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

Zhang, Shixiong; Wang, Ying Chun; Zhilyaev, Alexander P.; Korznikova, Elena A.; Li, Shukui; Рааб, Г. И.; Langdon, Terence G.

doi:10.1016/j.msea.2015.06.035

Cited by 13 publications

(8 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the high strength shear stress induces the phase transformation of α-phase and β-phase of alloy [ 11 , 14 ], high strain rate deformation leads to the formation of high density dislocation structure [ 15 , 16 , 17 ], severe shear strain results in the generations of deformation twinning [ 18 , 19 , 20 , 21 ] and the formation of DXR grains [ 11 , 12 , 22 ]. In the SDL, heavily deformed coarse grains with large size changed into the nanoscale grains or ultrafine grains which provide more slip systems in co-operation for the ASB formation [ 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Another one is the equal channel angular pressing (ECAP) test as a processing mean for grain refinement under quasi-static loading condicions [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 ]. By TEM analysis, Chen et al [ 15 ] showed that, after the ECAE processing, a large number of twining grains formed in the SDL region and the twining deformation plane is the crystal plane {10¯11}.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

Jin

Shuang

et al. 2020

Materials

View full text Add to dashboard Cite

Titanium Ti6Al4V alloy is a superior material that has extremely high strength, hardness and good anti-corrosion resistance. Dynamic shear-compression experiments were carried out on the alloy to investigate the micro-mechanisms of adiabatic shear banding (ASB) formation. The split Hopkinson pressure bar (SHPB) setup were used for the tests at high strain rates. It was found that the shear deformation localization (SDL) was considerably affected by the complex loading conditions. The micro-mechanisms for the ASB formation relied on different shear compressive proportion of loadings (SCLPs). Scanning electron microscope (SEM) observations showed that the ASB width was related with the SCLP and the fracture failure of alloy was induced by the nucleation and growth of microvoids. In transmission electron microscope (TEM) analysis, the microstructural changes of material within the ASB were characterized by dynamic recrystallization (DRX) and twining grain formation, dislocation migration, and stacking and grain refining processes. The results in this article demonstrates a complex image of microstructural evolution of alloy in the shear localization process.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

Jin

Shuang

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…Although several investigations were reported evaluating the mechanical behaviour at dynamic strain rates in several UFG metals [48][49][50][51][52][53][54][55][56][57][58], there are no reports are at present available on the deformation of SPD-processed AlMg-Sc alloys at high strain rates. Accordingly, this investigation was initiated to assess the mechanical properties and deformation mechanisms in Al-Mg-Sc alloys tested under quasistatic and dynamic conditions.…”

Section: Introductionmentioning

confidence: 99%

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Pereira

Wang

Huang

et al. 2017

Materials Science and Engineering: A

Self Cite

View full text Add to dashboard Cite

This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractExperiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 m and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10 -4 to ~10 3 s -1 .The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarsegrained material to superplasticity in the UFG alloy.

show abstract

“…Because the Ti is not easily oxidized during low-temperature annealing, the samples were annealed in the furnace without protective gas. It was established earlier that, for NG Ti, the mechanical properties dropped significantly when the annealing temperature was 200 C. [45] Dog-bone-shaped tensile samples with gauge lengths of 18 mm, widths of 3 mm, and thicknesses of 0.4 mm were machined from the rolled sheets and tensile tests were then conducted at RT using a strain rate of 1.0 Â 10 À3 s À1 on an Instron testing machine. To provide overall consistency in the experimental results, each test was repeated three times.…”

Section: Methodsmentioning

confidence: 99%

“…It was established earlier that, for NG Ti, the mechanical properties dropped significantly when the annealing temperature was 200 °C. [ 45 ]…”

Section: Methodsmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Wang

Yan

et al. 2020

Adv Eng Mater

Self Cite

View full text Add to dashboard Cite

showed that the strength and microhardness of UFG Ti follow the conventional Hall-Petch relationship. [10] Several severe plastic deformation (SPD) techniques have been used to fabricate UFG samples, including Ti, such as highpressure torsion (HPT), [11-13] multidirectional forging, [14] friction stir welding, [15] equal-channel angular pressing (ECAP), [5,16,17] and special rolling technology. [18,19] It was reported that the strength of UFG Ti processed by HPT reached %1200 MPa [11] and there was a strength of %930 MPa in UFG Ti fabricated by multiforging and subsequent rolling. [14] There is a report that the mechanical properties and corrosion resistance of CP Ti after continuous ECAP plus short-duration annealing was comparable with the as-received sheets [20] and UFG Ti prepared by ECAP þ rolling had a higher strength than Ti-6Al-4V alloys. [21] Recently, a shear drawing technique was developed to fabricate UFG Ti bars and the results showed that the strength was improved to %590 MPa compared with %470 MPa in conventional drawing. [22] Deformation at cryogenic temperature may further refine the grain size compared with deformation at room temperature (RT). Aluminum alloys [23-25] and copper alloys [26-28] showed high

show abstract

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

Cited by 13 publications

References 57 publications

Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions

Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate

Microstructural Evolution and Mechanical Properties of Ultrafine‐Grained Ti Fabricated by Cryorolling and Subsequent Annealing

Contact Info

Product

Resources

About