Influence of Be addition on order–disorder transformations in β Cu–Al

Effect of γ2-phase precipitates on the martensitic transformation of a β-CuAlBe shape memory alloy

“…A single ordering transition in the Cu-Al-Be b phase, from a A2 to a DO 3 structure, occurs under cooling at around 800 K for low Be content and compositions near the eutectoid, with no significant dependence on Be content [13,14] The precipitation of g 2 phase leads to a decrease of the ordering temperature, being around 770 K for the maximum g 2 volume fraction [4]. with the martensitic transformation which progresses with an almost constant stress-strain slope.…”

Kinetics of isothermal decomposition in polycrystalline β CuAlBe alloys

“…The precipitates grow mostly by a diffusive mechanism and the dendrite arms follow well-defined directions as a consequence of the strong dependence of interfacial energy with the crystalline orientation. In a previous work for the studied For temperatures lower than 800 K, b phase has an ordered DO 3 structure [2,13]. During isothermal treatments between 670 K and 760 K, the sequence of precipitation is b / a 0 / eutectoid (a' þ g 2 ).…”

Phase Equilibria in Binary and Ternary Systems with Chemical and Magnetic Ordering

“…Its first-order nature was also proven by electrical resistivity measurements in the ternary alloys. [33] Jurado et al [30] called this transformation ''a unique disorder-order transition''. Moreover, they confirmed its existence in binary Al-Cu alloys in the vicinity of the Cu 3 Al stoichiometric composition.…”