Abstract
Al7Si0.5Cu0.3Mg(0.3-1)Ni alloys were investigated for elevated temperature performance. It was found that while the yield strength of the overaged alloys at 300°C increased with Ni, the creep resistance decreased. Microstructural observations revealed that the brittle interdendritic Τ-Al9FeNi intermetallics undergo severe cracking in the early stages of creep deformation, which weakens the interdendritic regions and leads to a decrease in creep resistance. This study shows that Mn additions modify the Τ-phase preventing cracking during creep and increase the creep resistance.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 248-256 |
| Number of pages | 9 |
| Journal | Materials Science and Engineering: A |
| Volume | 582 |
| DOIs | |
| State | Published - Oct 2013 |
Funding
This work was supported by the NSERC (Natural Sciences and Engineering Research Council) of Canada Strategic project grant with Rio Tinto Alcan (RTA). The authors thank Pierre Vermette of McGill University for his assistance in experimental work. Amir Rezaei Farkoosh would like to gratefully acknowledge the financial support of McGill University through MEDA (McGill Engineering Doctoral Award) program . A part of the research presented in this paper was financed by the Fonds québécois de la recherche sur la nature et les technologies by the intermediary of the Aluminium Research Centre—REGAL . In addition, we are grateful for the help and assistance of Prof. H. Vali and Dr. Xue-Dong Liu (TEM).
Keywords
- Aluminum alloys
- Aluminum engine alloys
- Casting
- Creep properties
- Nickel addition
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering