挤压比和钛质量分数对U-Ti合金力学性能的影响

Effect of Extrusion Ratio and Titanium Contents on Properties of Uranium-Titanium Alloys

利用材料实验机和分离式霍普金森压杆对2种挤压比、3种钛质量分数的U-Ti合金室温静动态力学性能进行了研究。结果表明:挤压比为4∶1时,U-Ti合金的静动态强度均高于挤压比为8∶1的情况;挤压比相同时,钛质量分数越高,U-Ti合金的静态屈服强度越低。6种U-Ti合金中挤压比为4∶1,钛质量分数为0.95%的U-Ti合金综合力学性能最好,拟合得到了该合金的Johnson-Cook模型参数,并通过数值仿真进行了有效性验证。

The quasi-static and dynamic mechanical properties of uranium-titanium alloys with 2 extrusion ratios and 3 titanium contents are tested,respectively by universal material testing machine and split Hopkinson pressure bar(SHPB)at room temperature.The results show that the static yield strength and dynamic yield strength of the extruded 4 uranium-titanium alloy are higher than that of the extruded 8 alloy.When the extrusion ratio remains constant,the static yield strength of uranium-titanium alloys decreases with the increase of titanium content.The mechanical properties of the uranium-titanium alloy are the best when the extrusion ratio is 4 and the titanium content is 0.95%among the six uranium-titanium alloys,and its Johnson-Cook model parameters of the alloy are fitted and verified by numerical simulation.