Peculiarities of forming diffusion bimetallic joints of aluminum foam with a monolithic magnesium alloy
| Autor: | M.A. Khokhlov, J.A. Khokhlova, D. Ishchenko |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
lcsh:TN1-997
0209 industrial biotechnology Materials science chemistry.chemical_element 02 engineering and technology Welding Metal foam 01 natural sciences law.invention Diffusion Vacuum furnace 020901 industrial engineering & automation law Indentation 0103 physical sciences Gallium Magnesium alloy Crystallization lcsh:Mining engineering. Metallurgy 010302 applied physics Bimetallic Metallurgy Metals and Alloys Microstructure Aluminum foam chemistry Mechanics of Materials |
| Zdroj: | Journal of Magnesium and Alloys, Vol 4, Iss 4, Pp 326-329 (2016) |
| ISSN: | 2213-9567 |
| DOI: | 10.1016/j.jma.2016.11.001 |
| Popis: | The work is carried out to determine an optimal method to obtain the welded bimetallic joints of monolithic Mg-alloy with porous Al-alloy using gallium as chemical activator and heating up to 300 °C by two different methods: long-term in vacuum oven and short-term without vacuum by passing of low voltage current. There is no microstructure change in Al-foam but indentation test records the negligible reduction of the mechanical properties. SEM showed the crystallization of two types of Mg 5 Ga 2 and Mg 2 Ga inter-metallic phases in the wavy uneven diffusion zone on Mg-alloy side with significant increase of micro-hardness and Young's modulus. The narrow depth of the diffusion zone takes place in joints by short-term heating, so this method is more applicable for welding of monolithic and porous alloys at chemical activation using gallium. |
| Databáze: | OpenAIRE |
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