钇提高Ni_3Al基合金IC6氧化皮/基体粘着力的机制  

MECHANISM OF IMPROVING THE COHERENCE BETWEEN OXIDE SCALE AND SUBSTRATE OF Ni_3Al BASE ALLOY IC6 BY YTTRIUM

作　　者：肖程波[1] 韩雅芳 

机构地区：[1]北京航空材料研究院,北京100095

出　　处：《金属学报》1998年第11期1158-1162,共5页Acta Metallurgica Sinica

基　　金：国家863计划资助!715-005-0020

摘　　要：测定了添加Y对IC6合金在1100℃抗氧化性能的影响。结果表明，加入0.04％-0.30％Y，能显著提高氧化皮／基体之间的粘着力.利用电子探针元素线扫描技术、观察到合金表面在氧化过程中形成一层富Ni和MO、贫Al的扩散层、发现Y能阻止S偏析至氧化皮／基体界面、从而提高氧化皮／基体之间的结合力.X射线衍射对剥落的氧化物组成的分析表叫，Y能促进Al的选择氧化，使得加Y后合金的高温抗氧化能力得以提高.The oxidation resistance of Ni3Al base alloy IC6 with different amounts of yttrium at 1100℃ was determined. The results showed that the coherence between the oxide scale and the substrate is substantially improved by adding 0.04% -0.30%Y. The results of the X-ray line scan of EPMA showed that a diffusion layer rich in Ni, Mo and poor in Al is formed during the oxidation process, and that segregation of sulfur to the interface between the oxide scale and the substrate is inhibited by yttrium, which results in the improvement of the coherence between the oxide scale and the substrate. The results of X-ray diffraction analysis of the spalled oxides showed that yttrium can promote the slective oxidation of aluminum and hence improve the high temperature oxidation resistance of alloy IC6.

关 键 词：NI3AL 高温氧化 钇 耐热合金 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TG172.82[金属学及工艺—合金]