Hot Deformation Behavior and Processing Map Analysis of Ti-6Al-3Nb-2Zr-1Mo Near-&#x003b1;Titanium Alloy

WANG Feilong; ZHANG Guozheng; GUO Kai; LIANG Shunxing; MA Mingzhen

doi:10.3969/j.issn.1674-6457.2026.10.010

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Journal of Netshape Forming Engineering ›› 2026, Vol. 18 ›› Issue (10) : 103-111. DOI: 10.3969/j.issn.1674-6457.2026.10.010

Light Alloy Forming

Hot Deformation Behavior and Processing Map Analysis of Ti-6Al-3Nb-2Zr-1Mo Near-αTitanium Alloy

WANG Feilong^1,2, ZHANG Guozheng³, GUO Kai³, LIANG Shunxing², MA Mingzhen²

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Abstract

The work aims to study the thermal plastic deformation behavior and the microstructure evolution mechanism during the deformation process of the new titanium alloy, and to provide a theoretical basis for the optimization of titanium alloy thermal processing. The thermal deformation behavior and the microstructure evolution behavior of the Ti-6Al-3Nb-2Zr-1Mo alloy were studied through thermal compression experiments, thermal processing maps under different strain conditions were drawn, the power dissipation characteristics and the distribution of the instability zone of the alloy were analyzed, and its optimal thermal processing window was determined. The microstructure evolution laws of the Ti-6Al-3Nb-2Zr-1Mo titanium alloy during the single-phase and two-phase thermal deformation processes were studied. The isothermal thermal compression experiments were carried out on a thermal simulation testing machine, with the experimental temperature range of 750-1 100 ℃, a strain rate of 0.001-10 s^‒1, and a deformation amount of 60%. Through linear regression, the constitutive equation of the Ti-6Al-3Nb-2Zr-1Mo alloy was constructed. The results showed that the activation energy of the Ti-6Al-3Nb-2Zr-1Mo alloy was 620.93 kJ/mol at 750-950 ℃, and 198.76 kJ/mol at 1 000-1 100 ℃. The thermal processing map of the Ti-6Al-3Nb-2Zr- 1Mo alloy was drawn based on the dynamic material model and Murty criterion. In conclusion, as the deformation temperature increases, the volume fraction of the equiaxed α phase decreases, and the microstructure gradually coarsens. The optimal hot working window for the Ti-6Al-3Nb-2Zr-1Mo alloy is defined within the temperature range of 930-1 080 ℃ and strain rates below 0.1 s^‒1. Under these processing conditions, a mixed microstructure comprising equiaxed α grains and lamellar (α+β) colonies is obtained, effectively suppressing the formation of defects such as adiabatic shear bands and cracks.

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Ti-6Al-3Nb-2Zr-1Mo titanium alloy / hot deformation behavior / thermal processing map / microstructural evolution

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WANG Feilong, ZHANG Guozheng, GUO Kai, LIANG Shunxing, MA Mingzhen. Hot Deformation Behavior and Processing Map Analysis of Ti-6Al-3Nb-2Zr-1Mo Near-αTitanium Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(10): 103-111 https://doi.org/10.3969/j.issn.1674-6457.2026.10.010

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