Zhao, Rui
(i-cube center, ERI, ReCAPT, School of Nano & Advanced Materials Science and Engineering, Gyeongsang National University)
,
Li, Yuxuan
(i-cube center, ERI, ReCAPT, School of Nano & Advanced Materials Science and Engineering, Gyeongsang National University)
,
Jeong, Seung-Reuag
(i-cube center, ERI, ReCAPT, School of Nano & Advanced Materials Science and Engineering, Gyeongsang National University)
,
Yue, Xuezheng
(i-cube center, ERI, ReCAPT, School of Nano & Advanced Materials Science and Engineering, Gyeongsang National University)
,
Hur, Bo-Young
(i-cube center, ERI, ReCAPT, School of Nano & Advanced Materials Science and Engineering, Gyeongsang National University)
Melt foaming method is one of cost-effective methods to make metal foam and it has been successfully applied to fabricate Mg foams. In this research, AZ31 Mg alloy ingot was used as a metal matrix, using AlCa granular as thickening agent and $CaCO_3$ powder as foaming agent, AZ31 Mg alloy...
Melt foaming method is one of cost-effective methods to make metal foam and it has been successfully applied to fabricate Mg foams. In this research, AZ31 Mg alloy ingot was used as a metal matrix, using AlCa granular as thickening agent and $CaCO_3$ powder as foaming agent, AZ31 Mg alloy foams were fabricated by melt-foaming method at different foaming temperatures. The porosity was above 41.2%~73.3%, pore size was between 0.38~1.52 mm, and homogenous pore structures were obtained. Microstructure and mechanical properties of the AZ31 Mg alloy foams were investigated by optical microscopy, SEM and UTM. The results showed that pore structure and pore distribution were much better than those fabricated at lower temperatures. The compression behavior of the AZ31 Mg alloy foam behaved as typical porous materials. As the foaming temperature increased from $660^{\circ}C$ to $750^{\circ}C$, the compressed strength also increased. The AZ31 Mg alloy foam with a foaming temperature of $720^{\circ}C$ had the best energy absorption. The energy absorption value of Mg foam was 15.52 $MJ/m^3$ at a densification strain of 52%. Furthermore, the high energy absorption efficiencies of the AZ31 Mg alloy foam kept at about 0.85 in the plastic plateau region, which indicates that composite foam possess a high energy absorption characteristic, and the Vickers hardness of AZ31 Mg alloy foam decreased as the foaming temperature increased.
Melt foaming method is one of cost-effective methods to make metal foam and it has been successfully applied to fabricate Mg foams. In this research, AZ31 Mg alloy ingot was used as a metal matrix, using AlCa granular as thickening agent and $CaCO_3$ powder as foaming agent, AZ31 Mg alloy foams were fabricated by melt-foaming method at different foaming temperatures. The porosity was above 41.2%~73.3%, pore size was between 0.38~1.52 mm, and homogenous pore structures were obtained. Microstructure and mechanical properties of the AZ31 Mg alloy foams were investigated by optical microscopy, SEM and UTM. The results showed that pore structure and pore distribution were much better than those fabricated at lower temperatures. The compression behavior of the AZ31 Mg alloy foam behaved as typical porous materials. As the foaming temperature increased from $660^{\circ}C$ to $750^{\circ}C$, the compressed strength also increased. The AZ31 Mg alloy foam with a foaming temperature of $720^{\circ}C$ had the best energy absorption. The energy absorption value of Mg foam was 15.52 $MJ/m^3$ at a densification strain of 52%. Furthermore, the high energy absorption efficiencies of the AZ31 Mg alloy foam kept at about 0.85 in the plastic plateau region, which indicates that composite foam possess a high energy absorption characteristic, and the Vickers hardness of AZ31 Mg alloy foam decreased as the foaming temperature increased.
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가설 설정
8. The results of SEM-EDS analysis of cell microstructure of AZ31 Mg alloy foam of foaming temperature of 720℃, (a) SEM micrographs of the AZ31 Mg alloy foam and (b) EDS of the AZ31 Mg alloy foam.
1) In order to obtain Mg alloy foam with fine pore structures and high porosity (68%~73%), the foaming temperature should be selected in the range of 690℃~720℃.
2) Compression behavior of AZ31 Mg alloy foam shows typical porous materials. As the foaming temperature increased from 660℃ to 750℃, the compressed strength also increased.
대상 데이터
Granular AlCa (99.8 wt.%) was used as the thickening agent and the as-received CaCO3 powder (Table 2) (purity >99.85 wt.%, about 4 µm) was chosen as the foaming agent.
성능/효과
3) Vickers hardness of AZ31 Mg alloy foams were decreased as the foaming temperature increased.
In this paper, the AZ31 Mg alloy foams with the porosity of 41.2%~73.3% were fabricated by melt-foaming method. Besides, the microstructure, mechanical properties and energy absorption were investigated and discussed.
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