Szlancsik Attila, Katona Bálint, Károly Dóra, Orbulov Imre Norbert
Department of Materials Science and Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Műegyetem rakpart 3., 1111 Budapest, Hungary.
MTA⁻BME Lendület Composite Metal Foams Research Group, Műegyetem rakpart 3., 1111 Budapest, Hungary.
Materials (Basel). 2019 Feb 14;12(4):574. doi: 10.3390/ma12040574.
Aluminum alloy (Al99.5 or AlSi12)-based metal matrix syntactic foams (MMSFs) were produced by pressure infiltration with ~65 vol % Globocer filler (33 wt % Al₂O₃, 48 wt % SiO₂, 19 wt % Al₂O₃∙SiO₂). The infiltrated blocks were machined by different geometry tools in order to produce notched samples. The samples were loaded in three-point bending, and the loading force values were recorded against the cross-head displacements and the crack opening displacements. To measure up the notch sensitivity and toughness of the MMSFs, the fracture energies and the fracture toughness values were determined. The results showed that the mentioned quantities are needed to describe the behavior of MMSFs. The fracture energies were shown to be notch-sensitive, while the fracture toughness values were dependent only on the matrix material and were insensitive to the notch geometry. The complex investigation of the fracture surfaces revealed strong bonding between the hollow spheres and the Al99.5 matrix due to a chemical reaction, while this bonding was found to be weaker in the case of the AlSi12 matrix. This difference resulted in completely different crack propagation modes in the case of the different matrices.
基于铝合金（Al99.5或AlSi12）的金属基复合泡沫材料（MMSFs）通过压力浸渗法制备，其中含有约65体积%的球形陶瓷填料（33重量%的Al₂O₃、48重量%的SiO₂、19重量%的Al₂O₃∙SiO₂）。对浸渗后的块状材料使用不同几何形状的刀具进行加工，以制备带缺口的样品。对样品进行三点弯曲加载，并记录加载力值与十字头位移和裂纹开口位移的关系。为了评估MMSFs的缺口敏感性和韧性，测定了断裂能和断裂韧性值。结果表明，需要上述这些量来描述MMSFs的行为。结果显示断裂能对缺口敏感，而断裂韧性值仅取决于基体材料，对缺口几何形状不敏感。对断口表面的综合研究表明，由于化学反应，空心球与Al99.5基体之间存在强结合，而在AlSi12基体的情况下，这种结合较弱。这种差异导致在不同基体情况下裂纹扩展模式完全不同。
