An Investigation on Microstructure Evolution, Mechanical Properties, and Strain Aging of Mg-1.8Zn-0.7Si-0.4Ca Biomedical Alloy Processed by Equal Channel Angular Pressing

Journal Article · Thu Aug 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04218-5· OSTI ID:22970568

Shaeri, M. ^[1]; Karimi Taheri, K. ^[2]; Shaeri, M. H. ^[3]

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1. Sharif University of Technology, Department of Materials Science and Engineering (Iran, Islamic Republic of)
2. Northeastern University, Mechanical and Industrial Engineering Department (United States)
3. Imam Khomeini International University, Department of Metallurgy and Materials Engineering, Engineering Faculty (Iran, Islamic Republic of)

The influence of equal channel angular pressing (ECAP) on microstructure and mechanical behavior, as well as, strain aging during ECAP and post-ECAP of Mg-1.8Zn-0.7Si-0.4Ca biomedical alloy was examined. The alloy in solid solution heat-treated condition was processed by ECAP with route B{sub C} at 350 and 400 °C. The specimens ECAPed at 350 °C were aged at 125 and 150 °C for different times. The hardness and shear punch test results indicated that performing ECAP at 350 °C for 4 passes increases the hardness and shear strength of the alloy from 48 HV and 110 MPa to 71 HV and 188 MPa, respectively. It was revealed that the average grain size of the alloy decreases from 78 µm to about 3 µm after 4 passes of ECAP. Three precipitates of CaMgSi, Ca{sub 2}Mg{sub 6}Zn{sub 3}, and Mg{sub 2}Si were detected in the solid solution specimen. After 4 passes of ECAP at 350 °C, Ca{sub 2}Mg{sub 6}Zn{sub 3} was completely dissolved and the morphology of Mg{sub 2}Si changed from Chinese script to fiber-shaped particles. Dynamic strain aging occurred at high-temperature ECAP, and the specimens were overaged during post-ECAP aging. Small MgZn particles were detected in the overaged sample.

• OSTI ID: 22970568
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 8 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL LATTICES
CRYSTALLIZATION
CRYSTALS
GRAIN SIZE
HARDNESS
HEAT TREATMENTS
MAGNESIUM ALLOYS
MAGNESIUM SILICIDES
PRESSING
SHEAR PROPERTIES
SOLID SOLUTIONS
STRAIN AGING
STRAINS