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<p>NiAl based materials doped with transition metals are currently receiving a lot of attention due to their high mechanical properties, including at elevated temperatures. Pseudo-eutectic materials based on the NiAl system alloyed with Cr, Mo, Co and V in equiatomic proportions were obtained by high-energy mixing of initial NiAl and metal powders and spark plasma sintering. The alloying components were selected based on previously obtained extensive research results provided irrefutable evidence of their suitability. Thermodynamic modeling by Jmatpro and MAAT software products were used to predict the composition of the sintered material. In particular, the dependencies of the equilibrium chemical composition on temperature, the components activities in the ternary systems, and the mixing Gibbs energy were obtained. The study of the sintered material microstructure showed its multiphase nature with the presence of areas enriched with alloying elements in different amounts. The microstructure was characterized by the presence of areas with submicron spherical and micron lamellar phases. According the phase composition modeling at the sintering temperature there are BCC phase, NiAl-phase and topologically close-packed (TCP) phases (μ and σ) in alloys. The 3-point flexural strength and Young's modulus of the material were determined at room and elevated temperatures (750, 900, and 1200&#xa0;°C). A high stability in the mechanical properties of the material was observed. The material had a strength of 760&#xa0;MPa at room temperature and 694&#xa0;MPa at 900&#xa0;°C.</p>

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Preparation and Study of the Sintered NiAl-CrMoCoV Equiatomic System Composite Material Structure and Properties

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • L. E. Agureev,
  • S. V. Savushkina,
  • E. A. Danilina,
  • S. D. Ivanova,
  • A. V. Ivanov,
  • S. A. Garibashvili

摘要

NiAl based materials doped with transition metals are currently receiving a lot of attention due to their high mechanical properties, including at elevated temperatures. Pseudo-eutectic materials based on the NiAl system alloyed with Cr, Mo, Co and V in equiatomic proportions were obtained by high-energy mixing of initial NiAl and metal powders and spark plasma sintering. The alloying components were selected based on previously obtained extensive research results provided irrefutable evidence of their suitability. Thermodynamic modeling by Jmatpro and MAAT software products were used to predict the composition of the sintered material. In particular, the dependencies of the equilibrium chemical composition on temperature, the components activities in the ternary systems, and the mixing Gibbs energy were obtained. The study of the sintered material microstructure showed its multiphase nature with the presence of areas enriched with alloying elements in different amounts. The microstructure was characterized by the presence of areas with submicron spherical and micron lamellar phases. According the phase composition modeling at the sintering temperature there are BCC phase, NiAl-phase and topologically close-packed (TCP) phases (μ and σ) in alloys. The 3-point flexural strength and Young's modulus of the material were determined at room and elevated temperatures (750, 900, and 1200 °C). A high stability in the mechanical properties of the material was observed. The material had a strength of 760 MPa at room temperature and 694 MPa at 900 °C.