The plastic properties of high-purity W single crystals

Brunner, D.; Glebovsky, V.G.

doi:10.1016/s0167-577x(99)00200-1

Cited by 43 publications

(20 citation statements)

References 17 publications

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“…As already pointed out in Fe, the atomistic estimates of the Peierls stress in W evidence the usual discrepancy with the experimental value, i.e. about 800 MPa at 26 K [64].…”

Section: Comparison Between Bcc Fe and Wmentioning

confidence: 62%

Ab initio investigation of the Peierls potential of screw dislocations in bcc Fe and W

Ventelon¹,

Willaime²,

Clouet³

et al. 2013

Acta Materialia

123

100

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“…As already pointed out in Fe, the atomistic estimates of the Peierls stress in W evidence the usual discrepancy with the experimental value, i.e. about 800 MPa at 26 K [64].…”

Section: Comparison Between Bcc Fe and Wmentioning

confidence: 62%

Ab initio investigation of the Peierls potential of screw dislocations in bcc Fe and W

Ventelon¹,

Willaime²,

Clouet³

et al. 2013

Acta Materialia

123

100

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“…As was shown by other workers [30,31], this limitation can be considerably reduced by using single crystals with very small diameters (smaller than 1 mm). Therefore, tensile specimens with a diameter of 1 mm were prepared in several steps [24]. First, by spark-erosion rods of 1.6 mm in diameter and 27 mm in length were cut from the initial "as-grown" single crystals of * 10 mm diameter.…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of the plastic flow of high-purity tungsten single crystals

Brunner

2010

International Journal of Materials Research

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The influence of temperature on the plastic deformation of high-purity tungsten single crystals with an orientation favouring single slip on the (110) or (112) planes, has been studied using tensile tests in the temperature range 26 K to 800 K with emphasis on temperatures below 400 K. The crystals were deformed with an initial applied plastic strain rate of γa = 8.5 · 10−4 s−1 either isothermally until fracture or necking terminated the experiment (called isothermal straining tests) or in small straining intervals at different decreasing temperatures (called isothermal-straining – temperature- lowering tests). After initial plastic deformation at high enough temperatures (T ≥ 650 K; γ ≍ 0.08) tests at lower temperatures (T ≤ 400 K) reveal that the workhardening behaviour changes completely if compared with work-hardening behaviour of tests at the lower temperatures. A combination of tests suggests that work hardening of tungsten cannot be interpreted solely in terms of an increase in the athermal component of the flow stress or an exhaustion of non-screw dislocations. Rather, the results suggest that the different mobilities of screw and non-screw dislocations and their dependence on temperature and strain rate contribute essentially to work hardening at the beginning of plastic flow. Additionally, this is strongly influenced by changes of the slip systems towards the low-temperature regime below about 230 K. Consequences of these features for work hardening and its dependence on temperature, flow stress, critical resolved shear stress are analysed and discussed.

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“…They are plotted against T in the range of 50-800 K (Figure 8). The results of tensile tests in various cooling or heating conditions match in the best way [8][9][10][11][12]. Above 740 K, with increasing T, τ changes very little.…”

Section: Resultsmentioning

confidence: 86%

“…Tensile specimens are produced by a step-by-step treatment. At first, to get small rods with 1.6 mm in diameter and 27 mm in length, large AG crystals are cut [8][9][10][11][12]. Small rods are processed by a round hollow electrode to decrease in diameter of a gauge part.…”

Section: Tensile Samplesmentioning

confidence: 99%

Introductory Chapter: Growing W Single Crystals by EBFZM for Studying Mechanical Behavior

Glebovsky¹

2019

Crystal Growth

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The plastic properties of high-purity W single crystals

Cited by 43 publications

References 17 publications

Ab initio investigation of the Peierls potential of screw dislocations in bcc Fe and W

Ab initio investigation of the Peierls potential of screw dislocations in bcc Fe and W

Temperature dependence of the plastic flow of high-purity tungsten single crystals

Introductory Chapter: Growing W Single Crystals by EBFZM for Studying Mechanical Behavior

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