脉冲电磁作用下Ti-9Al-5.4Mo-1.9Zr-0.3Si钛合金的微观组织及力学性能研究

Study on Microstructure and Mechanical Properties of Ti-9Al-5.4Mo-1.9Zr-0.3Si Titanium Alloy in Pulse Electromagnetic Field

采用金相显微镜、X射线衍射仪、透射电镜、显微硬度计等研究了脉冲电磁作用下Ti-9Al-5.4Mo-1.9Zr-0.3Si钛合金的微观组织及力学性能。结果表明:外场处理前后钛合金基体中均存在大量等轴α组织和由α组织发生结构转变得到的β组织。钛合金原始组织中初生α相含量为41.2%,经脉冲电场、磁场和电磁场处理后,初生α相含量分别变成42.1%、44.3%和43.6%。通过外场处理后钛合金的α-Ti轴较原始组织明显增大,其中脉冲电磁场处理得到的α-Ti轴比最大。磁场作用下合金基体的缠结位错减少不明显;通过电场或脉冲电磁处理后,合金基体组织的位错密度总体下降,缠结位错数量也显著降低。采用各个方法处理所得试样硬度差别不大,脉冲电磁处理试样硬度较低。

The microstructure and mechanical properties of Ti-9 Al-5.4 Mo-1.9 Zr-0.3 Si titanium alloy were studied by metallographic microscope,X-ray diffractometer,transmission electron microscope and microhardness tester.The results show that there are a lot of equiaxialαstructure andβstructure resulting fromαstructural transformation in titanium alloy matrix before and after field treatment.The content of primaryαphase in the original microstructure of the titanium alloy is 41.2%.After the treatment with pulsed electric field,magnetic field and electromagnetic field,the content of primaryαphase changes to 42.1%,44.3%and 43.6%,respectively.Compared with the original microstructure,α-Ti axis ratio of the titanium alloy is significantly larger after external field treatment,and theα-Ti axis ratio obtained by pulse electromagnetic field treatment is the largest.The entanglement dislocation in the alloy matrix is not significantly reduced after magnetic field treatment.After electric field or pulse electromagnetic field treatment,the dislocation density in the alloy matrix is generally reduced,and the number of entanglement dislocations is also significantly reduced.The hardness of the samples obtained by various methods is basically consistent,and the hardness of the sample after pulse electromagnetic field treatment is relatively low.