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Although electrets are only in a metastable state, those fashioned from very low leakage materials can retain excess charge or polarization for many years.
en.wikipedia.org The quenching results in the formation of metastable martensite, the fraction of which is reduced to the desired amount during tempering.
en.wikipedia.org Thus, the application of large shear stresses during fracture nucleates the transformation of a zirconia inclusion from the metastable phase.
en.wikipedia.org Also, the use of a metastable polymorphic form of one cocrystal former can be employed.
en.wikipedia.org Upon final quenching a metastable austenite is retained in the predominately ferrite matrix along with small amounts of bainite (and other forms of decomposed austenite).
en.wikipedia.org