Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5455846 | Materials Science and Engineering: A | 2017 | 7 Pages |
Abstract
A new directionally solidified Ni-base superalloy, M4706, containing three different model microstructures is obtained via changing aging heat treatments. After tensile deformation at 650 °C, the microstructures are investigated by scanning electron microscope and transmission electron microscope. Experimental results reveal that the tensile strength decreases gradually with increasing mean γⲠprecipitate size from 424 to 734 nm, and plastic deformation is accomplished mainly by dislocations shearing of γⲠprecipitates in all three microstructures. Meanwhile, it is also found that as the precipitate size increases, more and more dislocations pass through both γ and γⲠphases in groups in the slightly deformed specimens. Based on these results, it is deemed that the occurrence of this deformation pattern accounts for the degeneration of the yield strength with precipitate size.
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Authors
P. Zhang, Y. Yuan, J. Li, Y.F. Xu, X.L. Song, G.X. Yang,