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朱荣涛,王贤,李超永,王香,黄鹏飞.基于小冲杆试验的TC4氢脆行为和机理研究[J].稀有金属材料与工程(英文),2020,49(11):3769~3775.[Zhu Rongtao,Wang Xian,Li Chaoyong,Wang Xiang and Huang Pengfei.Hydrogen embrittlement behavior and mechanisms of Ti-6Al-4V alloy based on small punch test[J].Rare Metal Materials and Engineering,2020,49(11):3769~3775.]
Hydrogen embrittlement behavior and mechanisms of Ti-6Al-4V alloy based on small punch test
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Received:November 01, 2019  Revised:December 10, 2019
DOI:
Key words: Ti-6Al-4V alloy, hydrogen embrittlement, small punch test, hydrogen distribution, phase transition
Foundation item:中央高校基础经费研究(中国矿业大学)(2017XKQY011)
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Zhu Rongtao,Wang Xian,Li Chaoyong,Wang Xiang and Huang Pengfei  
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Abstract:
      Ti-6Al-4V alloy (TC4) is widely used in the field of marine and aviation, and its severe service environment is easy to lead to hydrogen embrittlement (HE) which can cause the degradation of mechanical properties and a sudden catastrophic fracture for the material. To investigate the HE behavior and mechanisms, mechanical properties of the TC4 alloy after different electrochemical hydrogen charging (EHC) time were measured by small punch test (SPT) first. Then, hydrogen distribution and the phase transition of the TC4 alloy with different EHC time were discussed in detail based on the atomic force microscopy (AFM) and X-ray diffraction (XRD) techniques. The strength and elongation obtained by SPT fitting data show obvious deterioration with increasing EHC time while the macroscopic fracture morphology of the TC4 alloy exhibits a transformation from ductile mode to brittle mode. At the same time, the generation of hydride after EHC is proved a main contributor to the HE of the TC4 alloy. The results in this paper provide an effective and convenient method to assess the HE behavior of TC4 alloy in service.