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<p>The influence of different cryogenic treatment durations (0–48&#xa0;h) on the microstructural evolution and comprehensive properties of the 2195 Al–Li alloy was systematically investigated, aiming to optimize its mechanical and wear resistance through a multi-time gradient process for aerospace structural applications. The results indicate that after cryogenic treatment, the grains of the 2195 Al–Li alloy were refined, the dislocation density was progressively increased until reaching saturation, and the mechanical properties were initially enhanced and subsequently deteriorated. The sample subjected to 36 hours of cryogenic treatment (CT36) exhibited the best overall performance. Significant grain refinement was observed in the CT36 sample, with the average grain size reduced from 6.79&#xa0;μm (untreated condition) to 3.94&#xa0;μm. The yield strength (YS), ultimate tensile strength (UTS), elongation (TE), and hardness were increased by 4.8%, 7.6%, 23.8%, and 22.1%, respectively. Furthermore, the average friction coefficient of the CT36 sample during the stable wear stage was reduced by 50%, and the wear rate was decreased by 60.2% compared to the untreated sample, demonstrating optimal wear resistance.</p>

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Effects of Cryogenic Treatment on Microstructures, Mechanical Properties, and Wear Resistance of 2195 Al–Li Alloys

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Peng Jiang,
  • Baiqi Liu,
  • Qiya Wang,
  • Xianlong Wang,
  • Haijun Pan,
  • Zhizhi Wang,
  • Wangping Wu

摘要

The influence of different cryogenic treatment durations (0–48 h) on the microstructural evolution and comprehensive properties of the 2195 Al–Li alloy was systematically investigated, aiming to optimize its mechanical and wear resistance through a multi-time gradient process for aerospace structural applications. The results indicate that after cryogenic treatment, the grains of the 2195 Al–Li alloy were refined, the dislocation density was progressively increased until reaching saturation, and the mechanical properties were initially enhanced and subsequently deteriorated. The sample subjected to 36 hours of cryogenic treatment (CT36) exhibited the best overall performance. Significant grain refinement was observed in the CT36 sample, with the average grain size reduced from 6.79 μm (untreated condition) to 3.94 μm. The yield strength (YS), ultimate tensile strength (UTS), elongation (TE), and hardness were increased by 4.8%, 7.6%, 23.8%, and 22.1%, respectively. Furthermore, the average friction coefficient of the CT36 sample during the stable wear stage was reduced by 50%, and the wear rate was decreased by 60.2% compared to the untreated sample, demonstrating optimal wear resistance.