Microstructure Investigation For TATB And Al-based, Mg-based Alloy By Small Angle Scattering Method

Small Angle Scattering(SAS) technique can be used to measure and investigate microstructure in the size of several nanometers up to hundreds of nanometers. Nowadays, SAS technique is considered as an indispensable method for nanoscale investigation, causing it's versatile and advantages including good statistics, easy sample preparation, sufficient information, various material investigations etc. To aim at studying and practicing SAS theory, experimental methods and data treatment process, we employed Small Angle X-ray Scattering(SAXS) to investigate pores in insensitive high explosive materials TATB powders and Small Angle Neutron Scattering(SANS) to investigate variation of nanoscale defects in Al-based and Mg-based alloys after dynamic loading treatment. The concrete contents are as follows:By Synchrotron SAXS method, we investigated pores in TATB powders which produced by different methods and different producing time for re-crystallized method. The microstructure information we obtained about pores in TATB powders included average pore-radii, number distribution, surface and interface characters etc. The results revealed that in TATB powders, different producing methods can lead to big difference pores respectively. Combining with the results of Scan Electron Microscope(SEM), we improved our spherical model as cylindrical model when analyzing the results of SAXS data and obtained corresponding microstructure parameters.Applied by SANS method, we investigated the defects variation in the range of 10nm to 160nm in Al-based and Mg-based alloys after treated by dynamical loading. The SANS results proved the dynamic loading treatment can differently affect the form and magnitude of defects in Al-based and Mg-based alloys. Specially, for Mg-based alloy, the form and magnitude of defects significantly changed and produced big amount of nanoscale defects after loading. But for Al-based alloy, the change of defects was not very obvious. The conclusions drawn from SANS can be proved by SEM investigation. Based on alloys' structural characters, we showed explanations for the SANS results.