Effect Of Alloy Composition On Microstructure And Mechanical Properties Of TA15 Titanium Alloy
Effect of alloy composition on microstructure and mechanical properties of TA15 titanium alloy
A slight change for the analysis of TA15 titanium alloy composition and the response of the relationship between microstructure and mechanical properties, the use of electronic universal tensile testing machine and split hopkinson pressure bar (SHPB) device was measured by four different components of TA15 titanium alloy at room temperature tensile properties of quasi static and dynamic mechanical properties, the results show that the Zr element influence on room temperature tensile strength is weak, as the main alloying element Al, V, and the increase of the content of Mo element primary alpha content decreases, and secondary alpha photo layer is thin, the strength of the alloy increase, plastic drop;In the range of critical strain rate, the slight change of alloy composition has a weak influence on the dynamic mechanical properties. Improving the content of main alloying elements Al, Zr, V and Mo is conducive to improving the critical strain rate of the alloy, and it has excellent dynamic mechanical properties under this critical strain rate.The smaller the primary phase volume fraction and the smaller the secondary photo layer, the better the room temperature tensile strength, critical strain rate and dynamic mechanical properties of TA15 titanium alloy.
The influence of alloy element distribution and structure on the mechanical properties of TA15 bar with flaky and isoaxial microstructure was studied by scanning electron microscopy BEI and EBSD.IQ diagram and composition analysis showed that as much as 20% of the alloy solute atoms in solid solution produced significant lattice distortion in phase, resulting in greater solid solution strengthening effect in phase than in phase. The contribution of solid solution strengthening to yield strength of TA15 bar was greater than that of fine crystal strengthening, which was the main reason for the similar yield strength of the two tissues.Equiaxed microstructure bars with fine grain and large lattice distortion are distributed uniformly on the phase boundary and 29% small Angle grain boundary, which makes the deformation not easy to be concentrated locally and plays the role of even deformation, improves the tensile strength and plastic deformation ability, and the comprehensive performance is better than the flaky microstructure.
