Effect of crystallization behavior on the oxidation resistance of a Zr–Al–Cu metallic glass below the crystallization temperature
Effect of crystallization behavior on the oxidation resistance of a Zr–Al–Cu metallic glass below the crystallization temperature
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DOI：
10.1016/j.jnoncrysol.2006.04.003
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发表时间：
2006-08
影响因子：
3.5
通讯作者：
Y. Wu;T. Nagase;Y. Umakoshi
中科院分区：
文献类型：
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作者：
Y. Wu;T. Nagase;Y. Umakoshi
Zr65.0Al7.5Cu27.5（at.%）的晶化行为研究了753和1053 K退火处理对金属玻璃在623和663 K过冷液相区抗氧化性的影响。在753 K退火的试样中观察到bct-Zr 2Cu析出相，而在1053 K退火的试样中观察到bct-Zr 2Cu和Zr 2Al的双相结构。试样的抗氧化性取决于结晶析出物的数量。无论暴露温度如何，退火试样的抗氧化性均高于快淬试样，尤其是在1053 K退火的试样。从基体中形成大量的bct-Zr 2Cu和Zr 2Al晶相是提高抗氧化性的原因，因为它们具有更高的抗氧化性，并促进了Al 2 O3和铜氧化物的发展。长时间暴露后的非晶合金的氧化物成分依赖于温度。在623 K下，快淬试样的氧化物由大量的CuO、少量的四方相和单斜相ZrO 2、少量的Cu 2 O和少量的Al 2 O3组成。而在663 K下，氧化皮中Cu ~（3+）以氧化态存在。
The crystallization behavior of Zr65.0Al7.5Cu27.5(at.%) metallic glass with 753 and 1053K annealing treatment and its effect on oxidation resistance around the supercooled liquid region at 623 and 663K was studied. The crystalline phase of bct-Zr2Cu precipitates for the specimen annealed at 753K was observed, while duplex structures of bct-Zr2Cu and Zr2Al formed in the specimen annealed at 1053K. The oxidation resistance of the specimen depended on the amount of crystalline precipitates. Regardless of the exposure temperature, the annealed specimens showed higher oxidation resistance than the melt-spun one, especially for the specimen annealed at 1053K. The formation of numerous crystalline phases of bct-Zr2Cu and Zr2Al from the matrix was responsible for improving the oxidation resistance due to their higher oxidation resistance and promotion of the development of Al2O3and oxides of copper. The oxide constituents of the amorphous alloy after long exposure depended on the temperature. The oxide was composed of a large amount of CuO, some tetragonal and monoclinic-ZrO2and a minor amount of Cu2O as well as a slight amount of Al2O3for the melt-spun specimen during exposure at 623K. Under the 663K exposure, however, the oxide state of Cu3+in the scale was also detected.