不同温度下2种钨结构增强Zr基非晶合金的动态压缩性能

利用SHPB装置对钨丝增强Zr基非晶复合材料和钨骨架增强Zr基非晶复合材料进行了3种环境温度下多种应变率的动态压缩性能测试。比较了2种材料的动态力学性能,发现二者均具有应变率敏感性和较强的塑性变形能力。但二者承载机制存在较大差异。钨丝增强结构变形主要表现在钨丝的失稳,由数值模拟初步分析了这种局部结构失稳控制的变形以及热失稳现象;钨骨架增强结构变形前期钨骨架起主要承载作用,而不是各成分的共同作用,这导致材料的屈服强度比纯非晶和纯钨的低。

Dynamic compressive properties of two tungsten structure reinforced Zr-based metallic glass composites at different temperatures

Tungsten structure reinforced composites are materials that the tungsten structure is embedded into the metallic glass to prevent the shear bands from developing in the metallic glass. In order to expand their application and understand their mechanical properties, dynamic compression tests were performed for two Zr-based metallic glass composites reinforced by tungsten fiber and porous tungsten, respectively, by using a SHPB device at three different temperatures and various strain rates. Comparison of the dynamic mechanical properties between the two composites reveals that they both have considerable stain rate sensitivity and excellent plastic deformation ability, but they have different deformation mechanisms. The deformation of the tungsten fiber reinforced Zr-based metallic glass composite is due to the local structure instability or thermal instability of tungsten fibers. And this phenomenon was numerically simulated. On the other hand, the loading of the porous tungsten reinforced Zr-based metallic glass composite at the beginning is mainly carried by tungsten skeleton rather than the combined action of the components, which makes the yield stress of the porous tungsten reinforced composite smaller than those of both pure Zr-based metallic glass and pure tungsten.