| Autor: |
Keitaro Enami, Katsuyoshi Kondoh, Takanori Igarashi, Junko Umeda, Masaki Ohara, Junji Fujita, Hisashi Imai |
| Rok vydání: |
2011 |
| Předmět: |
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| Zdroj: |
Materials Chemistry and Physics. 129:631-640 |
| ISSN: |
0254-0584 |
| DOI: |
10.1016/j.matchemphys.2011.05.017 |
| Popis: |
AZ61B alloy powder composite with Al 2 Ca fine dispersoids was developed by using CaO additive particles as raw materials. For synthesis of Al 2 Ca in the matrix, CaO particles were elementally and uniformly mixed with AZ61B alloy chips via ECABMA process. The mechanism in formation of Al 2 Ca intermetallics was investigated by XRD and SEM–EDS analysis when AZ61B alloy green compacts containing CaO additives were heat treated at 380–625 °C in argon gas atmosphere. A change in a standard free energy in formation of Al 2 Ca via reaction between CaO and Mg–Al alloy was calculated by using a standard Gibbs free energy of each element contained in the green compact. Both of the theoretical analysis by thermo-dynamic and experimental investigation clarified that Al 2 Ca and MgO were synthesized by employing Mg–Al alloy, not pure Mg as the matrix material. Microstructural analysis indicated that needle-like intermetallic of (Mg,Al) 2 Ca or Al 3 Ca 4 Mg were formed as intermediately created compounds in the solid-state reaction between CaO particles and Mg–Al alloy to synthesize Al 2 Ca and MgO dispersoids. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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