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[Chen Hang,Mi Guangbao,Li Peijie,Huang Xu and Cao Chunxiao.Influence mechanism of graphene oxide on non-oxidation behavior of near-αhigh-temperature titanium alloy[J].Rare Metal Materials and Engineering,2022,51(8):2899~2906.]
Influence mechanism of graphene oxide on non-oxidation behavior of near-αhigh-temperature titanium alloy
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Received:January 03, 2022  Revised:January 30, 2022
DOI:
Key words: High-temperature titanium alloys  Graphene oxide  Non-isothermal oxidation  Oxidation kinetics  Oxidation mechanism
Foundation item:国家科技重大专项(J2019-VIII-0003-0165)和国家自然科学基金“叶企孙”科学(U2141222)
Author NameAffiliation
Chen Hang,Mi Guangbao,Li Peijie,Huang Xu and Cao Chunxiao  
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Abstract:
      The non-isothermal oxidation tests ofthe near-α high-temperature titanium alloys (Ti150) without graphene oxide (GO) and with 0.5 wt.% GO were carried out at room temperature ~1500 ℃ by thermogravimetry-differential scanning calorimetry method. The influence mechanism of GO on non-isothermal oxidation behavior was revealed by analyzing the oxidation mass gain laws and the microstructure characteristics of oxidation products. The results showed that the non-isothermal oxidation process of Ti150 alloy with GO included almost no oxidation (≤800 ℃), slow dissolution of oxygen in α phase (800~1160 ℃), accelerated dissolution of oxygen in two-phase region (1160~1300 ℃), rapid dissolution of oxygen in β phase (1300~1330 ℃), and violent growth of oxide scale (1330~1500 ℃) five stages. The dissolution of oxygen in β phase and growth of oxide scale were the main reasons for the non-isothermal oxidation mass gain. After non-isothermal oxidation to 1500 ℃, the non-isothermal oxidation mass gain and oxide scale thickness of Ti150 alloy with GO were 10.8% and 17.9% lower than those without GO, respectively. The main mechanism of GO improving the non-isothermal oxidation resistance was that the beginning temperature of rapid dissolution of oxygen in β-Ti was delayed due to the higher β-transus temperature of Ti150 alloy with GO, which resulted in the decrease of oxygen solution, and the finer grain made the Al2O3-rich oxide layer and the Sn-rich layer more continuous and dense, which were more effective barriers to ion diffusion.