Phase transformations during continuous cooling of polycrystalline β-CuAlBe alloys

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.…”

“…g 2 is the high aluminum stable phase, a complex cubic structure with stoichiometry Cu 9 Al 4 , coherent with the b matrix [2,3]. It has been recently shown that these alloys, with 23 at% Al, show a hypereutectoid behavior for Be content higher than around 2.9 at%, with g 2 as the first formed phase under slow cooling from high temperature [4]. Their influence on the MT in Cu-based SMA has been extensively studied, mostly in Cu-Zn-Al [5][6][7][8][9], and Cu-Al-Ni alloys [10][11][12].…”

“…A detailed description is given in Ref. [4]. The temperature was monitored using a chromel-alumel thermocouple spot welded to the sample.…”

Effect of Aging on Corrosion Behavior of Martensite Phase in Cu-Al-Be Shape Memory Alloy

“…The application of these alloy used as absorb vibration damping effect in bridge and building structure [7]. Heat treatment of this alloy like quenching from high temperature and then aging at different temperatures and time led to formation of different phases, and their Presence can affect their shape memory effect and corrosion behavior [8][9][10]. In realistic applications, as the alloy is exposure to corrosion solution for a period of time they are exhibit to corrosion and pitting, for that reason study of corrosion behavior like corrosion current and potential and pitting potential of the alloys are require to be done before they are put into biomedical and industrial applications.…”

Kinetics of isothermal decomposition in polycrystalline β CuAlBe alloys

“…The b phase (disordered bcc) is stable at temperatures higher than 850 K for the eutectoid composition containing approximately 23 at% Al and 3 at% Be [2]. It can be retained at room temperature (RT) by means of suitable cooling, suffering an ordering reaction to a DO 3 structure at temperatures close to 800 K. Under slow cooling rates, below around 100 K/min, the metastable b phase decomposes into the phases a (fcc structure) and g 2 (Cu 9 Al 4 structure), with low and high Al content, respectively [1,2]. Some studies on the Cu-Al b phase decomposition have been reported [3,4].…”