Fracture in Titanium Diboride

Vanderwalker, D. M.

doi:10.1002/pssa.2211110112

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…In summary, these studies indicated that the first cusp marks the beginning of damage, while the second represents the yield point of the HEL. In other work, TEM investigation of shocked titanium diboride (Vanderwalker 1989) showed cracking above 1.7 GPa. At higher stresses they noted nucleation and splitting of dislocation loops in the basal plane.…”

Section: Introductionmentioning

confidence: 73%

On the failure of shocked titanium diboride

Bourne

Gray

2002

Proc. R. Soc. Lond. A

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The failure of brittle materials in uniaxial compressive shock loading has been the subject of extensive recent discussion. The physical interpretation of the yielding process in titanium diboride and its Hugoniot elastic limit remain poorly defined. Titanium diboride is known to exhibit an anomalous Hugoniot containing cusps at 4.5-7 and 13-17 GPa, according to the production route adopted for the material. These features are additionally observed on the free-surface wave profiles. Various experimental and microstructural variables have been investigated to find an explanation for these features. In other ceramics, failure has been seen to occur behind a travelling boundary that follows a shock front, called a failure wave, across which the strength of the material has been shown to dramatically decrease. In order to elucidate whether the cusps in titanium diboride are related to failure processes, gauges were embedded in order to measure the lateral stress behind the shock front. As in other materials, the stress in titanium diboride was seen to rise across a failure front. However, this process only occurred over certain stress ranges. A mechanical interpretation of the shock response of titanium diboride as a function of peak shock pressure is suggested relating to the cusps observed.

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Section: Introductionmentioning

confidence: 73%

On the failure of shocked titanium diboride

Bourne

Gray

2002

Proc. R. Soc. Lond. A

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“…Verification of the hypothesis derived from kinetic data that reverted austenite forms on dislocations is presented by electron micrographs in figure 6. Vanderwalker [4] has also suggested that the sequence of heterogeneous precipitation of austenite is similar to that of precipitation on dislocations Ref. (7) DATA ON T-750 FROM PRESENT WORK 798 898 full homogeneity at 898 K even with reduced As and Af temperatures in Ni-enriched region seems to be difficult.…”

Section: Discussionmentioning

confidence: 99%

Austenite reversion in 18 Ni Co‐free maraging steel

et al. 1995

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The mechanism of austenite reversion in 18 Ni Co‐free maraging steel (250 grade) has been established by conducting extensive X‐ray diffraction (XRD) and transmission electron microscopy (TEM) under differently aged conditions. It has been proposed that contrary to the precipitate dissolution mechanism suggested for the initiation of austenite reversion in 18Ni‐8Co‐5Mo type maraging steels, the initiation of transformation of martensite to austenite in this type of maraging steel is due to the diffusion of Ni from matrix to the dislocations and other defect structures on prolonged/high temperature ageing. This results in local enrichment of Ni which lowers both AS and MS temperatures of the region. Lowering of these transformation temperatures is responsible for the early reversion of martensite to Ni‐enriched stable austenite which, on subsequent cooling to room temperature, does not transform back to martensite.

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“…Although the possibility of a phase-transition that causes one or the other of the compressive features to occur cannot be ruled out [Grady, 1992a,b], more recent studies lean toward a mechanical explanation for these behaviors [Dandekar and Benfanti, 19931. Both dislocation and microfracture features were observed in shock-recovered samples of titanium diboride wanderwalker and Croft, 1988;Vandetwalker, 1989;Winkler and Stilp, 1992;Grady and Wise, 19931. Titanium diboride ceramics from several suppliers were tested for this report. This testing of different materials-supplied by separate manufacturers-offered a valuable perspective of the dependence of the shock features in titanium diboride, as related to their differing chemistries and microstructures.…”

Section: Titanium Diboride Ceramicsmentioning

confidence: 99%

Shock compression profiles in ceramics

Grady¹,

Moody²

1996

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Fracture in Titanium Diboride

Cited by 8 publications

References 19 publications

On the failure of shocked titanium diboride

On the failure of shocked titanium diboride

Austenite reversion in 18 Ni Co‐free maraging steel

Shock compression profiles in ceramics

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