Influence of T6 heat treatment on A356 and A380 aluminium alloys manufactured by thixoforging combined with low superheat casting
| Autor: | Kerem Altug Guler, Alptekin Kisasoz, Serhat Acar, Ahmet Karaaslan, Ridvan Gecu |
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| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Equiaxed crystals Materials science Scanning electron microscope Metallurgy Metals and Alloys chemistry.chemical_element 02 engineering and technology Liquidus 021001 nanoscience & nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Microstructure 01 natural sciences Casting law.invention Brinell scale chemistry Optical microscope Aluminium law 0103 physical sciences Materials Chemistry 0210 nano-technology |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 28:385-392 |
| ISSN: | 1003-6326 |
| Popis: | The effects of T6 heat treatment on thixoforged A356 and A380 aluminium alloys were studied. Low superheat casting (LSC) technique was carried out to prepare proper specimens for thixoforging process. The samples were poured at 20 °C above their liquidus temperatures which provided the formation of equiaxed grains instead of dendritic growth. Produced billets were reheated for varied time from 20 to 80 min and thixoforged with 50% deformation rate. After thixoforging process, the samples were T6 heat treated for both A356 and A380 alloys. The microstructural evaluation and hardness alteration of thixoforged, solution treated and aged specimens were examined comparatively by using optical microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy and Brinell hardness equipment. T6 heat treatment provided relatively uniform microstructure with newly formed precipitates that are Mg2Si and Al2Cu for A356 and A380 billets, respectively. Accordingly, hardness after artificial aging was increased considerably and reached HB 93 for A356 and HB 120 for A380 alloys. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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