Ti-5Al-2.5Sn ELI钛合金低温变形机理研究
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航天材料及工艺研究所,北京 100076

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陆子川,1992年出生,博士,主要从事先进钛合金材料及其超塑成形工艺研究工作。E-mail:luzichuan1992@163.com

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装备预先研究项目(项目编号:61409220123)


Deformation Mechanism of Ti-5Al-2.5Sn ELI Titanium Alloy Under Cryogenic Temperature
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Aerospace Research Institute of Materials & Processing Technology,Beijing 100076

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    摘要:

    为满足我国大型航天运输系统对130 L低温冷氦气瓶的应用需求,采用Ti-5Al-2.5Sn ELI钛合金板材结合超塑性等温精密冲压工艺研制了130 L低温冷氦气瓶,并系统研究了Ti-5Al-2.5Sn ELI钛合金的低温变形机理。研究结果表明,Ti-5Al-2.5Sn ELI钛合金在20 K条件下呈现出滑移+孪生交替进行的变形行为,原始板材的不完全再结晶现象在热成形过程中得以消除,且球体本体的完全等轴再结晶组织及曲折晶界特征可以很好地协调Ti-5Al-2.5Sn ELI钛合金的低温变形过程,使其具备优异的低温力学性能。说明采用的超塑性等温精密冲压工艺是一种研制大规格航天压力容器行之有效的工艺方案。

    Abstract:

    In order to satisfy the application requirements of the large space transportation systems in china, the 130 L helium cylinder is firstly developed by superplastic-isothermal forming method using Ti-5Al-2.5Sn ELI titanium alloy plate, and the cryogenic temperature deformation mechanism of Ti-5Al-2.5Sn ELI titanium alloy is also systematically investigated in this work. The experimental results indicate that Ti-5Al-2.5Sn ELI titanium alloy shows the cyclic deformation behavior of sliding and twinning modes under 20 K, and the incomplete re-crystallization of raw material can be eliminated by thermal forming process. Furthermore, the completely recrystallized grains with equiaxial characteristic and the curved grain boundaries of helium cylinder can coordinate cryogenic temperature deformation process nicely, inducing the excellent mechanical properties of Ti-5Al-2.5Sn ELI titanium alloy under cryogenic temperature. Therefore, the superplastic-isothermal forming method is a feasible technology to manufacture the large pressure vessel for the aerospace industry.

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陆子川,纪玮,微石,姚草根,张绪虎. Ti-5Al-2.5Sn ELI钛合金低温变形机理研究[J].宇航材料工艺,2020,50(6):41-47.

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  • 收稿日期:2020-06-15
  • 最后修改日期:2020-09-17
  • 录用日期:2020-06-16
  • 在线发布日期: 2021-01-15