In-situ synthesis of Mg-based bulk metallic glass matrix composites with primary α-Mg phases
| Autor: | Eun Soo Park, Kook Noh Yoon, Wookha Ryu, Je In Lee |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
In situ
Amorphous metal Materials science Mechanical Engineering Metals and Alloys 02 engineering and technology Work hardening Plasticity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Specific strength Matrix (chemical analysis) Shear (sheet metal) Flexural strength Mechanics of Materials Materials Chemistry Composite material 0210 nano-technology |
| Zdroj: | Journal of Alloys and Compounds. 879:160417 |
| ISSN: | 0925-8388 |
| Popis: | Herein, we systematically investigate the in-situ synthesis and mechanical properties of Mg-based bulk metallic glass matrix composites (BMGMCs). From a well-known Mg65Cu25Gd10 bulk glass former, a series of Mg65+xCu20–2x/3Zn5Gd10−x/3 (x = 0–18 at%) alloys are systematically designed and Mg-rich (>77 at% Mg) glassy/crystalline matrix composites containing primary α-Mg phases are successfully developed. Mg77Cu12Zn5Gd6 BMGMC (x = 12 at%) exhibits over two times higher compressive fracture strength (773 ± 20.6 MPa) and specific strength (2.6 × 105 N m kg−1) than commercial Mg alloys such as AZ31 or AZ91. In particular, compared with monolithic Mg-based BMGs, the BMGMC displays obvious yielding, serrated plastic flow and plastic strain of 0.22 ± 0.02%. This result is attributed to the dispersed primary α-Mg phases which prevent the rapid propagation of shear bands and promote the formation of multiple shear bands. The Mg-rich crystalline matrix composites (x = 14-18 at%) containing primary α-Mg phases exhibit an enhancement in the plastic strain (from 0% to 1.51%) and pronounced work hardening at the expense of yield strength ( |
| Databáze: | OpenAIRE |
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