Effects of Microstructure and Strain Rate on Dynamic Mechanical Properties and Adiabatic Shear Band of TC4 Alloy
CHEN Wei1, ZHANG Huan1, MU Juan1(), ZHU Zhengwang2, ZHANG Haifeng2, WANG Yandong1
1.Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Sciences and Engineering, Northeastern University, Shenyang 110819, China 2.Shi -changxu Advanced Materials Innovation Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Cite this article:
CHEN Wei, ZHANG Huan, MU Juan, ZHU Zhengwang, ZHANG Haifeng, WANG Yandong. Effects of Microstructure and Strain Rate on Dynamic Mechanical Properties and Adiabatic Shear Band of TC4 Alloy. Acta Metall Sin, 2022, 58(10): 1271-1280.
Under dynamic load, shear bands constitute the main deformation mode comparaed with quasistatic deformation. This study systematically investigates the influence of microstructures and strain rates of Ti-6Al-4V (TC4) alloys on their adiabatic shear behavior. TC4 alloys with three types of microstructures (lamellar, bimodal, and equiaxial) were successfully obtained via different thermal treatments. The dynamic mechanical properties, such as the critical shear strain rates of the hardening, softening transformation, maximum shear strength, critical shear strain rates of adiabatic shear-band nucleation and bearing time of the three types of microstructures were compared. Results indicate that compared with the lamellar bimodal and equiaxial TC4 alloys, the lamellar TC4 alloy shows the best dynamic mechanical properties, achieving higher shear strength and critical shear strain rates as well as the lowest adiabatic shear sensitivity. Microstructural analysis reveals that the adiabatic shear bands that formed in the three types of alloys are brittle. The width of the shear band decreases with increasing shear strain rate. Furthermore, at the same shear strain rate, the order of the widths of the shear bands is as follows: lamellar TC4 alloy > bimodal TC4 alloy > equiaxial TC4 alloy.
Fund: National Natural Science Foundation of China(51771049);National Natural Science Foundation of China(51790484);National Key Laboratory Fund of China(JCKYS2020602005)
About author: MU Juan, associate professor, Tel: (024)83691568, E-mail: muj@atm.neu.edu.cn
Fig.1 Schematic of size of the hat-shaped sample (unit: mm)
Fig.2 XRD spectra of TC4 alloy as-received and after different heat treatments
Fig.3 SEM images of TC4 alloy with different microstructures (Insets show the magnified images) (a) as-received (b) equiaxed microstructure (c) lamellar microstructure (d) bimodal microstructure
Fig.4 Dynamic shear stress-strain curves of TC4 alloy with different microstructures at different shear strain rates (a) equiaxed microstructure (b) lamellar microstructure (c) bimodal microstructure (d) the shear strain rate of equiaxed microstructure is 7467 s-1
Fig.5 Variation curves of shear strength with shear strain rate of TC4 alloy with different microstructures
Fig.6 Shear stress-time curves of TC4 alloy with different microstructures at shear strain rates of 5000 s-1 (a), 6000 s-1 (b), 7000 s-1 (c), and 8000 s-1 (d)
Specimen
5000 s-1
6000 s-1
7000 s-1
8000 s-1
Equiaxed
83
79
78
74
Lamellar
98
87
84
82
Duplex
86
84
80
77
Table 1 Bearing time of TC4 alloy with different microstructures at different shear strain rates
Fig.7 Variation curves of adiabatic shear band width (t) of TC4 alloy with different microstructures
Fig.8 Adiabatic shear band morphologies of TC4 alloy with equiaxed (a), lamellar (b), and bimodal (c) microstructures
Fig.9 Crack morphologies of TC4 alloy with equiaxed (a), lamellar (b), and bimodal (c) microstructures
Fig.10 Schematics of fracture process of TC4 alloy (a) adiabatic shear band formation (b) microcrack formation (c) macrocrack formation (d) macrocrack steering (e) the crack continues to grow (f) two cracks converge
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