Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2010 - zeszyt 3

Thermal stability of Ni3Al-based intermetallic alloys structure upon long-lasting annealing

nr katalogowy: 52760

Intermetallic alloys present a group of intensively investigated hightemperature structural materials. A lot of work has been focused on Ni3Al-based alloys. Due to large aluminium content and high degree of structure ordering, these alloys posses some advantages over actually applied nickel-based superalloys [1]: -- much better oxidation and carburization resistance at temperature up to 1100°C, -- good mechanical strength at high temperature (with effect of an anomalous temperature dependence of yield strength), -- excellent wear resistance, also at high temperature, -- relatively low density and costs of raw materials. However, the main drawback in wide commercialization of Ni3Al-based alloys (and other intermetallic-based materials) is their low fracture thouhgness and, related with that, problematic manufacturing and processing of these materials. The problem of Ni3Al-based alloys brittleness has already been prominently reduced by the modification of chemical composition (e.g. by alloying with small amounts of boron and zirconium [2, 3]) and development of effective manufacturing technologies [4], what has resulted in few successful industrial applications of these materials [5]. The current applications of Ni3Al-based casting alloys include, e.g. heat treating trays and fixtures for carburizing and air environments, transfer rolls for austenitizing furnaces, forging dies and special components. Additionally, Ni3Al-based alloys in the form of cold-rolled thin foils (with thickness even below 50 μm) are considered as promising substrate material for applications in microelectromechanical systems (MEMS). Ni3Al thin foils formed in so-called honey-comb structures can also be applied in electrochemical systems such as catalytic production of hydrogen from methanol system [6]. Neverthless, an quantitative description of relationship between structure and properties of Ni3Al-based alloys is rather difficult, due to their h[...]

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