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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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含Er高NbTiAl基合金抗循环氧化性能研究
DOI: 10.3724/SP.J.1037.2013.00394, PP. 1369-1373
Keywords: TiAl,循环氧化,Er,氧化层
Abstract:
采用水冷Cu坩埚真空感应悬浮熔炼技术制备了Ti－46Al－8Nb和Ti－46Al－8Nb－0.1Er合金.根据氧化动力学,结合XRD,SEM和EDS分析氧化层的相结构、显微组织及与基体合金的界面特征,测试了合金在900℃的抗循环氧化性能.结果表明,2种合金循环氧化100h,100cyc均未见氧化膜剥落,Ti－46Al－8Nb－0.1Er较Ti－46Al－8Nb表现出更优良的抗氧化性能,氧化后第二层混合氧化物主要由Al2O3组成,连续致密且与基体良好结合的氧化膜可明显降低合金的氧化速率、减小氧化增重及氧化膜厚度.Er净化了合金基体,阻止O原子内向扩散,并促进TiAl氧化膜中的Al2O3形成,从而提高TiAl基合金的抗循环氧化性能.
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