Abstract
During the forming-reaction integrated process of NiAl alloy thin-walled components, Ni/Al laminates exhibit a complicated deformation behavior. In the present study, a physical-based constitutive model for the preparation of an Ni/Al laminate by vacuum hot-pressing was developed, with consideration of the load-bearing effect and microcracks in the diffusion layers, interface strengthening, and back stress strengthening. The load-bearing effect of the diffusion layer and interface strengthening increased the overall flow stress of the Ni/Al laminate, but did not affect the strain hardening rate. Multiple microcracks in the diffusion layer result into a gradual increase in the strain-softening effect. Unlike in other metal laminates, back stress only exists in the Al layers of an Ni/Al laminate. A gradually increasing back stress can significantly increase the flow stress and strain hardening rate at a strain of less than 0.085, and a gradually decreasing back stress leads to a reduction in the strain hardening rate. Ni/Al laminates with diffusion layers of various thicknesses was used to further verify the robustness of the constitutive model.
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Acknowledgments
This work was financially supported by Program for Heilongjiang Touyan Team (No. HITTY-20190015), National Natural Science Foundation of China (No. 52205345).
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JZ: Conceptualization, Writing—original draft. BW: Formal analysis, Data curation. TG: Formal analysis, Writing—review and editing. KW: Writing—review and editing. DW: Supervision, Writing—review and editing. GL: Funding acquisition, Project administration.
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Zhao, J., Wang, B., Gao, T. et al. Modeling the Effect of Diffusion Layer and Interface on the Flow Stress for a Ni/Al Laminate Prepared by Vacuum Hot Pressing. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09309-6
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DOI: https://doi.org/10.1007/s11665-024-09309-6