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<p>TA15 titanium alloy is widely adopted in the aerospace industry due to its exceptional performance at high temperatures. The enhancement of mechanical characteristics suitable for engineering purposes necessitates a subsequent refinement procedure for TA15 components. Also understanding the manner in which materials undergo deformation in response to various application parameters, such as temperature and stress is very important. This research examines how various heat treatments (at 750&#xa0;°C for 8&#xa0;h and 950&#xa0;°C for 8&#xa0;h) affect the microstructure and deformation behavior of TA15 samples produced through laser melting deposition. The crystallographic orientation and band contrast are analyzed systematically. An innovative approach involving in-situ scanning electron microscopy during tensile testing is adopted to precisely identify crack initiation and trace the propagation pattern of slip bands. The deformation mechanisms at high temperature are analyzed. The findings revealed that annealing TA15 at 750&#xa0;°C refined its basket-weave α + β structure, with α colonies along β boundaries. At 950&#xa0;°C, coarse α lamellae and fine α + β phases formed localized basket-weave structures. HT2’s optimal ductility and strength stemmed from retained β phase and thin α laths, enabling multi-mechanism deformation as compared to HT1. At 500&#xa0;°C, HT1 showed shear-driven failure, while HT2 exhibited necking with dimpled fracture.</p>

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High Temperature Deformation Mechanisms in Laser Melting Deposition TA15 Alloy under In-situ SEM Tensile Testing

  • 期刊论文

  • 发表日期：

    2025年9月18日

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  • Mahnoor Boukhari,
  • Junxia Lu,
  • Muhammad Rizwan,
  • Xiaopeng Cheng,
  • Haibin Li

摘要

TA15 titanium alloy is widely adopted in the aerospace industry due to its exceptional performance at high temperatures. The enhancement of mechanical characteristics suitable for engineering purposes necessitates a subsequent refinement procedure for TA15 components. Also understanding the manner in which materials undergo deformation in response to various application parameters, such as temperature and stress is very important. This research examines how various heat treatments (at 750 °C for 8 h and 950 °C for 8 h) affect the microstructure and deformation behavior of TA15 samples produced through laser melting deposition. The crystallographic orientation and band contrast are analyzed systematically. An innovative approach involving in-situ scanning electron microscopy during tensile testing is adopted to precisely identify crack initiation and trace the propagation pattern of slip bands. The deformation mechanisms at high temperature are analyzed. The findings revealed that annealing TA15 at 750 °C refined its basket-weave α + β structure, with α colonies along β boundaries. At 950 °C, coarse α lamellae and fine α + β phases formed localized basket-weave structures. HT2’s optimal ductility and strength stemmed from retained β phase and thin α laths, enabling multi-mechanism deformation as compared to HT1. At 500 °C, HT1 showed shear-driven failure, while HT2 exhibited necking with dimpled fracture.