MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 卷:216 |
Oxidation behavior of equiatomic TiNi alloy in high temperature air environment | |
Article | |
Chu, CL ; Wu, SK ; Yen, YC | |
关键词: isothermal oxidation test; TiNi alloy; oxidation kinetics; | |
DOI : 10.1016/0921-5093(96)10409-3 | |
来源: Elsevier | |
【 摘 要 】
The isothermal oxidation behavior of equiatomic TiNi shape memory alloy in dry air from 550 to 1000 degrees C is studied with thermogravimetric analysis. The alloy's scale layer is further investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe microanalyzer. Experimental results indicate that a multi-layered scale is formed, consisting of an outer rutile layer, a porous intermediate layer of mixture of TiO2 and Ni(Ti), and a thin inner TiNi3 layer. The intermediate layer, furthermore, exhibits a stripe-like lamellar structure at the TiNi3 interface. The apparent activation energy of TiNi alloy oxidation is 226 kJ/mol, and the oxidation rate follows a parabolic law. A schematic oxidation mechanism of TiNi alloy is proposed to explain the observed results.
【 授权许可】
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【 预 览 】
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