Effect of Alloy Nanocrystallization and Cr Distribution on the Development of a Chromia Scale
Effect of Alloy Nanocrystallization and Cr Distribution on the Development of a Chromia Scale
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DOI：
10.1149/1.3049345
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发表时间：
2009-03
影响因子：
3.9
通讯作者：
Zhong Huang;X. Peng;C. Xu;Fu-Xin Wang
中科院分区：
文献类型：
--
作者：
Zhong Huang;X. Peng;C. Xu;Fu-Xin Wang
纳米粒子化。通过增加诸如Cr或Al的保护性氧化物形成元素的供应来改善合金的高温抗氧化性的替代方法已经受到相当大的关注。然而，对于含有两相的纳米晶（NC）合金，氧化物形成元素的空间分布均匀性的影响还没有研究过。在这一贡献中。三种成分相似的Cu-Ni-Cr NC合金。具有原子、纳米和微米尺度的相应Cr分布，已经专门设计并使用直流磁控溅射（DCMS）、纳米复合电沉积（NCE）制备。和表面机械研磨处理（SMAT）。这些NC合金。与传统的粗晶合金对应物相比，在800摄氏度的空气中氧化期间，表现出显着增加的能力，以发展连续的氧化铬规模，导致氧化动力学显著降低。氧化行为的变化不仅与合金的小晶粒尺寸有关。位（也具有富Cr相的精细分布。在这三种方法中，DCMS和NCE的微结构显示效果优于SMAT。这些加工依赖的显微组织的形成和它们与铬选择性氧化过程的关系进行了讨论。(C)2008年电化学学会。[DOI：10.1149/1.3049345]保留所有权利。
Nanocrystallization. an alternative method for improving the high-temperature oxidation resistance of alloys by increasing the supply of the protective oxide-forming element such as Cr or Al has received considerable attention. However, for nanocrystalline (NC) alloy containing two phases, the effect of spatial distribution uniformly of the oxide-forming element oil oxidation has not been studied. In this contribution. three compositionally similar Cu-Ni-Cr NC alloys. with corresponding Cr distribution in atomic, nano-, and micrometer length scale, have been specifically designed and fabricated using direct current magnetron sputtering (DCMS), nanocomposite electrodeposition (NCE). and surface mechanical attrition treatment (SMAT). respectively These NC alloys. In Comparison to the conventional coarse-grained alloy counterpart during oxidation in air in 800 degrees C, exhibited dramatically increased ability to develop a continuous chromia scale, causing, a considerable decrease in the oxidation kinetics. The change in oxidation behavior is associated not only with the small grain size of the alloys. bit( also with the refined distribution of the Cr-rich phases. Among the three methods, microstructures developed by DCMS and NCE were more effective than that front SMAT. The formation of these processing-dependent microstructures and their relationship with the Cr-selective oxidation process are discussed. (C) 2008 The Electrochemical Society. [DOI: 10.1149/1.3049345] All rights reserved.