-1的范圍內(nèi)，對(duì)Ti6321鈦合金進(jìn)行動(dòng)態(tài)壓縮試驗(yàn)，研究溫度和應(yīng)變速率對(duì)材料力學(xué)性能和變形行為的影響。采用光學(xué)顯微鏡（OM）、透射電子顯微鏡（TEM）和電子背散射衍射（EBSD）表征和分析了合金的微觀結(jié)構(gòu)演變。結(jié)果表明，隨著溫度的降低和應(yīng)變速率的增加，Ti6321鈦合金的動(dòng)態(tài)屈服強(qiáng)度和平均流動(dòng)應(yīng)力均增大，而斷裂應(yīng)變明顯降低。采用Johnson-Cook本構(gòu)方程預(yù)測(cè)了Ti6321鈦合金在低溫高應(yīng)變速率下的力學(xué)行為，擬合結(jié)果與實(shí)驗(yàn)結(jié)果吻合較好。微觀結(jié)構(gòu)分析表明，隨著變形溫度的降低，｛112｝和｛101｝2種孿晶的含量明顯增加，即變形機(jī)制逐漸由孿晶的輔助作用轉(zhuǎn)變?yōu)閷\晶占主導(dǎo)地位。;Dynamic compression tests of Ti6321 titanium alloy were carried out in the temperature range from 193 K to 298 K and strain rate range from 2000 s-1 to 3000 s-1 to study the effects of temperature and strain rate on the mechanical properties and deformation behavior of the alloy. The microstructure evolution was observed and analyzed by optical microscope (OM), transmission electron microscope (TEM) and electron backscatter diffraction (EBSD). The results show that with decreasing temperature and increasing strain rate, dynamic yield strength and average flow stress of Ti6321 titanium alloy increase, while the fracture strain decreases obviously. Johnson-Cook constitutive equation is used to predict the mechanical behavior at low temperatures and high strain rates, and the fitting results are in good agreement with the experimental ones. Microstructural study shows that the content of the {112} and {101} extension twins increases significantly as the deformation temperature decreases. The deformation mechanism gradually changes from the auxiliary role of twins to the dominance of twins."/>