Enhancing the Ignition, Hardness and Compressive Response of Magnesium by Reinforcing with Hollow Glass Microballoons.
Enhancing the Ignition, Hardness and Compressive Response of Magnesium by Reinforcing with Hollow Glass Microballoons.
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DOI：
10.3390/ma10090997
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发表时间：
2017-08-25
期刊：
影响因子：
--
通讯作者：
Gupta M
中科院分区：
文献类型：
--
作者：
Manakari V;Parande G;Doddamani M;Gupta M
采用分解熔融沉积(DMD)法制备了镁(Mg)/玻璃微球(GMB)金属基复合泡沫材料(1.47~1.67g/cc)。作为汽车、航空航天和海洋领域不断变化的需求的潜在候选材料，这种句法泡沫引起了科学界的极大兴趣。对合成的复合材料的微观结构、热性能和压缩性能进行了评价。结果表明，随着GMB含量的增加，纯镁的显微硬度和尺寸稳定性提高。在镁基质中加入25wt%的GMB，这些泡沫的着火响应提高了~22℃。作者提出了一个新的参数，即点火因子，来量化所开发的泡沫镁所表现出的优越的点火性能。纯镁的室温抗压强度随GMB含量的增加而提高，当GMB的加入量为5wt%时，Mg-25wt%GMB的最大抗压屈服强度(CyS)为161 Mpa，极限抗压强度(Ucs)为232 Mpa。镁-25wt%GMB泡沫的最大破坏应变为37.7%。与纯镁相比，GMB颗粒的加入显著提高了最高填充量压缩破坏前的能量吸收~200%。最后，详细讨论了由于空心GMB颗粒的存在而引起的镁的微观结构变化。
Magnesium (Mg)/glass microballoons (GMB) metal matrix syntactic foams (1.47–1.67 g/cc) were synthesized using a disintegrated melt deposition (DMD) processing route. Such syntactic foams are of great interest to the scientific community as potential candidate materials for the ever-changing demands in automotive, aerospace, and marine sectors. The synthesized composites were evaluated for their microstructural, thermal, and compressive properties. Results showed that microhardness and the dimensional stability of pure Mg increased with increasing GMB content. The ignition response of these foams was enhanced by ~22 °C with a 25 wt % GMB addition to the Mg matrix. The authors of this work propose a new parameter, ignition factor, to quantify the superior ignition performance that the developed Mg foams exhibit. The room temperature compressive strengths of pure Mg increased with the addition of GMB particles, with Mg-25 wt % GMB exhibiting the maximum compressive yield strength (CYS) of 161 MPa and an ultimate compressive strength (UCS) of 232 MPa for a GMB addition of 5 wt % in Mg. A maximum failure strain of 37.7% was realized in Mg-25 wt % GMB foam. The addition of GMB particles significantly enhanced the energy absorption by ~200% prior to compressive failure for highest filler loading, as compared to pure Mg. Finally, microstructural changes in Mg owing to the presence of hollow GMB particles were elaborately discussed.
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