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Depth Sensing Indentation Analyses of Hypereutectic Al-10Ni – XSc (X = 0, 1, 2) Alloys
M. Fatih Kilicaslan,Ercan Karakose 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.3
Depth sensing indentation analyses of hypereutectic Al-10Ni alloys with different amounts of Sc content wereperformed to determine the values of elastic modulus, dynamic microhardness, creep rate and elastic recoveryrate. Microstructural characterizations were performed by using scanning electron microscopy (SEM), SEMmapping and an X-ray diffractometer. The results revealed that the addition of Sc refined the intermetallic phasesof Al and Ni, and led to the formation of two additional intermetallic phases as well, namely Al3Sc andmetastable Al9Ni2. The Al-Ni alloys investigated in this work exhibited elastoplastic behavior at room temperatureand the addition of Sc influences their elastic-plastic responses to the indentation process. In addition,dynamic microhardness of them exhibited a load-dependent character called the indentation size effect. Theaddition of Sc considerably improved the values of dynamic microharddness, elastic modulus and elasticrecovery rate. It also resulted in a lower creep displacement rate.