Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 615, Issue -, Pages 424-432Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.06.211
Keywords
Magnesium alloy; Strain hardening; Yttrium; Rare-earth element; I-, W- and X-phases
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- AUTO21 Network of Centres of Excellence
- Premier's Research Excellence Award (PREA)
- NSERC-Discovery Accelerator Supplement (DAS) Award
- Automotive Partnership Canada (APC)
- Canada Foundation for Innovation (CFI)
- Ryerson Research Chair (RRC) program
- Ministry of Science and Technology of China [2011DFR50950-05, 2014DFG 52810]
- Chongqing Science and Technology Commission [CSTC2009BA4045, CSTC2011gjhz50001]
- National Great Theoretic Research Project of China [2013CB632200]
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The aim of this study was to identify the effect of yttrium (Y) addition on the phase development and strain hardening behavior of an extruded Mg-Zn-Mn (ZM31) magnesium alloy. The addition of a small amount (0.3 wt.%) of Y in the alloy led to the formation of icosahedral quasicrystalline I (Mg3YZn6) phase. Both I-phase and W-phase (Mg3Y2Zn3) were present in the extruded ZM31+3.2Y alloy, while long period stacking ordered (LPSO) X-phase (Mg12YZn) and Mg24Y5 were observed in the extruded ZM31+6Y alloy. The Y addition significantly refined grains in the extruded state. The presence of I-phase in the extruded ZM31+0.3Y alloy increased hardness, compressive yield strength, and Stage B strain hardening rate. The extruded ZM31+3.2Y alloy exhibited a lower hardness and Stage B hardening rate due to the formation of W-phase. Both extruded ZM31+0.3Y and ZM31+3.2Y alloys showed a yield point phenomenon with an initial negative strain hardening rate. The extruded ZM31+6Y alloy had a high hardness and compressive yield strength without Stage B hardening, suggesting a change of major deformation mode from twinning to slip mainly due to the role of LPSO X-phase. After solution treatment and aging, the hardness and compressive yield strength gradually increased with increasing Y content, while the strain hardening exponent and the extent of Stage B strain hardening decreased due to the dissolution of I- and W-phases and the presence of LPSO X-phase. (C) 2014 Elsevier B.V. All rights reserved.
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