Microstructural characterization and evolution mechanism of adiabatic shear band in a near beta-Ti alloy

Yang, Yi; Jiang, Feihong; Zhou, B.M.; Li, X.M.; Zheng, H.G.; Zhang, Q.M.

doi:10.1016/j.msea.2010.12.053

Cited by 90 publications

(36 citation statements)

References 27 publications

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“…The variations observed in the microstructure across the secondary deformation zone for the Ti-25Nb-3Mo-3Zr-2Sn alloy are largely consistent with those reported for adiabatic shear bands formed in titanium alloys [21,30,31] involving a progression to finer, more equiaxed grains in the region of most intense deformation, in this case at the cutting interface [14].…”

Section: Discussionsupporting

confidence: 85%

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Kent¹,

Rashid²,

Bermingham³

et al. 2018

Preprint

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bstract: New metastable β titanium alloys are receiving increasing attention due to their excellent biomechanical properties and machinability is critical to their uptake. In this study machining chip microstructure have been investigated to gain an understanding of strain and temperature fields during cutting. For higher cutting speeds, ≥60 m/min, the chips have segmented morphologies characterised by a serrated appearance. High levels of strain in the primary shear zone promote formation of expanded shear band regions between segments which exhibit intensive refinement of the β phase down to grain sizes below 100 nm. The presence of both α and β phases across the expanded shear band suggests that temperatures during cutting are in the range of 400-600°C. For the secondary shear zone, very large strains at the cutting interface result in heavily refined and approximately equiaxed nanocrystalline β grains with sizes around 20-50 nm, while further from the interface the β grains become highly elongated in the shear direction. An absence of the α phase in the region immediately adjacent to the cutting interface indicates recrystallization during cutting and temperatures in excess of the 720°C β transus temperature.

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Section: Discussionsupporting

confidence: 85%

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Kent¹,

Rashid²,

Bermingham³

et al. 2018

Preprint

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“…It is concluded that shear bands will form two coaxial and symmetrical hemispherical-shaped shells inside the cylindrical specimens during the high strain rate testing in the study of Odeshi et al on a dual-phase steel [36]. In general, the flow stress will drop from the maximum value with the formation of adiabatic shear bands [37][38][39][40]. However, no such flow softening is observed in the stress-strain curves of specimens in which shear bands are observed.…”

Section: Microstructural Observationmentioning

confidence: 94%

“…Flow softening is attributed to the initiation of adiabatic shear bands [37][38][39][40], break-up of high aspect ratio lathlike precipitates [47] or adiabatic heating. As the former two microstructural features are absent in the specimens deformed at 293K, it is supposed that thermal softening effects caused by adiabatic heating are responsible for the flow softening behaviour of the Ti6554 alloy deformed at high strain rates at a temperature of 293K.…”

Section: Strain Hardening Behaviourmentioning

confidence: 99%

The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Zhan

Kent

Wang

et al. 2014

Materials Science and Engineering: A

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The stress-strain behaviour and microstructural evolution of the Ti-6Cr-5Mo-5V-4Al (Ti6554) alloy was systematically investigated using Split Hopkinson Pressure Bar (SHPB) tests over a wide range of strain rates from 1000 s -1 to 10000 s -1 and initial temperatures from 293K to 1173K. Dislocation slip is the main deformation mechanism for plastic flow of the Ti6554 alloy at high strain rates. The flow stress increases with increasing strain rate and decreasing temperature. Also the flow stress is more sensitive to temperature than to strain rate. For high strain rate deformations, the strain hardening rate is found to be negative at 293K and increases with increasing temperatures. Flow softening observed at 293K is potentially caused by adiabatic heating. The increment in the strain hardening rate with increasing temperatures may be the result of interactions between thermally activated solute Cr atoms and mobile dislocations. When the temperature is raised to 873K, a novel Į precipitate 2 morphology consisting of globular Į aligned in strings was observed in specimens deformed at strain rates of 4000 and 10000 s -1 . It has hardening effects on the ȕ matrix and is purported to nucleate on dislocations introduced by the high strain rate deformation. Adiabatic shear bands were observed in specimens deformed at higher temperatures (873K). The microstructure inside the shear bands is harder than that outside of the shear bands in the Ti6554 alloy.

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“…It is widely accepted that the plastic flow behaviors and the corresponding deformation mechanisms are highly dependent on the loading rate for metals and alloys [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40]. It is also well known that the observed resistance to plastic deformation is a rate-controlling process and can be affected by the strain rate [23][24][25]27,28].…”

Section: Introductionmentioning

confidence: 99%

Strain Rate Effect on Tensile Behavior for a High Specific Strength Steel: From Quasi-Static to Intermediate Strain Rates

Wang

Yang

et al. 2017

Metals

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Abstract:The strain rate effect on the tensile behaviors of a high specific strength steel (HSSS) with dual-phase microstructure has been investigated. The yield strength, the ultimate strength and the tensile toughness were all observed to increase with increasing strain rates at the range of 0.0006 to 56/s, rendering this HSSS as an excellent candidate for an energy absorber in the automobile industry, since vehicle crushing often happens at intermediate strain rates. Back stress hardening has been found to play an important role for this HSSS due to load transfer and strain partitioning between two phases, and a higher strain rate could cause even higher strain partitioning in the softer austenite grains, delaying the deformation instability. Deformation twins are observed in the austenite grains at all strain rates to facilitate the uniform tensile deformation. The B2 phase (FeAl intermetallic compound) is less deformable at higher strain rates, resulting in easier brittle fracture in B2 particles, smaller dimple size and a higher density of phase interfaces in final fracture surfaces. Thus, more energy need be consumed during the final fracture for the experiments conducted at higher strain rates, resulting in better tensile toughness.

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Microstructural characterization and evolution mechanism of adiabatic shear band in a near beta-Ti alloy

Cited by 90 publications

References 27 publications

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Strain Rate Effect on Tensile Behavior for a High Specific Strength Steel: From Quasi-Static to Intermediate Strain Rates

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Microstructural characterization and evolution mechanism of adiabatic shear band in a near beta-Ti alloy

Cited by 90 publications

References 27 publications

Insights Into Machining of a &beta; Titanium Biomedical Alloy from Chip Microstructures

Insights Into Machining of a &beta; Titanium Biomedical Alloy from Chip Microstructures

The dynamic response of a β titanium alloy to high strain rates and elevated temperatures

Strain Rate Effect on Tensile Behavior for a High Specific Strength Steel: From Quasi-Static to Intermediate Strain Rates

Contact Info

Product

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Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures

Insights Into Machining of a β Titanium Biomedical Alloy from Chip Microstructures