Fine-grained nickel deformed by direct impact at different velocities: Microstructure and mechanical properties

Dirras, G.; Couque, H.; Gubicza, Jenő; Ouarem, A.; Chauveau, Thierry; Jenei, Péter

doi:10.1016/j.msea.2010.03.045

Cited by 17 publications

(5 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Actually, similar microstructures were reported to form during cold rolling and ECAP of aluminum and its alloys, [25][26][27] or during high-strain-rate load impacts in Ni. [28] In addition, a similar microstructure with sharp boundaries and dislocation-free interiors as has been reported previously during the static annealing of Al + 0.13 (1) and (2) of the DPD-processed samples used for X-ray analyses and compression tests. wt pct Mg alloy at 423 K (150°C).…”

Section: Analysis Of the Microstructure By Temsupporting

confidence: 77%

Ultrafine-Grained Aluminum Processed by a Combination of Hot Isostatic Pressing and Dynamic Plastic Deformation: Microstructure and Mechanical Properties

Dirras

Chauveau

Abdul–Latif³

et al. 2011

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

Commercial-purity (99 wt pct), bulk, ultrafine-grained aluminum samples were produced by a two-step process that combines powder consolidation by hot isostatic pressing and dynamic plastic deformation. The compaction step yielded crystallographic texture-free specimens with an average grain size of approximately 2 lm. Then, some of the consolidated specimens were deformed dynamically at room temperature at an initial strain rate of 370 seconds À1 and up to an axial strain of e = 1.25. After dynamic plastic deformation, the grain size and the dislocation density were approximately 500 nm and 10 14 m À2 , respectively. The yield strength was approximately 77 MPa for the as-consolidated sample, which increased up to approximately 103 MPa and 120 MPa for the impacted samples along the axial and radial directions, respectively. The compression stress as a function of strain showed saturation behavior for the axially deformed samples, whereas the specimens deformed along the radial direction exhibited significant strain softening. The latter behavior is explained mainly by the weakening of the crystallographic texture that occurred because of the strain-path change along the radial direction.

show abstract

Section: Analysis Of the Microstructure By Temsupporting

confidence: 77%

Ultrafine-Grained Aluminum Processed by a Combination of Hot Isostatic Pressing and Dynamic Plastic Deformation: Microstructure and Mechanical Properties

Dirras

Chauveau

Abdul–Latif³

et al. 2011

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recent post-mortem analyses of pure nickel compression specimens tested in the viscous regime reveal the occurrence of recovery/ recrystallization [3]. In this work the recrystallized nickel was found to have a similar dislocation density and strength that the initial state of the nickel.…”

Section: Introductionmentioning

confidence: 56%

On the importance of recrystallization to reproduce the Taylor impact specimen shape of a pure nickel

Couque

2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Taylor tests are a mean to investigate the dynamic plastic and failure behaviour of metals under compression. By taking in account the strengthening occurring at high strain rates, the Taylor final diameter of a pure nickel impacted at 453 m/s have been numerically reproduced by 13%. Through post-mortem observations of the specimen impacted at 453 m/s, a recrystallization process has been found to occur resulting in a softening of the pure nickel. Subsequent numerical simulations taking in account this softening have been found to reduce the difference between experimental and numerical diameter by 10%.

show abstract

“…2 The dislocation-free grains presented in Fig. 3 indicate the occurrence of dynamic recrystallization (DRX) during dynamic compression testing and this was also reported during high strain rate deformation [36,37]. While SRX occurred at 473-573 K, the DRX initiated at a much lower temperature of 298 K. In practice, the recrystallization process may be assisted by the fast heat generation in the severe plastic deformation during impact testing.…”

Section: The Recrystallization Mechanismmentioning

confidence: 76%

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

Zhang

Wang

Zhilyaev

et al. 2015

Materials Science and Engineering: A

View full text Add to dashboard Cite

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.

show abstract

Fine-grained nickel deformed by direct impact at different velocities: Microstructure and mechanical properties

Cited by 17 publications

References 40 publications

Ultrafine-Grained Aluminum Processed by a Combination of Hot Isostatic Pressing and Dynamic Plastic Deformation: Microstructure and Mechanical Properties

Ultrafine-Grained Aluminum Processed by a Combination of Hot Isostatic Pressing and Dynamic Plastic Deformation: Microstructure and Mechanical Properties

On the importance of recrystallization to reproduce the Taylor impact specimen shape of a pure nickel

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

Contact Info

Product

Resources

About