Ti-2Al-2.5Zr合金He离子辐照效应研究
Effect of He on properties and microstructure of Ti-2Al-2.5Zr alloy
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摘要: 在Ti-2Al-2.5Zr合金中注入能量为75 keV的He离子，注入剂量分别为5×1016cm-2，1×1017 cm-2。通过显微硬度测量和剖面电子显微观察，研究了He离子对Ti-2Al-2.5Zr合金力学性能和显微组织的影响。结果表明:样品的显微硬度随He离子注量的增加而升高，在温度为350和550 ℃的Ar气中退火后硬度有所下降。剖面电子显微观察发现有位错环和He气泡生成，退火后He气泡有长大、缺陷有回复的趋势。辐照产生的位错环是辐照后硬度升高的直接原因，其退火发生回复又引起硬度随退火温度的升高而降低。
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关键词:
- Ti-2Al-2.5Zr合金 /
- 离子注入 /
- 透射电镜 /
- 显微硬度
Abstract: Ion-implantation-enhanced hardening and microstructure change of a Ti-2Al-2.5Zr alloy by 75 keV helium ion implantation with the dose of 5×1016 cm-2 or 1×1017 cm-2 is investigated. The maximum temperature during the implantation was monitored to be less than 200 ℃. The base pressure in the vacuum chamber was 6×10-4 Pa, and the working pressure was 1.6×10-3 Pa. The morphology and the structure of the implant samples have been characterized by TEM using a JEOL 2010FEG at 200 keV. The surface characterization of samples was studied by Vickers hardness tests. The He-induced hardening was observed. The He-induced hardening decreases with annealing at 350 ℃ and 550 ℃. The results of TEM analysis show that helium bubbles and dislocation loops are formed in the near surface region. He-ion-i-
Key words:
- ti-2al-2.5zr alloy /
- he ion implantation /
- tem /
- microhardness
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