<span>TC21钛合金微观组织对准静态和动态压缩性能的影响<br /></span> <br />-中国材料进展

文章信息/Info

Title:: Effects of Microstructure on the Quasi-Static and Dynamic Compression Properties of TC21 Titanium Alloy

Author(s):: YANG Hongbin; LI Mengnie; BU Hengyong; Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, China

Keywords:: TC21 titanium alloy; microstructure; quasi-static and dynamic; compression properties

摘要:: TC21钛合金经不同工艺热处理后，获得了等轴组织、双态组织和片层组织，通过万能材料试验机及分离式Hopkinson压杆，分别对3种组织试样进行压缩试验，研究微观组织对TC21钛合金准静态和动态压缩性能的影响。结果表明，三者的准静态压缩性能各不相同，等轴组织塑性最好，但其强度低；双态组织强度较高，断裂应变却较差；片层组织具有较好的强塑性匹配。三者的动态压缩性能也存在差异，在1500~3200 s-1应变率压缩下，等轴组织的动态流变应力较低，但其动态塑性应变较好，具有较好的抗冲击性能；双态组织有着较高的流变应力，但其抗冲击性能较差；片层组织表现出较高的流变应力同时抗冲击性能好，为三者中动态力学性能匹配最佳。

Abstract:: Three different microstructures of TC21 titanium alloys, including equiaxed, binary and lamellar microstructure, were obtained after different heattreatments. The effects of microstructure on the quasistatic and dynamic compression properties were studied and analyzed by using compression tests. The results showed that, different microstructure presented different quasistatic and dynamic compression performances. The equiaxed microstructure had a higher plasticity, but lower strength. Binary microstructure had a better strength, but poor plasticity. Lamellar microstructure had a relatively better plasticity and strength. At the strain rate about 1500~3200 s-1, the equiaxed microstructure had a lower flow stress, but higher dynamic plastic strain and impact resistance. Binary microstructure had a higher flow stress, but poor impact resistance. Lamellar microstructure showed higher flow stress and impact resistance, which indicated the lamellar microstructure had a better comprehensive performance in the three kinds of microstructure.