Spall damage of Invar alloys under shock loading: Interplay between segregation bands, grain boundaries and deformation twins
This work investigates the effect of elemental segregation bands on the spallation damage behavior of Invar 36 alloys. Plate impact recovery experiments and postmortem characterizations, as well as molecular dynamics simulations considering anisotropic segregation band structures, are conducted to r...
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| Main Authors: | , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-06-01
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| Series: | Materials & Design |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S026412752500499X |
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| Summary: | This work investigates the effect of elemental segregation bands on the spallation damage behavior of Invar 36 alloys. Plate impact recovery experiments and postmortem characterizations, as well as molecular dynamics simulations considering anisotropic segregation band structures, are conducted to reveal the underlying mechanisms. Both experimental and simulation results reveal that the orientation of the segregation bands affects the spall strength and the evolution of damage nucleation in Invar 36 alloys. Voids tend to nucleate at both Fe-rich regions and grain boundaries, with the proportion of intragranular voids increasing as the impact velocity rises. The spatial density distribution and morphologies of voids are strongly affected by the segregation bands. Abundant staggered deformation twins are found in the adjacent of the voids. This work presents a comprehensive and in-depth investigation of the coupled effects of various factors including elemental segregation, grain boundaries and deformation twinning, giving us a better understanding of the dynamic spall mechanisms of Invar 36 alloys and directions for design and optimization of new materials. |
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| ISSN: | 0264-1275 |