SiCp/2024复合材料的氢脆敏感性研究

STUDY ON THE SUSCEPTIBILITY OF SICp/2024 COMPOSITE TO HYDROGEN ENERITTLEMENT

  • 摘要: 在浸泡、阴极极化、阴极极化同时迭加拉伸变形、添加As2O3毒化剂等常见致氢条件下,通过慢应变速率拉伸试验研究了SiCp/2024复合材料的力学性能,考察了断口形貌.测定了该材料在按几种常用充氢条件充氢后的氢含量.发现虽然强烈阴极极化使材料力学性能下降,但其原因在于阴极极化引起的碱性腐蚀,与氢脆无关.获得了不同于前人研究的新结论:在本文试验条件下SiCp/2024材料不发生氢脆,也不发生不可逆氢损伤,其原因与该材料难以充入氢有关.

     

    Abstract: The mechanical performance of SiCp/2024 composite,after pre-charged with hydrogen and during the dynamical cathodic hydrogen-charging,is studied by the slow strain rate tension technique.The fractographs are examined.The hydrogen content of the composite,alter charged with hydrogen under several usually employed charging conditions,is determined.It is revealed that strong cathodic polarization deteriorates the mechanical performance for the reason of alkaline corrosion caused by the polarization.This deterioration has nothing to do with hydrogen embrittlement.The results lead to a new conclusion,that under the present test conditions,the composite suffers neither hydrogen embrittlement nor irreversible hydrogen damage.This is related to the fail in hydrogen-chaging.

     

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