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Achieving quadruple performance enhancement in biodegradable Zn-Fe alloys via accumulative cooling and interface fusion(ACIF) 认领 引用
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作者 Wei Gou Qiang Wang +5 位作者 Zhang-Zhi Shi Yuman Zhu Jia-You Zhang Shan-Peng Zhao Hai-Jun Zhang Lu-Ning Wang 《Rare Metals》 SCIE EI CAS CSCD 2025年第12期10887-10900,共14页
Theoretically,cooling rate decreases exponentially as solidification thickness increases.This leads to coarse second-phase particles in Zn alloys,which not only impairs mechanical properties but also exacerbates degra... Theoretically,cooling rate decreases exponentially as solidification thickness increases.This leads to coarse second-phase particles in Zn alloys,which not only impairs mechanical properties but also exacerbates degradation nonuniformity.To address this common issue,we have developed accumulative-cooling and interface-fusion(ACIF) technology that maintains a high cooling rate regardless of increased solidification thickness.Using Zn-0.4Fe as a model alloy,the accumulative-cooling process achieves an average cooling rate of 817℃ min-1,approximately 68 times that of air cooling.After extrusion,the average size of FeZn13 particles is refined from 29.4 to 0.4 μm,reaching the highest level of refinement in Zn alloys.As a result,a quadruple enhancement of Zn-0.4Fe model alloy has been achieved:Ultimate tensile strength enhanced 1.6-fold to 265 MPa(the highest among Zn-Fe alloys),elongation enhanced from 29% to 48%,corrosion uniformity improved 3 times,and cell viability of mouse embryonic osteoblast precursor cells(MC3T3-E1)increased by 20%.A long rod is obtained via ACIF,overcoming the limitation that fast-cooled Zn alloys could only be produced in thin plate form.This enables the possibility of fabricating bone screws and vascular stents using bulk Zn alloys with fine second-phase particles.From a technical standpoint,this technique can be widely applied to a variety of metallic materials. 展开更多
关键词 Biodegradable Zn alloys Microstructure refinement Mechanical properties Corrosion uniformity Cell viability
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