Quasi-Static Compressive Performance And Behaviors Of TI_f/Al Composites Under Ultra Hypervelocity Impact

The background of this study is the space debris of aircraft, which designed and made two kinds of Tif/Al compostie materials volume fraction15% and 55%. It makes use of stage light gas gun, thermal simulation testing machine, optical microscope, SEM and TEM to analyse and study the static compressive properties of these two kinds of Tif/Al compostie materials and the thick target of volum 15% Tif/Al compostie materials, the performance against hypervelocity impact, macro damage and micro tissue of 55% Tif/Al compostie materials, which makes new development for the theory of designing composite high-speed impact resistance, putts new ideas for the manufacturing technology and optimizing performance optimization.During the test of quasi-static compression. We found that the compressive strength of Tif/Al compostie materials decreases as the temperature goes up, as the volum percentage of Fiber reinforcement's increase, it can increase the compressive strength of Tif/Al. From the result of the test, 15% Tif/Al compostie materials will break fragily when temeperature is very low, then when temperature over 250℃, it will upsetting and can form a lot of recrystallization grains in the organization. 55% Tif/Al compostie materials will breaks easily when it has a lot of Ti-Al material.Hypervelocity impact damage of Tif/Al compostie materials are mainly making holes and spallations, the 55% Tif/Al compostie materials will also cracking big area besides the Impact surface besides the above,during the test, 15% Tif/Al compostie materials will have back avalanche when 3mm pellet hit at the rate of 5.5km/s. crater bottom A1 grains plastic deformation is clear and has melting traces, Ti fiber will break at the direction of 45°, most of crater bottom Ti fiber plastic deformation. All the testing datas shows that hypervelocity impact crater size will increase as the pellet diameter increase and impact rates increase. And Ti fiber of adiabatic shear bands the crater bottom will be obvious in the 55% Tif/Al compostie materials, adiabatic shear bands'microvoid and will gather and grow and finally makes macro-defect.