TEM observation of extracted precipitates in T5 heat treated Al–Si–Mg alloy
The precipitation behavior of an Al–6.8 %Si–0.38 %Mg cast alloy subjected to T5 heat treatment was investigated using transmission electron microscopy (TEM). At the peak aging condition of 200 °C, granular and rod-shaped precipitates were observed at the center of the dendrite. Rod-shaped precipitat...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-12-01
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| Series: | Materials Letters: X |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2590150825000092 |
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| Summary: | The precipitation behavior of an Al–6.8 %Si–0.38 %Mg cast alloy subjected to T5 heat treatment was investigated using transmission electron microscopy (TEM). At the peak aging condition of 200 °C, granular and rod-shaped precipitates were observed at the center of the dendrite. Rod-shaped precipitates were successfully extracted after aging at 250 °C for 3.6 ks. Energy-dispersive X-ray spectroscopy (EDS) confirmed that the extracted precipitates had a Mg:Al:Si atomic ratio of approximately 1:4:5, consistent with previously reported Type-A precipitates. Selected area electron diffraction (SAED) analysis further confirmed their hexagonal crystal structure, with lattice parameters a = 0.405 nm and c = 0.67 nm. These findings indicate that Type-A precipitates, which are typically observed in excess-Si Al–Mg–Si alloys, also form in T5-treated Al–Si–Mg cast alloys. |
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| ISSN: | 2590-1508 |