| 摘要: |
| 采用磁控溅射的方法在M951铸造合金表面制备了相同成分的纳米晶涂层，研究了涂层在1 000 ℃和1 100 ℃空气中的恒温氧化行为及在1 000 ℃空气中的循环氧化行为，并与粗晶合金进行了对比。同时利用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、能谱分析仪（EDX）和透射电子显微镜（TEM）对合金及涂层样品氧化前后的微观形貌及相组成进行了分析。结果表明：1 000 ℃ 恒温氧化后合金表面形成了连续的以Al2O3为主的氧化膜；1 000 ℃循环氧化及1 100 ℃恒温氧化后合金表面氧化物分层，外层为NiAl2O4，内层为Al2O3，合金中形成了富Nb的内氧化物，氧化膜发生明显开裂和剥落。而在上述所有试验条件下，纳米晶涂层表面都形成了薄而连续且粘附性好的α-Al2O3保护性氧化膜。纳米化促进了M951合金表面以Al2O3为主的氧化膜的形成，增强了氧化膜的粘附性，显著提高了合金的抗氧化性能。 |
| 关键词: 磁控溅射 纳米晶涂层 恒温氧化 循环氧化 M951合金 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金(51071163)； 国家重点基础研究发展计划(973计划)（2010CB631206, 2012CB625102） |
|
| Effects of Nanocrystallization on Hightemperature Oxidation of M951 Alloy |
|
WANG Xin-yue, WANG Fu-hui, XIN Li, ZHU Sheng-long, WEI hua1,2
|
|
1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819;2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
|
| Abstract: |
| A sputtered nanocrystalline coating of M951 alloy was obtained by means of magnetron sputtering. The isothermal oxidation behaviors at 1 000 ℃ and 1 100 ℃ and the cyclic oxidation behavior at 1 000 ℃ in air were investigated in comparison with M951 cast alloy. Morphologies and phase structure of the cast alloy and its sputtered coating before and after oxidation were analyzed by Xray diffraction(XRD), scanning electron microscope(SEM), energy dispersive X-ray spectroscopy(EDX) and transmission electron microscope(TEM). The results indicated that at 1 000 ℃ after isothermal oxidation a continuous α-Al2O3 rich scale is formed on the cast M951 alloy. However, after cyclic oxidation at 1 000 ℃ and isothermal oxidation at 1 100 ℃, a double oxide scale consisting of an outer NiAl2O4 and an inner Al2O3 layer is formed on the M951 alloy, which cracked and spalled extensively. On the contrary, a thin, continuous and adhesive α-Al2O3 scale formed on the surface of the nanocrystalline coating after isothermal and cyclic oxidation. Nanocrystallization promotes the formation of the adhesive α-Al2O3 scale, thus improveing the oxidation resistance of M951 alloy. |
| Key words: magnetron sputtering nanocrystalline coating isothermal oxidation cyclic oxidation M951 alloy |
