Ground simulation tests of proton irradiation for Kapton films were conducted using the space synthesis irradiating facility,in which the energy of protons was chosen as 90 keV,and the flux was 5.0×1011 cm-2·s-1.After proton irradiation some bulges like fingers appears on the surface of Kapton and the surface roughness increases apparently.UV/Vis analysis demonstrates that the irradiation leads to the red shifting in the edge of optical absorption and a strong increase in absorbance in the visible region.X-ray photoelectron spectroscopy(XPS) analysis indicates that the enrichment of carbon atom due to the bond breaking and reconstruction during the irradiation results in the degradation of the optical properties.
LI Ruiqi,LI Chundong,HE Shiyu,DI Mingwei,and YANG Dezhuang Space Materials & Environment Engineering Laboratory,Harbin Institute of Technology,Harbin 150001,China
The deformation behaviors of extruded-rolled(ER)AZ31 Mg alloys with different rolling reduction and heat treatment were investigated.The results show that the accumulation of rolling reduction increases the density of twins,and refines the grain structures,which are in accordance with the enhanced strength and degraded plasticity.Tensile strength and plasticity of the alloy depend mainly on rolling reduction,while heat treatment temperature plays a more important role than heat treatment time at the same rolling reduction.With the increase of rolling reduction,the plasticity becomes more sensitive than strength on heat treatment. Recrystallization of extruded-rolled alloys will occur easily with deformation increasing,which is induced by addition of distortion energy.
