e/R-Phase

Information
has gloss	eng: The R-Phase is a phase found in Nitinol. It is a martensitic phase in nature, but is not "the" martensite that is responsible for the shape memory and superelastic effect. When one uses the word martensite in connection with Nitinol, one is invariably referring to the B19' monoclinic martensite phase, not the R-phase. The R-phase competes with martensite, often completely absent, and often appearing during cooling before martensite then giving way to martensite upon further cooling. Similarly, it can be observed during heating prior to reversion to austenite, or may be completely absent. The R-phase to austenite transformation (A-R) is reversible, with a very small hysteresis (typically 2-5 degrees C). It also exhibits a very small shape memory effect, and within a very narrow temperature range, superelasticity. The R-phase transformation (from austenite) occurs between 20 and 40 degrees C in most binary Nitinol alloys.
lexicalization	eng: R-Phase
instance of	c/Nickel alloys