Research on Micromechanical Properties of HATO and RDX Crystals
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摘要:利用纳米压痕技术表征了HATO和RDX晶体最大生长面的硬度和弹性模量，计算了加载功、卸载功、压入功恢复率，并通过原位探针扫描成像技术研究了断裂行为。结果表明：HATO和RDX晶体的弹性模量分别为35.28GPa和22.90GPa，硬度分别为1.14GPa和0.70GPa，说明HATO相较于RDX抵抗变形的能力强；HATO的加载功比RDX小，说明HATO在受到外界载荷后的应变率更小，HATO的压入功恢复率比RDX大，表明HATO在移除外界作用力后能够更多地释放能量；在载荷为5 500μN时，HATO出现了明显的裂纹，而RDX未出现裂纹，表明HATO相对于RDX更显脆性，在受到外界冲击时更易碎裂。
Abstract:The hardness and elastic modulus of the maximum growth surface of HATO and RDX crystals were characterized by nanoindentation technology. The loading work, unloading work and indentation recovery rate were calculated. And the fracture behavior was studied by in-situ probe scanning imaging technology. The results show that the elastic modulus of HATO and RDX crystals are 35.28GPa and 22.90GPa respectively, and the hardness is 1.14GPa and 0.70GPa, indicating that HATO has a stronger ability to resist deformation than RDX. The loading work of HATO is less than that of RDX, indicating that the strain rate of HATO under external load is smaller. The recovery rate of loading work of HATO is higher than that of RDX, which shows more energy can be released after removing external force. When the load is 5 500μN, HATO appears obvious crack and RDX doesn’t, which indicates that HATO is more brittle and easier to crack under external impact.
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