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

作　　者：Jeno Gubicza Kristián Máthis Péter Nagy Péter Jenei Zoltán Hegedus Andrea Farkas Jozef Vesely Shin-ichi Inoue Daria Drozdenko Yoshihito Kawamura 

机构地区：[1]Department of Materials Physics,Faculty of Science,Eotvos Loránd University,Pázmány P.sétány 1/A,Budapest H-1117,Hungary [2]Department of Physics of Materials,Faculty of Mathematics and Physics,Charles University,Ke Karlovu 5,12116 Praha 2,Czech Republic [3]Deutsches Elektronen-Synchrotron DESY,Notkestr.85,Hamburg 22603,Germany [4]Magnesium Research Center,Kumamoto University,2-39-1 Kurokami,Chuo-ku,Kumamoto 860-8555,Japan

出　　处：《Journal of Magnesium and Alloys》2024年第5期2024-2040,共17页镁合金学报（英文）

基　　金：financially supported by the International Visegrad Fund(project V4-Japan Joint Research Program,Ref.JP3936);the National Research,Development and Innovation Office(Contract No.:2019-2.1.7-ERANET-2021-00030);Support by the Ministry of Education,Youth and Sports of Czech Republic in the framework of Visegrad Group(V4)-Japan Joint Research Program-Advanced Materials under grant No.8F21011;supported by JST SICORP Grant Number JPMJSC2109,Japan。

摘　　要：Mg-Y-Zn-Al alloys processed by rapidly solidified ribbon consolidation(RSRC)technique exhibit an exceptional mechanical performance indicating promising application potential.This material has a bimodal microstructure consisting of fine recrystallized and coarse non-recrystallized grains with solute-rich stacking faults forming cluster arranged layers(CALs)and nanoplates(CANaPs),or complete long period stacking ordered(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(at%)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 increase 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 16-20×10^(14)m^(-2).The diffraction profile analysis indicated that most dislocations formed during tension were of non-basal and pyramidal 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 explained by a model of the interaction between prismatic dislocations and CANaPs/LPSO plates.

关 键 词：Mg-Zn-Y-Al alloy Long period stacking ordered(LPSO)phase Cluster arranged nanoplates(CANaPs) Annealing Tension Dislocation density Hardening 

分 类 号：TG146.22[一般工业技术—材料科学与工程]