首页|Grain refinement and phase precipitation simultaneously improve the strength and ductility of ultra-high strength titanium alloy sheets

Grain refinement and phase precipitation simultaneously improve the strength and ductility of ultra-high strength titanium alloy sheets

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The simultaneous high strength and high plasticity of metastable-β titanium alloy sheets remains a difficult challenge.In this work,a 1.2 mm thick sheet of Ti-15Mo-3Al-2.7Nb-0.25Si titanium alloy was obtained after rolling and annealing,and then subjected to a duplex-ageing treatment.The pre-ageing temperatures fell in the range of 300-390 ℃ for 0.5-2h.The re-ageing temperatures were in the range of 500-600 ℃.After character-ization,it was found that the alloy precipitates ω-phases during the pre-ageing process,and the distribution of such ω-phases evolves unevenly and increases in number with the increase of the pre-ageing temperature.Therefore,the strengthening mechanism of the alloy sheet is mainly α-phase nucleation assisted by ω-phase.Moreover,grain refinement appears as a mechanism to ensure the plasticity of the alloy.Finally the ω-phase evolution law is discussed in detail and the strengthening mechanism of the alloy sheet is also analyzed.At this work,a metastable-β titanium alloy sheet with strength of 1445.75 MPa and elongation of 6.55％was obtained.This study provides a new idea for the microstructure design and process improvement of the metastable-β ti-tanium alloy sheet.

Metastable-β titaniumDuplex-ageing treatmentω-phaseStrengthening mechanism

Xudong Kang、Zhaoxin Du、Shaojun Wang、Jun Cheng、Zhiyong Yue、Tianhao Gong、Jingshun Liu、Shuzhi Zhang

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School of Materials Science and Engineering,Inner Mongolia University of Technology,Hohhot,010051,China

Collaborative Innovation Center of Non-ferrous Metal Materials and Processing Technology Co-constructed by the Provience and Ministry,Inner Mongolia Autonomous Region,Inner Mongolia University of Technology,Hohhot,010051,China

Northwest Institute for Non-Ferrous Metal Research,Shanxi Key Laboratory of Biomedical Metal Materials,Xian,710016,China

College of Mechanical Engineering,Inner Mongolia University of Technology,Hohhot,010051,China

State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao,066004,China

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2024

10.1016/j.pnsc.2024.08.001

自然科学进展·国际材料(英文)
国家自然科学基金委员会

自然科学进展·国际材料(英文)

影响因子：0.25
ISSN：1002-0071
年,卷(期)：2024.34(5)