Effect of graphene nanosheets on the pore structure and compressive mechanical properties of aluminum-magnesium matrix composite foams
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摘要: 采用机械球磨结合粉末冶金发泡法制备了石墨烯纳米片(GNSs)增强Al-Mg基复合泡沫(G-AMCFs),研究了GNSs对泡沫Al-Mg泡孔形貌、微观组织及准静态压缩力学性能的影响。结果表明,GNSs的加入增加了气孔的形核位点并使MgO在GNSs周围发生偏析。随着GNSs含量的增加,G-AMCFs的泡孔孔径增大;0.25wt%G-AMCFs的压缩力学性能最优,相比于泡沫Al-Mg,其吸能能力提高了43.6%,压缩强度提高了42.9%,平台应力提高了28.1%,同时表现出良好的韧性变形行为。高含量G-AMCFs(0.75wt%)的泡孔结构发生恶化并导致力学性能降低,但压缩强度仍优于泡沫Al-Mg。G-AMCFs的强化方式主要为弥散强化、载荷传递和沉淀强化。Abstract: Graphene nanosheets (GNSs) reinforced Al-Mg matrix composite foams (G-AMCFs) were successfully prepared by ball milling and powder metallurgy foaming. The effects of GNSs on pore morphology, microstructure and quasi-static compressive mechanical properties of Al-Mg foams were studied. The results show that the addition of GNSs can increase pore nucleation sites and cause the segregation of MgO around the GNSs. With the increment of GNSs content, the pore size of G-AMCFs increases. The compressive mechanical properties of 0.25wt%G-AMCFs are the best. Compared with Al-Mg foams, the energy absorption capacity, yield strength and plateau stress of 0.25wt%G-AMCFs are increased by 43.6%, 42.9% and 28.1%, respectively. Meanwhile, 0.25wt%G-AMCFs show good ductile deformation behavior. The cell structure with high content of G-AMCFs (0.75wt%) deteriorates which leads to a decrease in mechanical properties, but the yield strength is still higher than that of Al-Mg foams. The enhancement mechanism of composite foams includes dispersion strengthening, load transfer and precipitation strengthening.
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图 9 0.25wt%G-AMCFs ((a)~(d)) 和0.75wt%G-AMCFs ((e)~(h)) 的准静态压缩变形行为:((a), (e)) 应变ε=0%;((b), (f)) ε=5%;((c), (g)) ε=10%;((d), (h)) ε=40%
Figure 9. Quasi-static compression deformation behavior of 0.25wt%G-AMCFs ((a)-(d)) and 0.75wt%G-AMCFs ((e)-(h)): ((a), (e)) Strain ε=0%; ((b), (f)) ε=5%; ((c), (g)) ε=10%; ((d), (h)) ε=40%
表 1 不同GNSs含量的G-AMCFs的力学性能统计值
Table 1. Statistical values of mechanical properties of G-AMCFs with different GNSs contents
Foams σs/MPa σpl/MPa W/(MJ·m−3) AFs 4.9 5.7 3.67 0.25wt%G-AMCFs 7.0 7.9 5.27 0.50wt%G-AMCFs 7.1 7.3 4.69 0.75wt%G-AMCFs 5.8 7.0 4.74 Notes: σs—First maximum stress on the stress-strain curve; σpl—Average compressive stress of the compressive strain interval of 20% to 40%; W—Energy value obtained by the integration of the region from 0 to εd; εd—Densification strain. -
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