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近年的研究指出,许多含有活性元素Al、Si、Ti或V的金属间合金(如Fe_3Al,FeAl、Ni_3Al、 TiAl、Co_3Ti、(Fe,Co)_3V)在室温大气中进行试验时具有环境脆化敏感性。人们相信,这种外来(非固有)脆性是活性元素与大气中的水分发生反应的结果。通过反应生成的原子氢进入试样内部,从而导致脆性裂纹的扩展和塑性的下降。实验结果表明,在Ni_3Al,Ni_3(Al,Mn)、Ni_3(Al,Si)、添加Be的NisAl、添加低含量B的Ni_3Al中均可发生这种湿气诱导的氢脆现象。但也发现,如果在Ni_3Al和 Ni_3(Si,Ti)中添加足够数量B的话,则环境效应就可予以消除。
Recent studies have shown that many intermetallic alloys (such as Fe3Al, FeAl, Ni3Al, TiAl, Co3Ti, (Fe, Co) _3V) containing the active elements Al, Si, Ti or V have environmental embrittlement when tested at room temperature in the atmosphere Sensitivity. It is believed that this extraneous (extrinsic) fragility is the result of reactive elements reacting with the moisture in the atmosphere. The atomic hydrogen generated by the reaction enters the inside of the sample, resulting in the expansion of the brittle crack and the decrease of the plasticity. The experimental results show that this kind of moisture-induced hydrogen embrittlement can occur in Ni_3Al, Ni_3 (Al, Mn), Ni_3 (Al, Si), Ni added Be, Ni_3Al with low content of B added. However, it has also been found that the environmental effect can be eliminated if a sufficient amount of B is added to Ni_3Al and Ni_3 (Si, Ti).