting alloy samples, employing the vacuum arc melting method to prepare 31 Mn-Ni-Si ternary alloys. The Mn-Ni-Si ternary system is established at an isothermal section of 500 ℃ through techniques such as X-ray diffraction analysis and scanning electron microscopy. The results indicate the presence of seven ternary compounds and 24 equilibrium three-phase regions in the 500 ℃ isothermal section. Notably, since the MnSi phase is a simple cubic alloy phase, Ni will substitute for Mn in the MnSi phase in the Mn-Ni-Si alloy, thereby forming a solid solution with a larger solubility.

KEYWORDS

Mn-Ni-Si System; Phase Diagram; X-Ray Diffraction; Scanning Electron Microscopy

CITE THIS PAPER

Junyi Liang, Yongfa Zheng, Xuehong Cui, Isothermal section of the Mn-Ni-Si ternary system at 500℃. Journal of Materials, Processing and Design (2025) Vol. 9: 93-101. DOI: http://dx.doi.org/10.23977/jmpd.2025.090110.

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