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Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti

Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti
Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti
The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s?1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.
dynamic compression, microstructure, mechanical behavior, constitutive equation, titanium
0921-5093
29-36
Zhang, Shixiong
48cab2f9-3e6f-4065-9b8b-bdfeb9b10468
Chun Wang, Ying
f208f43d-a445-4a08-8970-1c57c77270b2
Zhilyaev, Alexander P.
13424aa4-7ee2-4f00-a3a7-91ad6dbd1ec8
Korznikova, Elena
6a623244-e24f-4b73-8ae6-e569be301dd1
Li, Shukui
cf36cc37-f03a-4b4c-8f34-590354846838
Raab, Georgy I.
7561dd79-c69c-42bd-828a-bfc1a42a776f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86
Zhang, Shixiong
48cab2f9-3e6f-4065-9b8b-bdfeb9b10468
Chun Wang, Ying
f208f43d-a445-4a08-8970-1c57c77270b2
Zhilyaev, Alexander P.
13424aa4-7ee2-4f00-a3a7-91ad6dbd1ec8
Korznikova, Elena
6a623244-e24f-4b73-8ae6-e569be301dd1
Li, Shukui
cf36cc37-f03a-4b4c-8f34-590354846838
Raab, Georgy I.
7561dd79-c69c-42bd-828a-bfc1a42a776f
Langdon, Terence G.
86e69b4f-e16d-4830-bf8a-5a9c11f0de86

Zhang, Shixiong, Chun Wang, Ying, Zhilyaev, Alexander P., Korznikova, Elena, Li, Shukui, Raab, Georgy I. and Langdon, Terence G. (2015) Temperature and strain rate dependence of microstructural evolution and dynamic mechanical behavior in nanocrystalline Ti. Materials Science and Engineering: A, 641, 29-36. (doi:10.1016/j.msea.2015.06.035).

Record type: Article

Abstract

The mechanical behavior of commercial purity titanium with a nanocrystalline (NC) grain size was investigated using split Hopkinson pressure bar tests at high strain rates and over a range of temperatures. The study was accompanied by detailed microstructural investigations before and after compression testing. The results show that rotary dynamic recrystallization operates during compressive deformation at strain rates of ~3000 and ~4500 s?1 at temperatures from 298 to 573 K but cells form at 673 K. The dynamic mechanical behavior of NC Ti shows a strong dependence on temperature and strain rate such that the flow stress and the strain hardening rate both increase with increasing strain and decreasing temperature. A constitutive equation is derived to relate the flow stress to the temperature, strain rate and true strain and to predict the yield strength and the peak stress of NC Ti subjected to dynamic deformation at elevated temperatures.

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More information

Accepted/In Press date: 10 June 2015
e-pub ahead of print date: 12 June 2015
Published date: 12 August 2015
Keywords: dynamic compression, microstructure, mechanical behavior, constitutive equation, titanium
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 378065
URI: http://eprints.soton.ac.uk/id/eprint/378065
ISSN: 0921-5093
PURE UUID: ee174d60-8a03-4502-87b7-228463112ef5
ORCID for Terence G. Langdon: ORCID iD orcid.org/0000-0003-3541-9250

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Date deposited: 24 Jun 2015 13:55
Last modified: 19 Nov 2019 01:49

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Contributors

Author: Shixiong Zhang
Author: Ying Chun Wang
Author: Alexander P. Zhilyaev
Author: Elena Korznikova
Author: Shukui Li
Author: Georgy I. Raab

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