Study on Dynamic Mechanical Response of TC21 Alloy

Abstract:

Some results of an experimental study on high strain rate deformation of TC21 alloy are discussed in this paper. Cylindrical specimens of the TC21 alloys both in binary morphology and solution and aging morphology were subjected to high strain rate deformation by direct impact using a Split Hopkinson Pressure Bar. The deformation process is dominated by both thermal softening effect and strain hardening effect under high strain rate loading. Thus the flow stress doesn’t increase with strain rate at the strain hardening stage, while the increase is obvious under qusi-static compression. Under high strain rate, the dynamic flow stress is higher than that under quasi-static and dynamic flow stress increase with the increase of the strain rate, which indicates the strain rate hardening effect is great in TC21 alloy. The microstructure affects the dynamic mechanical properties of TC21 titanium alloy obviously. Under high strain rate, the solution and aging morphology has higher dynamic flow stress while the binary morphology has better plasticity and less prone to be instability under high strain rate condition. Shear bands were found both in the solution and aging morphology and the binary morphology.

• Periodical: Applied Mechanics and Materials (Volumes 88-89)
• Pages: 674-678
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.88-89.674
• Online since: August 2011
• Authors: Shuang Zan Zhao, Xing Wang Cheng, Fu Chi Wang
• Keywords: Adiabatic Shear Band (ASB), Flow Stress, Heat Treatment, SHPB, TC21 Alloy

References

[1] K.A. Hartley, J. Duffy, R.H. Hawley: Measurement of the temperature profile during shear band formation in steels deforming at high strain rates, Mech. Phys. Solids. Vol. 35 (1987), p.283–301.

DOI: 10.1016/0022-5096(87)90009-3

[2] Zhang Yingnan, etc: Effect of treatment on microstructure and tensile properties of TC21 alloy, Chinese Journal of Rare Metals, Vol. 28 (2004), p.34−38.

[3] Zhu Zhishou, etc: Study on the relationship between heat treatment parameters andmicrostructures evolvement of new type TC21 titanium alloy, Titanium Industry Progress, Vol. 23 (2006), p.24−27.

[4] Fei Y H, etc: The phase and microstructure of TC21 alloy, Mater Sci Eng A, Vol. 94 (2008), p.166−172.

[5] Chen Ju, Zhao Yongqing, Zeng Weidong: Effect of microstructure on impact toughness of TC21 alloy, Trans Nonferrous Met Soc China, Vol. 17 (2007), p.93−98.

[6] Feng Liang, etc: High temperature deformation behavior of TC21 alloy, Journal of Aeronautical Materials, Vol. 24 (2004), p.11−13.

[7] Qu Henglei, etc: Study on microstructure of TC21 alloy under different deformation conditions. Journal of Materials Engineering, Vol. S1(2006), p.274−277.

[8] Li Y L, Guo Y Z, Hu H T, Wei Q: A critical assessment of high-temperature dynamic mechanical testing of metals, International Journal of Impact Engineering, Vol. 36(2009): p.1−8.

DOI: 10.1016/j.ijimpeng.2008.05.004

[9] Hu Shisheng: Hopkinson bar technology, Ordnance Material Science and Enginnering, Vol. 11 (1991), pp.40-47.

[10] Gong Xuhui: Dynamic tensile behavior of titanium alloys at elevated temperatures, The Chinese Journal of Nonferrous metals, Vol. 20 (2010), pp.647-654.

[11] Blazynski T Z: Materials at high strain rates, London, New York: Elsevier Science, 1987: p.133.

[12] Q. Xue, M.A. Meyers, V.F. Nesterenko: Self organisation of shear bands in titanium and Ti-6Al-4V alloy, Acta Mater, Vol. 50 (2002), p.575–596.

DOI: 10.1016/s1359-6454(01)00356-1