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Abstract <p>In the present paper, the effect of diffusion bonding (DB) and post-bond heat treatment on a microstructure and mechanical properties of a Ti<sub>2</sub>AlNb-based alloy VTI-4 was studied. DB was carried out using an SPS 10–3 selective plasma sintering system. The optimum mechanical properties of DB-joints (σ<sub>u</sub>&#xa0;= 1240 MPa, σ<sub>0.2</sub> = 1070 MPa, δ = 4.6%) were achieved after DB at temperatures of 940°C and 960°C, a holding time of 120 minutes, and a pressure of 15–25 MPa. The obtained mechanical properties were equal to that of the initial material (σ<sub>u</sub> = 1230 MPa, σ<sub>0.2</sub> = 1190 MPa and δ = 3.5%, 400 ± 10 HV<sub>0.2</sub>). After DB at 940–960°C, microhardness was 395 ± 30 HV<sub>0.2</sub>, which was higher than that after DB at 920°C (360 ± 25 HV<sub>0.2</sub>). DB provoked an increase in the volume fraction of the O-phase along the joint interface compared to the base material. Post-bond heat treatment resulted in an additional increase in the volume fraction of the O-phase that increased strength and hardness.</p>

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Diffusion Bonding of Ti2AlNb-Based Alloy Using Spark Plasma Sintering Equipment

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • S. Naumov,
  • D. Panov,
  • R. Chernichenko,
  • V. Sokolovsky,
  • M. Yapryntsev,
  • D. Tagirov,
  • G. Salishchev,
  • V. Lukianov

摘要

Abstract

In the present paper, the effect of diffusion bonding (DB) and post-bond heat treatment on a microstructure and mechanical properties of a Ti2AlNb-based alloy VTI-4 was studied. DB was carried out using an SPS 10–3 selective plasma sintering system. The optimum mechanical properties of DB-joints (σu = 1240 MPa, σ0.2 = 1070 MPa, δ = 4.6%) were achieved after DB at temperatures of 940°C and 960°C, a holding time of 120 minutes, and a pressure of 15–25 MPa. The obtained mechanical properties were equal to that of the initial material (σu = 1230 MPa, σ0.2 = 1190 MPa and δ = 3.5%, 400 ± 10 HV0.2). After DB at 940–960°C, microhardness was 395 ± 30 HV0.2, which was higher than that after DB at 920°C (360 ± 25 HV0.2). DB provoked an increase in the volume fraction of the O-phase along the joint interface compared to the base material. Post-bond heat treatment resulted in an additional increase in the volume fraction of the O-phase that increased strength and hardness.