Phase transformation and dynamic recrystallization behaviors in a Ti55511 titanium alloy during hot compression

• Published in: Journal of alloys and compounds 2019-07, Vol.795, p.471-482
• Main Authors: Lin, Y.C., Huang, Jian, He, Dao-Guang, Zhang, Xiao-Yong, Wu, Qiao, Wang, Li-Hua, Chen, Chao, Zhou, Ke-Chao
• Format: Article
• Language: English
• Subjects: Alloy; Deformation; Dynamic recrystallization; Dynamic transformation; Hot pressing; Phase; Phase transitions; Phases; Strain rate; Titanium alloys; Titanium base alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.04.319

Hot compression experiments of a Ti55511 titanium alloy are conducted to study the phase transformation characteristics and dynamic recrystallization (DRX) behavior. It is found that the fraction of α phase decreases with increasing the strain rate or deformation amount. Meanwhile, the original lamellar α phases easily transform into the spheroidal and bulk α phases at larger deformation amounts or higher strain rates. Most of α phases disappear and the final microstructures are mainly β phases when the temperature is over 800 °C. The DRX degree rises with raising the deformation amount or decreasing the strain rate. However, the DRX behavior becomes weaken with raising the deformation temperature. α phases are evenly distributed around β phases during hot compressive deformation, which not only restrains the growth of β phases but also promotes the DRX process of β phases. In addition, the geometric DRX takes place within α phases, while the continuous DRX occurs within β phases during the hot compression. [Display omitted] •Phase transformation and dynamic recrystallization (DRX) behavior of a Ti55511 titanium alloy are studied.•The volume fraction of α phase decreases with increasing the strain rate or deformation degree.•Initial lamellar α phases easily transforms into bulk/spheroidal α phases at the larger strains or higher strain rates.•The α phases not only restrains the growth of β phase, but also promotes the DRX process of β phase.•The geometric DRX takes place within α phases, while the continuous DRX occurs within β phases.