The evolution of non-basal dislocations as a function of deformation temperature in pure magnesium determined by X-ray diffraction

Máthis, Kristián; Nyilas, K.; Axt, A.; Dragomir-Cernatescu, I.; Ungár, Tamás; Lukáč, P.

doi:10.1016/j.actamat.2004.02.034

Cited by 213 publications

(101 citation statements)

References 21 publications

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“…The increase of the relative fraction of hc þ ai dislocations is resulted by the strong deformation at high temperature. This phenomena was also observed for pure Mg deformed at high temperature [100]. The specimen processed by 8 ECAP passes was further deformed by tension at different temperatures [98].…”

Section: à2mentioning

confidence: 76%

“…The relatively high fraction of hc þ ai dislocations in Ti processed by ECAP can be attributed to the high temperature of deformation. Theoretical calculations and TEM observations for hexagonal metallic materials suggest the activation of hc þ ai dislocations by strong deformation at elevated temperatures [100]. At room temperature the critical resolved shear stress of pyramidal hc þ ai dislocations is about five times larger than that for basal slip [101], but this value decreases with increasing temperature.…”

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 95%

“…A computer program was elaborated to determine the Burgers vector population from the measured values of q1 and q2. The detailed description of the procedure is given in reference [100]. In the following sections, the results obtained on the dislocation structures in bulk hexagonal nanomaterials by X-ray line profile analysis are summarized.…”

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 99%

See 2 more Smart Citations

Nanocrystalline materials studied by powder diffraction line profile analysis

Ungár¹,

Gubicza²

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. X-ray powder diffraction is a powerful tool for characterising the microstructure of crystalline materials in terms of size and strain. It is widely applied for nanocrystalline materials, especially since other methods, in particular electron microscopy is, on the one hand tedious and time consuming, on the other hand, due to the often metastable states of nanomaterials it might change their microstructures. It is attempted to overview the applications of microstructure characterization by powder diffraction on nanocrystalline metals, alloys, ceramics and carbon base materials. Whenever opportunity is given, the data provided by the X-ray method are compared and discussed together with results of electron microscopy. Since the topic is vast we do not try to cover the entire field.

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Section: à2mentioning

confidence: 76%

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 95%

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 99%

See 1 more Smart Citation

Nanocrystalline materials studied by powder diffraction line profile analysis

Ungár¹,

Gubicza²

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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“…For example, as-cast magnesium exhibits less than 10% elongation in tension when testing at a strain rate of 3.3 × 10 -5 s -1 [35] and rolled magnesium exhibits less than 5% elongation at a strain rate of 1.7 × 10 -3 s -1 [36]. Nevertheless, the present results show elongations larger than 100% in HPT-processed magnesium at strain rates at and below 10 -3 s -1 including an exceptional elongation of ~360% at 10 -5 s -1 .…”

Section: An Examination Of the Enhanced Ductilitymentioning

confidence: 99%

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

et al. 2017

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An investigation was conducted to examine the mechanical behavior and microstructure evolution during deformation of ultrafine-grained pure magnesium at low temperatures within the temperature range of 296 -373 K. Discs were processed by high-pressure torsion until saturation in grain refinement. Dynamic hardness testing revealed a gradual increase in strain rate sensitivity up to m ≈ 0.2. High ductility was observed in the ultrafine-grained magnesium including an exceptional elongation of ~360% in tension at room temperature and stable deformation in micropillar compression. Grain coarsening and an increase in frequency of grain boundaries with misorientations in the range 15°  45° occurred during deformation in tension. The experimental evidence, when combined with an analysis of the deformation behavior, suggests that grain boundary sliding plays a key role in low strain rate deformation of pure magnesium when the grain sizes are at and below ~5 µm.

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“…The eleven dislocation slip systems can be classified into three groups based on their Burgers vectors: b 1 =1/3<-2110> (<a> type), b 2 =<0001> (<c> type) and b 3 =1/3<-2113> (<c+a> type). A computer program was elaborated to determine the Burgers vector population from the experimental values of q 1 and q 2 [17]. There are 4, 2 and 5 slip systems in the <a>, <c> and <c+a> Burgers vector groups, respectively.…”

Section: Az91 Mg Alloy Deformed By Ecapmentioning

confidence: 99%

Microstructure of severely deformed metals from X-ray line profile analysis

Gubicza,

Nam,

Máthis

et al. 2006

Ninth European Powder Diffraction Conference

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Abstract. Two essentially different materials, cubic Ti 49.8 Ni 50.2 shape memory alloy and hexagonal AZ91 Mg alloy, were deformed by equal channel angular pressing (ECAP). The microstructure developed as a result of severe plastic deformation was studied by X-ray line profile analysis. The correlation between the microstructure and the mechanical behavior was also investigated. Below 100 °C the tensile strength of the Mg alloy increased as a consequence of the increase of the dislocation density owing to ECAP. Above 200 °C the strength decreased and the ductility increased as a result of the breakage of the Al 12 Mg 17 precipitates due to ECAP. The analysis of the dislocation contrast factors of Ti 49.8 Ni 50.2 revealed that <100>{110} dislocations with <111> line vector formed during ECAP.

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The evolution of non-basal dislocations as a function of deformation temperature in pure magnesium determined by X-ray diffraction

Cited by 213 publications

References 21 publications

Nanocrystalline materials studied by powder diffraction line profile analysis

Nanocrystalline materials studied by powder diffraction line profile analysis

Evidence for exceptional low temperature ductility in polycrystalline magnesium processed by severe plastic deformation

Microstructure of severely deformed metals from X-ray line profile analysis

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