Tensile deformation behaviors of Ti-6.5Al-3.5Mo-1.5Zr-0.25Si alloy with different percentages of primary a phase

The mechanical properties and tensile deformation mechanism of Ti-6.5Al-3.5Mo-1.5Zr-0.25Si alloy (TC11) with different percentages of primary alpha phase (alpha(p)) were studied by conventional and interrupted tensile tests, respectively. The results show that the strength of TC11 alloy increases with the increase of the percentage of alpha(p). During tensile deformation, TC11 alloy with different percentages of alpha(p) exhibits similar behavior. The deformation mechanism in alpha(p) transforms from single slip to multiple slip. While, the microcracks first initiate at the interface of two phases, propagate along it, and then propagate through the transformed beta phase (beta(t)) and finally through alpha(p). Finally, a method for predicting the strength of TC11 alloy considering the sizes of alpha(p) and beta(t) is proposed.

Automated summary

The mechanical properties and tensile deformation mechanism of a Ti-6.5Al-3.5Mo-1.5Zr-0.25Si alloy with varying percentages of primary alpha phase (alpha(p)) were investigated. It was found that the strength of the alloy increased with increasing percentage of alpha(p). The deformation mechanism in alpha(p) transitioned from single slip to multiple slip during tensile deformation. Microcracks were observed to initiate at the interface of two phases, propagate through the transformed beta phase (beta(t)), and eventually through alpha(p). A method for predicting the alloy's strength by considering the sizes of alpha(p) and beta(t) was proposed.