Effects of repeated plastic working(RPW) on microstructure and mechanical properties of Mg2 Si/Mg-5Zn-2. 5Er composites
Mg2Si/Mg-5Zn-2. 5Er composites were fabricated by repeated plastic working (RPW) via solid state reaction and hot extrusion. Number of RPW was 100, 200, 300 and 400, respectively. Effects of RPW times on microstructure and mechanical properties of the composites were investigated by XRD (X-ray diffraction), SEM (scanning electron microscope) and OM (optical microscope). The results show that with increasing in RPW times, size of Mg2Si phase is gradually decreased with more uniform distribution. With 200 times RPW, the composites exhibit desirable comprehensive mechanical properties, and average grain size in the composites reaches 1. 8 μm, decreased by 81. 6% compared with that of samples without RPW, which is attributed to the grain refinement caused by repeated plastic deformation and grain growth caused by dynamic recrystallization during solid state reaction and hot extrusion. In addition, tensile strength reaches 394MPa, increased by 25. 4% compared with that of ones without RPW, and elongation makes 5. 5%. The strengthening mechanism of the prepared composites is characterized by grain refinement.
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Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Materials