Precipitation Behavior of Mg-7Gd-3Y-2Zn-0.5Zr Alloy during Isothermal Aging
| Autor: | Li Yongjun, Shi Guoliang, Wei Liu, Minglong Ma, Ting Li, Jiawei Yuan, Li Xinggang, Zhiwei Du, Zhang Kui, Yong-gang Peng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Alloy 02 engineering and technology Crystal structure engineering.material precipitation 01 natural sciences lcsh:Technology Isothermal process Article 0103 physical sciences General Materials Science Magnesium alloy LPSO lcsh:Microscopy lcsh:QC120-168.85 010302 applied physics lcsh:QH201-278.5 Precipitation (chemistry) lcsh:T magnesium alloy 021001 nanoscience & nanotechnology Crystallography Transmission electron microscopy lcsh:TA1-2040 Precipitation types engineering lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering Dislocation 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 |
| Zdroj: | Materials, Vol 14, Iss 1737, p 1737 (2021) Materials Volume 14 Issue 7 |
| ISSN: | 1996-1944 |
| Popis: | Precipitate phases in an Mg–7Gd–3Y–2Zn–0.5Zr alloy aged isothermally at 240 °C were examined using high-resolution transmission electron microscopy (TEM) and high-angle annular dark-field scanning TEM. The two types of precipitation sequence that involve Mg–Gd and long period stacking ordered (LPSO) type were found. The LPSO type sequence consisted of the precipitation of γ′′, γ′, 14H-LPSO/18R-LPSO. The Mg–Gd type precipitation sequence involved the formation of β′(b.c.o.) and β1(f.c.c.). The sequence, morphology, distribution, and crystal structure of these precipitates formed during isothermal aging were investigated. The results indicated that the priority precipitation of Mg–Gd and LPSO type sequences during aging can be affected by Nd, which has a higher diffusion coefficient than Gd and Y. The dislocation structures and strengthening mechanism were also discussed. |
| Databáze: | OpenAIRE |
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