The mechanical behavior of polycrystalline hafnium: strain-rate and temperature dependence

Yadav, Sandeep; Ramesh, K.T.

doi:10.1016/s0921-5093(97)00746-6

Cited by 21 publications

(11 citation statements)

References 26 publications

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“…This is likely due to the high purity of the Hf used in the study and is discussed in further detail elsewhere. [3,18] For easy comparison, Table III gives the flow stresses at 5 pct strain for both materials and failure data for specimens tested in tension. As given in Table III, the ultimate tensile strength (UTS) for Zr (280 MPa) is found to be lower than that for Hf (460 MPa).…”

Section: A Mechanical Behaviormentioning

confidence: 99%

Mechanical behavior of zirconium and hafnium in tension and compression

Addessio

Cerreta

Gray

2005

Metall Mater Trans A

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The mechanical behavior and substructural evolution of highly textured hafnium (Hf) has been examined in tension and compression and compared to the mechanical response of zirconium (Zr). The quasi-static work-hardening rate as a function of strain for both metals exhibits a compression-tension asymmetry. Both Zr and Hf exhibit a downward work-hardening response in tension, while each displays a parabolic and then concave upward work-hardening behavior in compression. Additionally, Hf displays higher flow stresses than Zr both in tension and compression. The stress-strain and strain-hardening curves for Zr and Hf have been characterized in terms of their propensity for deformation twinning and evolution of substructure with strain. Differences in the work-hardening rates and flow stresses as a function of the sense of the applied load and material are discussed in terms of slip-twin interactions during deformation.

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Section: A Mechanical Behaviormentioning

confidence: 99%

Mechanical behavior of zirconium and hafnium in tension and compression

Addessio

Cerreta

Gray

2005

Metall Mater Trans A

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“…Included in Table II are the strain-rate sensitivities and the rates of work hardening calculated from commercial-purity hafnium test data (IP orientation) found in the literature. [20] From these results, it is clear that the increased impurity content not only increases the rate of work hardening for a given strain rate and temperature, but that the mechanical response is less sensitive to strain rate in the commercial-purity material. Additionally, the yield stresses from the IP data in this study are substantially lower than those reported for commercialpurity materials.…”

Section: The Effects Of Composition On the Mechanical Behaviormentioning

confidence: 91%

“…Das et al and Yadav et al observed a similar behavior in specimens loaded in the IP direction; however, the stages were more pronounced in those studies. [16,20] The TT case does not display the same initial stages of hardening and, instead, the stress-strain data exhibit a concave downward hardening response after yielding. The TT specimens strain harden rapidly early in the test, followed by a rapidly falling work-hardening rate.…”

Section: A the Effect Of Texture On The Mechanical Behaviormentioning

confidence: 94%

“…For higher-purity Hf, a more-coarsely-grained material (25 m grain size), slip and twinning increased with increasing strain rates and the yield stress increased with increasing strain rate or decreasing temperature, just as in the case of zirconium. [20,21] In the cases of both the commercial-purity and the higher-purity hafnium materials mentioned earlier, shear instabilities were seen to develop during deformation in compression and led to specimen failure through complete shear at strains of less than 40 pct.…”

Section: Introductionmentioning

confidence: 99%

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The influence of texture, strain rate, temperature, and chemistry on the mechanical behavior of hafnium

Cerreta

Gray

2004

Metall Mater Trans A

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The compressive mechanical behavior of highly textured, polycrystalline hafnium has been examined as a function of texture, strain rate, temperature, and material chemistry. The microstructural and substructural evolution in Hf was also examined as a function of texture. Decreasing temperature, increasing strain rate, and increasing impurity concentrations were found to increase the yield-stress and work-hardening rates, as well as increase the amount of twinning in Hf. Crystallographic texture was found to exhibit the most marked effect on the mechanical behavior of Hf. Differences in the orientation of the c-axis with respect to the loading direction were found to affect the yield stress, work-hardening behavior, and anisotropy of the tested specimen, with the highest yield stresses and rates of work hardening and the lowest anisotropies in specimens compressed along the c-axis. The amount of deformation twinning and the slip systems activated during deformation were seen to vary based on texture and are shown to correlate well with the observed yield stresses and work-hardening behaviors.

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“…The pressure-shear technique has been applied to a range of solid materials including aluminum [Yadav and Ramesh, 1998], hafnium [Yadav et al, 1995], tantalum [Duprey and Clifton, 2000], glass [Sundaram and Clifton, 1998], and SiC [Yuan et al, 2001]. In somewhat modified configurations, the technique has also been applied to measure the viscosity of fluids [Ramesh and Clifton, 1987] and friction at sliding interfaces [Yuan et al, 2009].…”

Section: Introductionmentioning

confidence: 99%

Pressure-shear experiments on granular materials.

Reinhart

Thornhill²,

Vogler³

et al. 2011

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Pressure-shear experiments were performed on granular tungsten carbide and sand using a newlyrefurbished slotted barrel gun. The sample is a thin layer of the granular material sandwiched between driver and anvil plates that remain elastic. Because of the obliquity, impact generates both a longitudinal wave, which compresses the sample, and a shear wave that probes the strength of the sample. Laser velocity interferometry is employed to measure the velocity history of the free surface of the anvil. Since the driver and anvil remain elastic, analysis of the results is, in principal, straightforward.Experiments were performed at pressures up to nearly 2 GPa using titanium plates and at higher pressure using zirconium plates. Those done with the titanium plates produced values of shear stress of 0.1-0.2 GPa, with the value increasing with pressure. On the other hand, those experiments conducted with zirconia anvils display results that may be related to slipping at an interface and shear stresses mostly at 0.1 GPa or less. Recovered samples display much greater particle fracture than is observed in planar loading, suggesting that shearing is a very effective mechanism for comminution of the grains.3

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The mechanical behavior of polycrystalline hafnium: strain-rate and temperature dependence

Cited by 21 publications

References 26 publications

Mechanical behavior of zirconium and hafnium in tension and compression

Mechanical behavior of zirconium and hafnium in tension and compression

The influence of texture, strain rate, temperature, and chemistry on the mechanical behavior of hafnium

Pressure-shear experiments on granular materials.

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