Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 34, Issue 7, Pages 1110-1118Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2017.12.005
Keywords
Magnesium alloy; I-phase; W-phase; LPSO phase; Strengthening mechanism
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Ontario Trillium Scholarships (OTS) program
- Premier's Research Excellence Award (PREA)
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
- Ministry of Science and Technology of China [2014DFG52810]
- National Great Theoretic Research Project of China [2013CB632200]
- National Natural Science Foundation of China [51474043]
- Ministry of Education of China [SRFDR 20130191110018]
- Chongqing Municipal Government [CSTC2013JCYJC60001]
- Chongqing Science and Technology Commission [CSTC2011gjhz50001]
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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 (Mg3YZn6), W (Mg3Y2Zn3) and LPSO (Mg12YZn) phases which subsequently reinforced alloys ZM31 +0.3Y, ZM31 + 3.2Y and ZM31 + 6Y, 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 x 10(-5) K-1 and 2.35 x 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 + 0.3Y and ZM31 + 3.2Y 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 + 6Y alloy. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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