A novel micro-vibration sensitive-type high-damping AI matrix composites reinforced with Li7-xLa3Zr2-xNbxO12 （LLZNO, x = 0.25） was designed and prepared using an advanced spark plasma sintering （SPS） technique. The damping capacity and mechanical properties of LLZNO/AI composites （LLZNO content： 0-40 wt.%） were found to be greatly improved by the LLZNO addition. The maximum damping capacity and the ultimate tensile strength （UTS） of LLZNO/AI composite can be respectively up to 0.033 and 101.2 MPa in the case of 20 wt.% LLZNO addition. The enhancement of damping and mechanical properties of the composites was ascribed to the intrinsic high-damping capacity and strengthening effects of hard LLZNO particulate. This investigation provides a new insight to sensitively suppress micro-vibration of payloads in the aerospace environment.
Hardening and elemental segregation of T91 martenstic steel irradiated by 10 MeV Cl ions to doses from 0.06 dpa to 0.83 dpa were investigated with the nanoindentation technique and transmission electron microscopy（TEM）.The results demonstrated that the irradiation hardening was closely related with irradiation dose.By increasing the dose,the hardness increased rapidly at first from the initial value of 3.15 GPa before irradiation,and then tended to saturate at a value of 3.58 GPa at the highest dose of 0.83 dpa.Combined with TEM observation,the mechanism of hardening was preliminary attributed to the formation of M（Fe,Cr）23C6 carbides induced by the high energy Cl-ion irradiation.
