摘要
The development of a new generation of high-performance Al alloys,achieved through Sc/Zr-modified Al-Mg-based alloys,is attracting growing attention.However,the significant cost associated with Sc presents a barrier to further advancement.In this study,the inclusion of trace heterogeneous TiB_(2)particles is employed to regulate the microstructural evolution process,thereby achieving high-performance aluminum alloys with optimal strength-ductility characteristics with minimal Sc addition.The ultimate tensile strength of Al-Mg-Sc-Zr-TiB_(2)alloy reached 442.4 MPa,with a elongation of 16.6%.The combined impact of TiB_(2)particles and Al_(3)(Sc,Zr)precipitates on the microstructure evolution of the Al-Mg alloy during hot deformation was investigated.It was observed that spherical Al_(3)(Sc,Zr)precipitates with sizes ranging from 5 to 10 nm dispersed in the matrix,during the hot deformation process,functioned as Zener pinning sites for dislocations,thus increasing the proportion of low-angle grain boundaries(LAGBs)and suppressing the dynamic recrystallization(DRX)process.The incorporation of trace TiB_(2)particles induced the particle-stimulated nucleation effect,accelerating DRX and refining the microstructure.The density of LAGBs further increased,and the proportion of continuous dynamic recrystallization also rose.Furthermore,the TiB_(2)particles mitigated the anisotropy of material and inhibited DRX grain growth,thereby expanding the subsequent processing window and offering more potential applications for the materials.This study provides new insights into the production of high-performance Al alloy products.
基金
supported by the National Key Research and Development Program of China(No.2022YFB3400142)
the National Natural Science Foundation of China(Nos.52174356,51971051 and U22A20174)
the Science and Technology Plan Project of Liaoning Province(Nos.2022010005-JH6/1001 and 2022JH2/1013)
the Major Science and Technology Projects of Longmen Laboratory(No.231100220400)
the Fundamental Research Funds for the Central Universities.
