首页|In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique

In-situ study of the microstructure evolution during tension of a Mg-Y-Zn-Al alloy processed by rapidly solidified ribbon consolidation technique

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Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance in-dicating promising application potential.This material has a bimodal microstructure consisting of fine recrystallized and coarse nonrecrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking or-dered(LPSO)phase.In order to reveal the deformation mechanisms,in-situ synchrotron X-ray diffraction line profile analysis was employed for a detailed study of the dislocation arrangement created during tension in Mg-0.9％Zn-2.05％Y-0.15％Al(atomic percent)alloy.For uncovering the effect of the initial microstructure on the mechanical performance,additional samples were obtained by annealing of the as-consolidated specimen at 300 ℃ and 400 ℃ for 2 h.The heat treatment at 300 ℃ had no significant effect on the initial microstructure,its evolution during tension and,thus,the overall deformation behavior under tensile loading.On the other hand,annealing at 400 ℃ resulted in a significant in-crease of the recrystallized grains fraction and a decrease of the dislocation density,leading to only minor degradation of the mechanical strength.The maximum dislocation density at the failure of the samples corresponding to the plastic strain of 10％-25％was estimated to be about 16 × 1014-20 × 1014 m-2.The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal<a>and pyramidal<c+a>types,what was also in agreement with the Schmid factor values revealed independently from orientation maps.It was also shown that the dislocation-induced Taylor hardening was much lower below the plastic strain of 3％than above this value,which was ex-plained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.

Mg-Zn-Y-Al alloyLong period stacking ordered(LPSO)phaseCluster arranged nanoplates(CANaPs)AnnealingTensionDislo-cation densityHardening

Jen? Gubicza、Kristián Máthis、Péter Nagy、Péter Jenei、Zoltán Hegedüs、Andrea Farkas、Jozef Vesely、Shin-ichi Inoue、Daria Drozdenko、Yoshihito Kawamura

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Department of Materials Physics,Faculty of Science,Eötvös Loránd University,Pázmány P.sétány 1/A,Budapest H-1117,Hungary

Department of Physics of Materials,Faculty of Mathematics and Physics,Charles University,Ke Karlovu 5,121 16 Praha 2,Czech Republic

Deutsches Elektronen-Synchrotron DESY,Notkestr.85,Hamburg 22603,Germany

Magnesium Research Center,Kumamoto University,2-39-1 Kurokami,Chuo-ku,Kumamoto 860-8555,Japan

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International Visegrad Fund(project V4-Japan Joint Research Program)National Research,Development and Innovation OfficeMinistry of Education,Youth and Sports of Czech Republic in the framework of Visegrad Group(V4)-Japan Joint Research ProgramJST SICORP ,Japan

JP39362019-2.1.7-ERA-NET-2021-000308F21011JPMJSC2109

2024

10.1016/j.jma.2024.05.008

镁合金学报(英文)

镁合金学报(英文)

EI
ISSN：2213-9567
年,卷(期)：2024.12(5)