Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 32, Issue 12, Pages 1274-1281Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2016.05.015
Keywords
Magnesium alloys; Equal channel angular pressing (ECAP); Long period stacking ordered (LPSO) phase; Microstructure; Mechanical property
Funding
- Natural Science Foundation of Jiangsu Province [BK20160869]
- Nantong Science and Technology Project [GY12015009]
- Fundamental Research Funds for the Central Universities [2015B01314]
- National Natural Science Foundation of China [51501039]
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The microstructure evolutions and mechanical properties of a heterogeneous Mg88Y8Zn4 (in at.%) alloy during multi-pass equal channel angular pressing (ECAP) were systematically investigated in this work. The results show that four phases, i.e. alpha-Mg, 18R long period stacking ordered (LPSO) phase, Mg24Y5 and Y-rich phase, are present in cast alloy. During ECAP, dynamic recrystallization (DRX) occurs and the diameter of DRXed alpha-Mg grains decreases to 0.8 mu m. Moreover, precipitation of lamellar 14H LPSO structure is developed within alpha-Mg phase. Both the refinement of alpha-Mg grains and precipitation of 14H LPSO contribute to the increase in micro-hardness from 98 HV to 135 HV for alpha-Mg. In addition, a simplified model describing the evolution of 18R LPSO phase is established, which illustrates that 18R undergoes a four-step morphological evolution with increasing strains during ECAP, i.e. original lath -> bent lath -> cracked lath -> smaller particles. Compression test results indicate that the alloy has been markedly strengthened after multi-pass ECAP, and the main reason for the significantly enhanced mechanical properties could be ascribed to the DRXed alpha-Mg grains, newly precipitated 14H lamellas, 18R kinking and refined 18R particles. Copyright (C) 2016, The editorial office of Journal of Materials Science & Technology. Published by Elsevier Limited.
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