The mechanical properties of tungsten-based composites at very high strain rates

Yadav, Sandeep; Ramesh, K.T.

doi:10.1016/0921-5093(95)09865-8

Cited by 77 publications

(39 citation statements)

References 16 publications

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“…Major microstructural parameters affecting mechanical properties of this structure include prior ␤ grain size, colony size, thickness of grain boundary ␣ phase, volume fraction of ␣ and ␤, and ␣ lamellar spacing, which can be controlled by heat treatments or thermomechanical treatments in order to obtain desired mechanical properties. [7][8][9][10][11] However, previous studies on the Ti-6Al-4V alloy have mostly been focused on phenomena occurring under static or quasi-static loading, and deformation and fracture behaviors under dynamic loading were rarely studied from both macroscopic mechanical aspect and microscopic microstructural aspect in correlated manners. Thus, it is crucially required to acquire information on dynamic deformation and fracture behaviors of the Ti-6Al-4V alloy so that it can be effectively applied to strategic fields such as defense, aerospace, precision machinery, and automotive industries.…”

Section: Introductionmentioning

confidence: 99%

Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

Lee

et al. 2003

Metall Mater Trans A

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The effects of microstructural factors on the quasi-static tensile and dynamic torsional deformation behaviors in Ti-6Al-4V alloys with Widmanstätten structures were investigated in this study. Dynamic torsional tests were conducted using a torsional Kolsky bar for five Widmanstätten structures, in which microstructural parameters such as colony size and ␣ lamellar spacing were varied by heat treatments, and then the test data were analyzed in relation to microstructures, tensile properties, and fracture mode. Under dynamic torsional loading, maximum shear stress was largely dependent on colony size, whereas shear strain at the maximum shear stress point was on colony size as well as ␣ lamellar spacing. Adiabatic shear bands were found in the deformed area of the fractured torsional specimens, and their width was smallest in the structure whose colony size and ␣ lamellar spacing were both large. The possibility of the adiabatic shear band formation was quantitatively analyzed in relation to microstructural factors. It was the highest in the coarse Widmanstätten structure, which was confirmed by the theoretical critical shear strain (v Њ c ) condition for the adiabatic shear band formation.

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Section: Introductionmentioning

confidence: 99%

Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

Lee

et al. 2003

Metall Mater Trans A

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“…The material is strain-rate and temperature sensitive [13,14], as expected for a BCC material [8,9,15], and there is a mutual influence between theses effects (i.e., the thermal softening is not the same at different strain-rates or vice versa [9,13]). Up to medium-high strain-rates, the relation between stress and strain-rate seems to be logarithmic [13,14]: this highlights a deformation process based on thermal activation without a steep increase at very high strain-rates (change in the microstructural deformation mechanism).…”

Section: Bibliografic Reviewmentioning

confidence: 88%

“…For WHA alloys, several works dealt with the mechanical characterization in compression [7][8][9][10][13][14][15][16], tension [4,5,[17][18][19][20][21][22] or fatigue [4,5] at different temperatures [17,18,22], strain-rates [7,9,15,18,20] or both of them [8,10,13,14,16,19].…”

Section: Bibliografic Reviewmentioning

confidence: 99%

“…Tungsten alloys are finally appropriate in severe tooling applications, such as die casting, extrusion or in general, high temperature conditions. In military applications the WHAs are specialized as a kinetic energy penetrator since, for example, they represent a valid alternative to conventional depleted uranium penetrators, which are extremely environmentally unsafe materials [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Mechanical characterization and modeling of the heavy tungsten alloy IT180

Scapin

2015

International Journal of Refractory Metals and Hard Materials

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Pure tungsten or its alloys (WHA) find applications in several fields, especially due to the fact that these materials show a good combination of mechanical and thermal properties and they are commonly used in aerospace, automotive, metal working processes, military and nuclear technologies. Looking at the scientific literature, a lack in the mechanical characterization over wide ranges in temperature and strain-rates was found, especially for W-Ni-Cu alloys. In this work, the mechanical characterization and the consequent material modeling of the tungsten alloy INERMET® IT180 were performed. The material is actually used in the collimation system of the Large Hadron Collider at CERN and several studies are currently under development in order to be able to numerically predict the material damage in case of energy beam impact, but to do this, a confident strength model has to be obtained. This is the basis of this work, in which a test campaign in compression and tension at different strain-rates and temperatures was carried out. The dynamic tests were performed using Hopkinson Bar setups, and the heating of the specimen was reached using an induction coil system. The experimental data were, finally, used to extract the coefficient of three different material models via an analytical approach.

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“…[14,15] However, detailed studies of the microstructures and heat-treatment conditions under which adiabatic shear banding is suppressed while excellent mechanical properties are promoted, are required. For example, critical microstructural factors such as the size and volume fraction of ␣ phase and tempered martensite affect the quasi-static and dynamic deformation behavior, [13,[16][17][18] but studies on these have not been made yet.…”

Section: Introductionmentioning

confidence: 99%

Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure

Lee

et al. 2005

Metall Mater Trans A

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The effects of the volume fraction of tempered martensite on the tensile and dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure were investigated in this study. Five microstructures having various tempered-martensite volume fractions were obtained by varying heat-treatment conditions. Dynamic torsional tests were conducted on them using a torsional Kolsky bar. The test data were analyzed in relation to microstructures, tensile properties, and adiabatic shear-band formation. Under a dynamic loading condition, the maximum shear stress increased with increasing tempered-martensite volume fraction, whereas the fracture shear strain decreased. Observation of the deformed area after the dynamic torsional test indicated that a number of voids initiated mainly at ␣-phase/tempered-martensite interfaces, and that the number of voids increased with increasing martensite volume fraction. Adiabatic shear bands of 6 to 10 m in width were formed in the specimens having lower martensite volume fractions, while they were not formed in those having higher martensite volume fractions. The possibility of adiabatic shear-band formation was explained by concepts of absorbed deformation energy and void initiation.

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The mechanical properties of tungsten-based composites at very high strain rates

Cited by 77 publications

References 16 publications

Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

Mechanical characterization and modeling of the heavy tungsten alloy IT180

Effects of volume fraction of tempered martensite on dynamic deformation properties of a Ti-6Al-4V alloy having a bimodal microstructure

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