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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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Nb-Ti-Co氢分离合金近共晶点处的显微组织及其渗氢性能*
DOI: 10.3724/SP.J.1037.2013.00474, PP. 71-78
Keywords: Nb-Ti-Co合金,显微组织,氢渗透系数,氢脆
Abstract:
探寻了Nb-Ti-Co氢分离合金的共晶点成分并利用Bridgman定向凝固实验对其进行验证,研究了近共晶点处9种合金的显微组织、氢渗透性能及氢脆现象,并与贵金属Pd的氢渗透性能进行比较.结果表明,Nb-Ti-Co三元合金中完全由共晶Nb(Ti,Co)+TiCo相构成的合金成分为Nb31Ti35Co34;当Bridgman定向凝固实验的抽拉速率为5μm/s时,共晶组织中的2相呈现出规则的共生生长.9种合金中完全由共晶相构成的合金在673.5K具有最大的氢渗透系数2.7×10-8mol/(m·s·Pa0.5),是相同条件下Pd的氢渗透系数的1.72倍;Nb含量相同时,随着Ti/Co比值的降低,氢渗透系数逐渐减小.氢渗透过程中,合金膜内部的初生TiCo相作为裂纹源首先萌生裂纹,而后以此发生二次裂纹现象并逐渐向膜边缘扩展;当TiCo相体积分数小于5%时,共晶Nb(Ti,Co)+TiCo相抵消原有初生TiCo相上的裂纹源,使得合金膜具有良好的抗氢脆性能.
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