Fabrication of Vapor-Grown Carbon Fiber-Reinforced Magnesium-Calcium Alloy Composites by Compo-Casting Process
Fabrication of Vapor-Grown Carbon Fiber-Reinforced Magnesium-Calcium Alloy Composites by Compo-Casting Process
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DOI：
10.2320/matertrans.mbw201607
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发表时间：
2017-04
影响因子：
1.2
通讯作者：
Youqiang Yao;Zhefeng Xu;K. Sugio;Yongbum Choi;K. Matsugi;Shaoming Kang;R. Fu;G. Sasaki
中科院分区：
文献类型：
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作者：
Youqiang Yao;Zhefeng Xu;K. Sugio;Yongbum Choi;K. Matsugi;Shaoming Kang;R. Fu;G. Sasaki
采用复合铸造工艺制备了镍包覆气相生长碳纤维增强镁钙合金复合材料。然后，研究了复合材料的显微组织和力学性能。Mg- 5al - 3ca （AX53）合金表现出沿晶界沿粗层状（Mg, Al）2Ca相的枝晶组织，而不是Mg- 5al合金中不规则的β-Mg17Al12相。对于0.5% ni包覆的vgcf增强AX53合金复合材料，vgcf在基体中分散良好，镍包覆向金属中扩散。Al3Ni化合物在晶粒内部和晶界上均有形成。与Mg-5Al合金相比，AX53合金的极限抗拉强度（UTS）和应变硬化在断口处均有显著提高。此外，当添加0.5%的vgcf时，复合材料的UTS增加，同时总伸长率增加，这主要归因于大应变期间的应变硬化。由于引入少量ni包覆的VGCFs，其0.2%屈服应力略有改善。然而，1.0% vgcf增强的AX53合金复合材料的伸长率下降，导致强度较低，与AX53合金相似。(doi: 10.2320 / matertrans.MBW201607)
Magnesium-calcium alloy composites reinforced with nickel-coated vapor-grown carbon bers (VGCFs) were fabricated using a compo-casting process. Then, the microstructures and mechanical properties of these composites were investigated. The Mg-5Al-3Ca (AX53) alloy exhibited a dendritic microstructure with a coarse lamellar (Mg, Al)2Ca phase along the grain boundaries instead of the irregular β-Mg17Al12 phase found in the Mg-5Al alloy. For the 0.5% Ni-coated VGCF-reinforced AX53 alloy composite, the VGCFs were well dispersed in the matrix, with the nickel coating diffused into the metal. Al3Ni compounds formed both inside the grains and on the grain boundaries. The ultimate tensile strength (UTS) and strain-hardening of the AX53 alloy, in comparison with the Mg-5Al alloy, were improved signi cantly to the point of fracture. Furthermore, an increase in the UTS of the composite was achieved with the addition of 0.5% VGCFs, along with an increase in the total elongation, which could mainly be attributed to the strain hardening during a larger strain. The 0.2% yield stress was slightly improved as a result of the small amount of introduced Ni-coated VGCFs. However, the elongation dropped for the 1.0% VGCF-reinforced AX53 alloy composites, which led to a low strength similar with that of the AX53 alloy. [doi:10.2320/matertrans.MBW201607]