论文部分内容阅读
采用自制的Hopkinson拉杆装置，在20—1000s－1应变速率范围内研究了具有近全片层组织的Ti－47Al—2Mn—2Nb合金的拉伸力学性能，并与准静态拉伸性能相比较试验发现动态强度明显高于静态强度，前者和应变速率之间遵循线性关系，后者和应变速率之间遵循半对数线性关系；室温塑性随应变速率变化而波动，但变化范围不大.扫描电镜断口分析结果表明，动态与静态断裂方式都以穿晶解理为主，局部区域伴有沿晶开裂.
Tensile mechanical properties of Ti-47Al-2Mn-2Nb alloy with nearly full lamellar structure were investigated in a range of 20-1000s-1 using a home-made Hopkinson tie rod system and compared with the quasi-static tensile properties The dynamic strength is obviously higher than the static strength, the linear relationship exists between the former and the strain rate, and the latter follows the semi-logarithmic linear relationship between the strain rates. The plasticity at room temperature fluctuates with the strain rate, but the change range is insignificant. Fracture analysis results show that the dynamic and static fracture modes are mainly transgranular cleavage, with the local area along the crystal cracking.