Solid solution strengthening of Ni3AI by B and Hf additionsReport as inadecuate




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Abstract : The yield stress of Ni3AI can be greatly increased by the addition of various ternary alloying elements. Some of these cause a more or less uniform strengthening over a range of temperatures, e.g. B., while others like Hf cause strengthening at low temperatures and a more rapid increase in the flow stress with temperature, i.e. the flow stress anomaly is increased by Hf, but not by B. The strengthening of Ni3AI by these two elements is interpreted in forms of a combination of solid solution hardening and cross-slip hardening. It is shown that Hf appears to strengthen Ni3AI by a combination of solid solution hardening and increased cross-slip leading to a decreased activation energy for cross-slip, while B appears to only strengthen by solid solution hardening.





Author: F. Heredia D. Pope

Source: https://hal.archives-ouvertes.fr/



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