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<p>The present investigation delineates an innovative methodology for the implementation of cyclic thermal treatments on additively manufactured (AM) Ni–Ti–Hf alloy, incorporating differential scanning calorimetry (DSC) in conjunction with quasi-in-situ (specifically, evaluations conducted at the precise location of the thin foil specimen) transmission electron microscopy (TEM) analyses. In this methodology, the identical area of the specimen is scrutinized subsequent to every stage of the thermal treatment. Subsequent to the evaluation of the AM processing parameters, samples exhibiting high relative density were successfully fabricated. Within the AM specimens, coarse grains were discerned, extending in alignment with the build direction (BD). To appraise the feasibility of quasi-in-situ TEM analysis, three distinct thermal treatments were applied to the specimens. In situ observations revealed the formation of nano-sized (6.2 ± 0.1&#xa0;nm) H-phase precipitates following the initial thermal treatment. The quasi-in-situ phase transformation from austenite to martensite was scrutinized during the secondary thermal treatment, which was accompanied by moderate modifications in the grain structure and substantial changes in the diffraction pattern. Over the course of up to 20 thermal treatment cycles, the tertiary thermal treatment exhibited deleterious, progressive oxidation of the thin foil specimen.</p>

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A DSC and TEM-Based Quasi-In-Situ Microstructural Investigation of an Additively Manufactured Ni–Ti–Hf Alloy

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Sudipta Pramanik,
  • Philipp Krooß,
  • Felix Ewald,
  • Thomas Pham,
  • Seyedvahid Sajjadifar,
  • Thomas Niendorf

摘要

The present investigation delineates an innovative methodology for the implementation of cyclic thermal treatments on additively manufactured (AM) Ni–Ti–Hf alloy, incorporating differential scanning calorimetry (DSC) in conjunction with quasi-in-situ (specifically, evaluations conducted at the precise location of the thin foil specimen) transmission electron microscopy (TEM) analyses. In this methodology, the identical area of the specimen is scrutinized subsequent to every stage of the thermal treatment. Subsequent to the evaluation of the AM processing parameters, samples exhibiting high relative density were successfully fabricated. Within the AM specimens, coarse grains were discerned, extending in alignment with the build direction (BD). To appraise the feasibility of quasi-in-situ TEM analysis, three distinct thermal treatments were applied to the specimens. In situ observations revealed the formation of nano-sized (6.2 ± 0.1 nm) H-phase precipitates following the initial thermal treatment. The quasi-in-situ phase transformation from austenite to martensite was scrutinized during the secondary thermal treatment, which was accompanied by moderate modifications in the grain structure and substantial changes in the diffraction pattern. Over the course of up to 20 thermal treatment cycles, the tertiary thermal treatment exhibited deleterious, progressive oxidation of the thin foil specimen.