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Enhancing the Ignition Hardness and Compressive Response of Magnesium by Reinforcing with Hollow Glass Microballoons

机译：通过空心玻璃微气球增强镁的点火硬度和压缩响应

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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.
机译：镁（Mg）/玻璃微气球（GMB）金属基体复合泡沫（1.47-1.67 g / cc）使用分解熔体沉积（DMD）工艺路线合成。这样的句法泡沫作为汽车，航空航天和海洋领域不断变化的需求的潜在候选材料，在科学界引起了极大的兴趣。评价合成的复合材料的微观结构，热和压缩性能。结果表明，纯Mg的显微硬度和尺寸稳定性随GMB含量的增加而增加。在Mg基质中添加25 wt％的GMB后，这些泡沫的着火响应提高了约22°C。这项工作的作者提出了一个新的参数，即着火因子，以量化已开发的镁泡沫所展现的优异的着火性能。添加GMB颗粒可提高纯Mg的室温抗压强度，Mg-25 wt％GMB的最大抗压屈服强度（CYS）为161 MPa，添加GMB的极限抗压强度（UCS）为232 MPa镁含量为5 wt％。在Mg-25wt％的GMB泡沫中实现了37.7％的最大破坏应变。与纯Mg相比，GMB颗粒的添加显着提高了压缩破坏前的能量吸收能力，使最高填充载荷达到200％。最后，详细讨论了由于存在空心GMB颗粒而导致的Mg的微观结构变化。

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