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<p>In this study an intricate examination, comparing various samples, has been conducted to elucidate the impact of post-heat treatments on both microstructural characteristics and mechanical properties undergoing deformation. The initial microstructure of Laser direct melting deposition (LDMD) TA15 is strategically tailored into a dual-phase arrangement of lamellar α and β phases through diverse thermal processing methods conducted both above and below the β‐transus temperature. It is crucial to analyze how their deformation behavior varies post-annealing. HT1 exhibited diminished strength and restricted plasticity before fracturing, contrasting with HT2 and HT3. HT2 displayed inferior strength yet superior plasticity pre-fracture compared to HT3. Conversely, HT3 showcased elevated strength yet less plasticity. Thermal treatment at 950&#xa0;°C offers the desired amalgamation of strength and ductility. The analysis of fracture morphology revealed a direct correlation between the duration of heat treatment and the augmentation in both the size and depth of dimples accompanied by the necessary levels of ultimate tensile strength.</p>

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Microstructure evolution and deformation behavior of laser-deposited TA15 alloy using in situ SEM study

  • 期刊论文

  • 发表日期：

    2025年1月3日

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  • Mahnoor Boukhari,
  • Junxia Lu,
  • Muhammad Rizwan,
  • Xiaopeng Cheng,
  • Mujahid Abbas,
  • Qi Ren,
  • Chan Guo

摘要

In this study an intricate examination, comparing various samples, has been conducted to elucidate the impact of post-heat treatments on both microstructural characteristics and mechanical properties undergoing deformation. The initial microstructure of Laser direct melting deposition (LDMD) TA15 is strategically tailored into a dual-phase arrangement of lamellar α and β phases through diverse thermal processing methods conducted both above and below the β‐transus temperature. It is crucial to analyze how their deformation behavior varies post-annealing. HT1 exhibited diminished strength and restricted plasticity before fracturing, contrasting with HT2 and HT3. HT2 displayed inferior strength yet superior plasticity pre-fracture compared to HT3. Conversely, HT3 showcased elevated strength yet less plasticity. Thermal treatment at 950 °C offers the desired amalgamation of strength and ductility. The analysis of fracture morphology revealed a direct correlation between the duration of heat treatment and the augmentation in both the size and depth of dimples accompanied by the necessary levels of ultimate tensile strength.