THERMAL FATIGUE OF SELECTED (Al-Ni) ALLOYS

Mohamed M.  Milad

doi:10.66411/jer.v17i.249

Authors

Mohamed M. Milad Materials and Metallurgical Engineering Department Faculty of Engineering, University of Tripoli, Libya Author

DOI:

https://doi.org/10.66411/jer.v17i.249

Keywords:

Advanced Materials, Intermetallic Compounds, Thermal Fatigue, Al-Ni alloys

Abstract

Thermal fatigue tests have been conducted on five aluminium-nickel alloys containing 14, 28, 36, 44 and 52 weight % nickel. The specimens in a prismatic shape were heated by an oxy-acetylene flame to the test temperature followed by rapid air- cooling. The maximum test temperatures were 350, 450 and 550oC and the number of cycles required to initiate a crack was taken as a measure of thermal fatigue resistance. Test results showed that the number of cycles to failure depends primarily on temperature and alloy composition. It is concluded that increasing the test temperature significantly reduced cycles to failure. As for composition, most alloys of higher percentages of Al3Ni aluminide showed less resistance to thermal fatigue. On the other hand, alloys containing Al3Ni2 aluminide, even in a small percentage, exhibited better resistance to fatigue failure.

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