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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

Shaeri, M ; Sharif University of Technology | 2019

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-019-04218-5
  3. Publisher: Springer New York LLC , 2019
  4. Abstract:
  5. 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 BC 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, Ca2Mg6Zn3, and Mg2Si were detected in the solid solution specimen. After 4 passes of ECAP at 350 °C, Ca2Mg6Zn3 was completely dissolved and the morphology of Mg2Si 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. © 2019, ASM International
  6. Keywords:
  7. Magnesium alloy ; Calcium alloys ; Grain size and shape ; Hardness ; Magnesium alloys ; Mechanical properties ; Microstructure ; Morphology ; Pressing (forming) ; Silicon alloys ; Solid solutions ; Strain ; Ternary alloys ; Average grain size ; Biomedical alloys ; Dynamic strain aging ; Mechanical behavior ; Micro-structure evolutions ; Shear-punch tests ; Solution heat treated ; Strain aging ; Equal channel angular pressing
  8. Source: Journal of Materials Engineering and Performance ; Volume 28, Issue 8 , 2019 , Pages 5207-5219 ; 10599495 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11665-019-04218-5