On the anisotropy of the Portevin–Le Chatelier plastic instabilities in Al–Li–Cu–Zr alloy

Mizera, J.; Kurzydłowski, Krzysztof J.

doi:10.1016/s1359-6462(01)01099-5

Cited by 23 publications

(10 citation statements)

References 20 publications

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“…Such a structure witness to the trend to concentrate local plastic deformations. Observations obtained during investigation are similar to another works [8,9]. Presented results demonstrate the presence of the band structure.…”

Section: Resultssupporting

confidence: 90%

“…Heat treatment of alloy II increases the value of yield strength up to 450 MPa. The obtained values clearly demonstrate the increase of yield strength after complex deformation compare to the sample after only CR processyield strength about 280 MPa for Al-Li-Zr and 320 MPa for Al-Li-Cu-Zr alloy [9]. Different values are a consequence of changes in microstructure (grains size) of the samples.…”

Section: Resultsmentioning

confidence: 74%

“…It was noticed that was not significant changes in grain size as a result of additional CR process at the sample I according to the results presented at work [8] Based on results of the microhardness it could be concluded the anisotropy of the mechanical properties in investigated alloys. This could be due to the tendency to locate the plastic deformation in the form of deformation bands [9,10]. This process is strong related with the kind of crystallographic texture [11].…”

Section: Resultsmentioning

confidence: 99%

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The influence of the complex deformation on the microstructure and mechanical properties of the model Al-Li alloys

2016

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The present study demonstrate the effect of the combined deformation (hydrostatic extrusion and rolling) on microstructure and mechanical properties of model AlLi alloys. It has been shown the anisotropy of material structure and properties. Additionally it has been demonstrated increase of yield strength at the result of the plastic deformation. KEYWORDS: Al-Li alloy, hydrostatic extrusion, microstructure and properties W pracy przedstawiono wpływ łączonego odkształcenia wyciskania hydrostatycznego i walcowania na zimno na mikrostrukturę i właściwości modelowych stopów Al-Li. Badania wykazały obecność anizotropii struktury materiału i właściwości. Ponadto przedstawiono wzrost wła-ściwości wytrzymałościowych w wyniku odkształcenia plastycznego. SŁOWA KLUCZOWE: stopy Al-Li, wyciskanie hydrostatyczne, mikrostruktura i właściwości Al-Li alloys are extensively used in many areas of industry, especially the aircraft, because of low density and strong ability to hardening. They are suitable materials for basic investigation, where are interested in the interaction between deformation and microstructure [1÷5]. One of the method of strengthening is plastic deformation or heat treatment. The aim of the present study was analyzed of complex deformation influence on the microstructure and mechanical properties of the model Al-Li alloys. Materials and methodsThe materials used in the investigations were two model aluminum -lithium alloys of a chemical composition (wt. %) given in Tab. I. The second alloy was subjected the additional heat treatment (heat treated at 823 K for 10 h and subsequently water-quenched to room temperature and than aging at 473 K for 2 h -T6 treatment).In the first step the alloys were deformed by hydrostatic extrusion (HE) method in the range of the true strain ε = 2.4. The second step the bars were cold rolled (CR) in accordance with direction of the extrusion process. Finally the samples, as a result of plastic deformation had about 4 mm width and 1 mm of thickness.The structures of the deformed samples was examined on transverse and longitudinal sections to the extrusion direction. Microstructures were examined by light microscopy with polarized light beam (LM) and transmission electron microscope (TEM) at an accelerating voltage of 120 keV. The obtained images (perpendicular and parallel sections) were analyzed quantitatively by the stereological methods using special software for image analysis [6]. The grain sizes were determined for more than 400 randomly selected grains. In order to determine mechanical properties tests such as microhardness measurements (HV 0.2) and compression test were performed. A microhardness measurements were carried out for the samples at perpendicular and parallel sections as well. Presented values are average from 30 measurements each. From the compression test were appointed the yield strength value only. Because of small dimensions of samples yield strength were define by compression test. The obtained results well correspond to the values presented on the work [...

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 99%

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The influence of the complex deformation on the microstructure and mechanical properties of the model Al-Li alloys

2016

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“…The phenomenon of PL effect anisotropy was observed for the first time in works (Mizera & Kurzydłowski, 2001;Pawełek et al, 1998). The present research was carried out in order to confirm the anisotropy of the both AE and PL phenomena as well as to study the possibility of the occurrence of PL and/or AE effects also in materials processed with intensive deformation techniques (Pawełek et al, 2007(Pawełek et al, , 2009 Moreover, when analyzing the plots in Fig.…”

Section: Anisotropy Of Ae and Pl Effects In Al Alloysmentioning

confidence: 90%

Mechanical Behavior and Plastic Instabilities of Compressed Al Metals and Alloys Investigated with Intensive Strain and Acoustic Emission Methods

Pawełek¹

2011

Recent Trends in Processing and Degradation of Aluminium Alloys

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“…This localization of slip is promoted by the shearing of Al 2 CuLi precipitates and their mechanical dissolution. The mechanism of formation of the initiation of serration can be considered to involve the following steps [12,13]. The dislocation movement is discontinuous.…”

Section: Resultsmentioning

confidence: 99%

Uniaxial Loading Deformation Tests in Studying Serration Flow of Alloy C460

Mohamed¹

2013

IOSRJEN

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-The serration flow behavior of as received and heat treated aluminum-copper-lithium alloy C460 was studied at constant strain rate and at room temperature. The observed serrated flow was similar to that observed in heat treated alloy. A very characteristic feature of deformation in this alloy was the presence of precipitates and micro slips. The suggested mechanism of serrated flow maybe involves the creation of micro slips formed by shearing of the Al 2 CuLi precipitates which results in restraining of dislocations.

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On the anisotropy of the Portevin–Le Chatelier plastic instabilities in Al–Li–Cu–Zr alloy

Cited by 23 publications

References 20 publications

The influence of the complex deformation on the microstructure and mechanical properties of the model Al-Li alloys

The influence of the complex deformation on the microstructure and mechanical properties of the model Al-Li alloys

Mechanical Behavior and Plastic Instabilities of Compressed Al Metals and Alloys Investigated with Intensive Strain and Acoustic Emission Methods

Uniaxial Loading Deformation Tests in Studying Serration Flow of Alloy C460

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