Microstructure and mechanical behavior of AZ91 Mg alloy processed by equal channel angular pressing

Máthis, Krisztián; Gubicza, Jenő; Nam, Nguyễn Hoàng

doi:10.1016/j.jallcom.2004.10.050

Cited by 195 publications

(87 citation statements)

References 21 publications

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“…The relative fractions of the hai, hci and hc þ ai Burgers vectors are 62%, 0-4% and 32-36%, respectively. The abundance of hai-type dislocations besides the hci-and hc þ ai-type dislocations has been also found for other bulk hexagonal nanomaterials, e.g sintered WC [99] and SPD processed Mg alloys [98]. The relatively high fraction of hc þ ai dislocations in Ti processed by ECAP can be attributed to the high temperature of deformation.…”

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 64%

“…on commercially pure Ti [73,82,88,[94][95][96][97] and AZ91 Mg alloy [98]. Generally, the SPD processes on hexagonal materials are carried out at elevated temperatures because the rigidity of the specimens at room temperature.…”

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 99%

“…This can be explained by the fact that the hc þ ai-type dislocations have larger Burgers vectors and consequently higher formation energies than other two types. The ECAP process of AZ91 magnesium alloy was also carried out at high temperature (270 C) [98]. The main alloying elements in the AZ91 alloy are 9 wt% Al, 1 wt% Zn and 0.2 wt% Mn.…”

Section: à2mentioning

confidence: 99%

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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: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 64%

Section: The Determination Of Active Slip Systems In Hexagonal Closedmentioning

confidence: 99%

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Nanocrystalline materials studied by powder diffraction line profile analysis

Ungár¹,

Gubicza²

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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“…During high temperature ECAP Al 12 Mg 17 precipitates are formed. Scanning electron microscopy (SEM) investigations reveal that these precipitates have rod-like shape which breaks into smaller parts owing to severe shear deformation during ECAP [15]. X-ray line profile analysis of the reflections of the Mg alloys shows that ECAP results in the reduction of the crystallite size from 253±38 nm to 97±10 nm and the increase of the dislocation density from 0.4±0.1⋅10 14 m -2 to 2±0.2⋅10 14 m -2 .…”

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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“…Some researchers have successfully applied hot deformation processes, such as hot compression [23], extrusion [24], equal channel angular pressing (ECAP) [25], and hot rolling [26], to as-cast AZ91 alloy and improved its mechanical properties to broaden the application potential for this alloy. However, studies on the hot deformation behavior of AZ91 alloy are relatively scarce [27,28]; and very limited data are available on this alloy's workability characteristics.…”

Section: Introductionmentioning

confidence: 99%

Hot deformation behavior and workability characteristics of AZ91 magnesium alloy powder compacts—A study using processing map

Taleghani

Torralba

2013

Materials Science and Engineering: A

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This study examined the hot deformation behavior and workability characteristics of AZ91 Mg alloy powder compacts by performing hot compression tests with a Gleeble 3800 machine. To this end, powder compacts with a relative green density of 93% were hot-compressed at temperatures ranging from 150 1Cto5001C and at true strain rates ranging from 0.001 s −1 to 10 s −1 . The true stress-true strain curves peaked at low strains, after which the flow stress increased slightly or remained constant. The work hardening rate decreased with increasing deformation temperature or strain rate. Processing maps were developed for all of the hot compression tests at strains of 0.1, 0.5, and 0.8, which represented a safe deformation domain at deformation temperatures and strain rates in the ranges of 150-300 1C and 0.001-0.01 s −1 . Kinetic analysis of the flow stress data for the safe deformation domain yielded an activation energy of 75 kJ/mol which is lower than those previously reported for the hot compression of bulk AZ91 Mg alloy. According to the developed processing maps and the microstructures of the hot-compressed specimens, the optimum hot working window for AZ91 Mg alloy powder compacts was determined to lie between 275-325 1C and 0.001-0.01 s −1 .

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Microstructure and mechanical behavior of AZ91 Mg alloy processed by equal channel angular pressing

Cited by 195 publications

References 21 publications

Nanocrystalline materials studied by powder diffraction line profile analysis

Nanocrystalline materials studied by powder diffraction line profile analysis

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

Hot deformation behavior and workability characteristics of AZ91 magnesium alloy powder compacts—A study using processing map

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