Strengthening mechanisms in magnesium alloys containing ternary Ⅰ,W and LPSO phases

查看全文 作　　者：[1]N.Tahreen;D.F. [2,3]Zhang;F.S. [2,3,4]Pan;X.Q. [4,5]Jiang;D.Y. [6]Li;D.L. [1]Chen

机构地区：[1]Department of Mechanical and Industrial Engineering, Ryerson University, Toronto, Ontario, MSB 2K3, Canada;[2]College of Materials Science and Engineering, Chongqing University, Chongqing, 400045, China;[3]National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China;[4]Advanced Materials Research Center, ChongqingAcademy of Science and Technology, Chongqing, 401123, China;[5]Faculty of Materials and Energy, Southwest University, Chongqing, 400715, China;[6]Department of Chemical and Materials Engineering, University of Alberta, Alberta, T6G 11-19, Canada

出　　处：《Journal of Materials Science & Technology》索引2018年第34卷第7期,共9页

基　　金：the Natural Sciences and Engineering Research Council of Canada (NSERC);Ontario Trillium Scholarships (OTS) program for providing financial support;financial support by the Premier’s Research Excellence Award (PREA);Canada Foundation for Innovation (CFI);Ryerson Research Chair (RRC) program;the Ministry of Science and Technology of China (2014DFG52810);National Great Theoretic Research Project of China (2013CB632200);National Natural Science Foundation of China (Project 51474043);Ministry of Education of China (SRFDR 20130191110018);Chongqing Municipal Government(CSTC2013JCYJC60001);Chongqing Science and Technology Commission (CSTC2011gjhz50001) 摘　　要：This study was aimed at identifying underlying strengthening mechanisms and predicting the yield strength of as-extruded Mg-Zn-Y alloys with varying amounts of yttrium(Y) element. The addition of Y resulted in the formation of ternary I(Mg_3 YZn_6), W(Mg_3 Y_2 Zn_3) and LPSO(Mg_(12) YZn) phases which subsequently reinforced alloys ZM31 + 0.3 Y, ZM31 + 3.2 Y and ZM31 + 6 Y, where the value denoted the amount of Y element(in wt%). Yield strength of the alloys was determined via uniaxial compression testing, and grain size and second-phase particles were characterized using OM and SEM. In-situ high-temperature XRD was performed to determine the coefficient of thermal expansion(CTE), which was derived to be 1.38 × 10^(-5 K^(-1) and 2.35 × 10^(-5) K^(-1) for W and LPSO phases, respectively. The individual strengthening effects in each material were quantified for the first time, including grain refinement, Orowan looping, thermal mismatch, dislocation density, load-bearing, and particle shearing contributions. Grain refinement was one of the major strengthening mechanisms and it was present in all the alloys studied,irrespective of the second-phase particles. Orowan looping and CTE mismatch were the predominant strengthening mechanisms in the ZM31 + 0.3 Y and ZM31 + 3.2 Y alloys containing I and W phases, respectively, while load-bearing and second-phase shearing were the salient mechanisms contributing largely to the superior yield strength of the LPSO-reinforced ZM31 + 6 Y alloy. 关键词：镁合金机制科学与技术热失配粒子谷物 SEM 高温度

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Strengthening mechanisms in magnesium alloys containing ternary Ⅰ,W and LPSO phases

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