Strain Rate Sensitivity of Tensile Properties in Ti-6.6Al-3.3Mo-1.8Zr-0.29Si Alloy: Experiments and Constitutive Modeling

Abstract

The complex deformation usually involves wide strain-rate change. However, few efforts have been devoted to investigate the effect of strain rate history on the tensile behavior of α + β titanium alloy. In present paper, tensile tests of Ti-6.6Al-3.3Mo-1.8Zr-0.29Si alloy were carried out under both constant and variable strain-rate conditions within the region from 10−3~500 s−1. A single stress pulse experimental technique was utilized to conduct the recovery tests. The strain-rate history effect was examined. It is found that the flow stress is independent on the strain rate history, though the alloy exhibits obvious positive strain rate sensitivity. The Taylor-Quinney coefficient of the plastic work converted to heat is proved as 0.9 at high strain rates. The cavitation fracture mechanism is revealed by microstructural observation over the full range explored. In basis of the experimental results and other pulished literatures, empirical Khan-Huang-Liang constitutive model was suitably modified to account for the strain-rate dependent behavior. Good agreement is achieved between the modeling prediction results and experimental data.

Evolution of Secondary α Phase during Aging Treatment in Novel near β Ti-6Mo-5V-3Al-2Fe Alloy

“…Near β titanium alloys are considered as excellent alternatives to replace steels for structural applications in the aerospace industry due to their high specific strength, good corrosion resistance, and fatigue crack growth resistance [1,2,3,4,5]. For instance, the Ti-5Al-5Mo-5V-3Cr (Ti-5553) alloy and the Ti-10V-2Fe-3Al (Ti-1023) alloy have been applied on landing gear forgings for Airbus-350 and Boeing 777, respectively [6,7].…”

Fracture Mechanisms of Micro-Alloy Steel at Elevated Temperature

“…In order to control the use of metals and alloys, it is necessary to study their thermomechanical behavior before subjecting them to deformation treatments on an industrial scale. Zhang et al [9] studied the effect of heat treatment conditions on the flow behavior, recrystallization mechanism, microstructural changes during hot deformation, and their effects on the final properties. It is characterized by various laboratory tests according to different parameters such as deformation temperature, deformation speed, and microstructural properties of the material.…”

Deformation Behavior and Microstructural Evolution during Hot Stamping of TA15 Sheets: Experimentation and Modelling

“…Titanium alloys, as advanced lightweight materials, have been extensively used in the aerospace industry, due to their high strength, low density, and good corrosion resistance [1]. The poor ductility at room temperature and loss of dimensional accuracy caused by springback drives engineers to manufacture titanium alloys, especially panel components, using hot forming techniques, such as superplastic forming (SPF) [2], hot gas forming [3], incremental forming [4] and isothermal hot forming [5].…”