The effect of the local chemical composition of grain boundaries on the corrosion resistance of a titanium alloy
| Autor: | M. K. Chegurov, V. I. Kopylov, N. G. Sandler, N. Yu. Tabachkova, N. A. Kozlova, P. V. Tryaev, E. S. Smirnova, V. N. Chuvil’deev, A. S. Mikhailov, A. M. Bakhmet’ev, A. V. Nokhrin |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Physics and Astronomy (miscellaneous) 020502 materials Metallurgy Alloy 02 engineering and technology Intergranular corrosion engineering.material 01 natural sciences Corrosion 0205 materials engineering Impurity 0103 physical sciences Galvanic cell engineering Grain boundary Chemical composition Grain boundary strengthening |
| Zdroj: | Technical Physics Letters. 43:5-8 |
| ISSN: | 1090-6533 1063-7850 |
| Popis: | The influence of the structural-phase state of grain boundaries in a Ti4Al2V (commercial PT3V grade) pseudo-alpha-titanium alloy on its susceptibility to hot-salt intergranular corrosion (IGC) has been studied. It is established that IGC-tested alloy samples exhibit corrosion-induced defects of two types. More extended defects of the first type occur at the V-rich boundaries of coarse grains, while short defects of the second type reside at the grain boundaries with composition close to that of the grain body. The existence of the two types of IGC defects is explained by the classical theory of galvanic microcouples (microcells), according to which the IGC intensity is proportional to the difference of corrosion-active impurity concentrations between the grain boundary and body. |
| Databáze: | OpenAIRE |
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