Deformation Twins and Mechanical Properties of Zirconium Doped TA4
The deformation behavior and microstructure evolution of two α-Ti alloys,Ti-0.34 wt.％ O (TA4) and Ti-15.9 wt.％ Zr-0.33 wt.％ O(TA4-Zr),were analyzed by means of tensile and compressive experiments at room temperature,XRD,metallographic analysis and EBSD.The results show that the two alloys have the similar basal texture after rolling and recrystallization.At the same grain size,the tensile yield strength of Zr-doped TA4-Zr was increased by about 200 MPa when compared with that of TA4.During the compression process,a large number of {10(1)2}<(1)011>tensile twins and a small number of {11(1)1}<11(26)>tensile twins were produced in TA4-Zr,while no twins were observed in TA4 at the same deformation.The addition of Zr significantly promoted the formation of tensile twins in α titanium alloys,leading to a more significant tension-compression yield asymmetry in TA4-Zr.
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