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Nickel titanium, also known as nitinol, is a metal alloy of nickel and titanium, where the two elements are present in roughly equal atomic percentages. Different alloys are named according to the weight percentage of nickel; e.g., nitinol 55 and nitinol 60 .
Frost diagram of various Ti alloys Microstructure of a part made from Titanium alloy TITANIUM-ALLOY CONSTITUTION Phase DIAGRAM - Alpha Peritectoid TITANIUM-ALLOY CONSTITUTION Phase DIAGRAM - Beta Eutectoid TITANIUM-ALLOY CONSTITUTION Phase DIAGRAM - Beta Isomorphous. Titanium alloys are generally classified into four main categories, [1] [2] [3 ...
A binary phase diagram showing the most stable chemical compounds of titanium and nickel at different mixing ratios and temperatures. Phase transitions involving solutions and mixtures are more complicated than transitions involving a single compound.
Gamma prime (γ'): This phase constitutes the precipitate used to strengthen the alloy. It is an intermetallic phase based on Ni 3 (Ti,Al) which have an ordered FCC L1 2 structure. [10] The γ' phase is coherent with the matrix of the superalloy having a lattice parameter that varies by around 0.5%.
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In each of the three classes of Laves phase, if the two types of atoms were perfect spheres with a size ratio of /, [2] the structure would be topologically tetrahedrally close-packed. [3] At this size ratio, the structure has an overall packing volume density of 0.710. [ 4 ]
[20] and are phase rich in nickel, titanium, and silicon, [20] but chromium and manganese may substitute titanium sites. [34] G-phase precipitates occur during long-term aging, are encouraged by increasing nickel content in the ferrite phase, [34] and reduce corrosion resistance significantly. [35]
Phase diagram explaining how the pattern forms. First meteoric iron is exclusively composed of taenite. When cooling off it passes a phase boundary where kamacite is exsolved from taenite. Meteoric iron with less than about 6% nickel (hexahedrite) is completely changed to kamacite. Widmanstätten pattern, metallographic polished section