Titanium alloy is an important structural support material for remote sensing spacecraft propulsion systems. In the face of increasingly serious threat from space debris, exploring the dynamic mechanical properties of new titanium alloy materials is one of the important technologies for spacecraft protection in space. Dynamic compression tests were conducted by Split Hopkinson Pressure Bar (SHPB) apparatus combined with heating techniques to study Ti-5553 titanium alloy with equiaxed microstructure and duplex microstructure under high strain rate and high temperature loading conditions. The testing temperature is set as 200℃, 400℃ and 600℃ and the strain rate is 1200s-1 and 2500s-1 respectively. The results have showed that under the condition of high temperature and high strain rate, bimodal structure and equiaxed structure of Ti-5553 titanium alloy present similar mechanical behavior, i.e. flow stress drops with the increasing of experimental temperature, strain remain unchanged. When the temperature is lower than 200℃, the temperature sensitivity of the bimodal structure is higher than that of the equiaxed structure, and the plastic absorption work is lower than that of the equiaxed structure, showing a higher adiabatic sensitivity; when the temperature is higher than 200℃, the temperature sensitivity of equiaxed microstructure is higher than that of bimodal microstructure; the plastic absorption work is less than that of the bimodal structure, showing a higher adiabatic sensitivity; both structures of Ti5553 titanium alloy have shear failure at high temperature and high strain rate. The phase of α is elongated and refined along the shear direction. The obtained dynamic mechanical properties of the new Ti-5553 titanium alloy can provide basic data for spacecraft protective structure design.
XU Xin
,
WANG Lin
,
WANG Rui-xian
,
HU Yong-qiang
,
GONG Zi-zheng
,
ZHANG Pin-liang
. Dynamic Mechanical Properties of Ti-5553 Titanium Alloy Under High Temperature and High Strain Rate Loading[J]. Journal of Space Science and Experiment, 2023
, 23(3)
: 61
-69
.
DOI: 10.19963/j.cnki.2096-4099.2023.03.007
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