| Autor: |
Rielli, Vitor Vieira, Theska, Felix, Yao, Yin, Best, James P., Primig, Sophie |
| Předmět: |
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| Zdroj: |
Materials Research Letters; May2022, Vol. 10 Issue 5, p301-309, 9p |
| Abstrakt: |
Experimental differentiation of individual strengthening effects from the nanoscale precipitates in Alloy 718 remains challenging due to co-precipitation of γ′ and γ′′. Here, we examine a region adjacent to the δ-phase consisting of γ-matrix containing γ′-precipitates only. The width and compositional profile of this γ′′-free zone is uncovered via high-resolution characterization. Nanomechanical analyses reveal that the lack of γ′′-precipitates lower the hardness of the γ′′-free zone by 10–20%, while the δ-phase is found to be ∼80% harder than the γ-matrix. These findings may guide mechanical modelling and microstructural engineering of stronger superalloys critical to aerospace industry. First experimental evidence of hardness reduction in γ′′-free zone close to the δ-phase boundary, highlighting the strengthening effect of γ′′-precipitates. Previously unknown mechanical properties of the δ-phase are reported. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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