Effects of hot rolling on the microstructure, thermal and mechanical properties of CuAlBeNbNi shape memory alloy

Pedrosa, Marcus T.M.A.; Silva, David D.S.; Brito, Ieverton Caiandre Andrade; Alves, Rosana Cardoso; Caluête, Rafael Evaristo; Gomes, Rodinei Medeiros; Oliveira, Danniel Ferreira de

doi:10.1016/j.tca.2022.179188

“…To calculate the impact energy, the digital system uses the following formula: E = m × g × h [J]; here, m is the falling mass [kg], g is gravitational acceleration [m/s2], and h is the falling height [m]. The weight shape is chosen according to the application of the material used in the construction of the equipment [13,14]. The impact tester uses a stand composed mainly of a table providing sufficient energy for the test; a digital system for determining drop height and calculating impact energy; the test sample; a rusted steel plate; an explosion chamber (the outer wall is open and covered with a plastic sheet to allow the release of the explosion pressure); a device allowing the longitudinal and transverse movement of the rusted plate; and explosive-mixturegenerating equipment consisting of a dosing installation and the oxygen analyzer.…”

Section: General Testing Proceduresmentioning

confidence: 99%

“…To calculate the impact energy, the digital system uses the following formula: E = m × g × h [J]; here, m is the falling mass [kg], g is gravitational acceleration [m/s 2 ], and h is the falling height [m]. The weight shape is chosen according to the application of the material used in the construction of the equipment [13,14].…”

Section: General Testing Proceduresmentioning

confidence: 99%

Analysis of Chemical, Microstructural and Mechanical Properties of a CuAlBe Material Regarding Its Role as a Non-Sparking Material

Chelariu,

Cimpoesu,

Jurca

et al. 2024

Materials

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We developed and analyzed a novel non-sparking material based on CuAlBe for applications in potentially explosive environments. Using a master alloy of CuBe, an established material for anti-sparking tools used in oil fields, mines, or areas with potentially explosive gas accumulations, and pure Al, we used an Ar atmosphere induction furnace to obtain an alloy with ~10 wt% Al and ~2 wt% Be percentages and good chemical and structural homogeneity. The new material was tested in an explosive gaseous mixture (10% H2 or 6.5% CH4) under extremely strong wear for 16,000 cycles, and no hot sparks capable of igniting the environment were produced. The material was used in the form of hot-rolled plates obtained from melted ingots. The experimental results reflect the use of a suitable material for non-sparking tools. This material has good deformability during hot rolling, abnormal grain growth during deformation under heat treatment and special thermo-mechanical processing, and no high chemical composition variation. Additionally, there are slightly different corrosion resistance and mechanical properties between the melt and hot-rolled state of CuAlBe material. Through hot rolling, the material’s corrosion resistance increased, reducing the chances of generating sparks capable of causing explosions.

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“…Nevertheless, these alloys come with drawbacks such as high cost and a challenging fabrication process [4]. In lieu of these alloys, there has been significant research on Cu-based shape memory alloys due to their cost-effectiveness and comparatively straightforward processing [5][6][7]. In addition to the conventional thermally induced shape memory effect ob-served in TiNi-based alloys, in 1996, Ullakko et al [8] reported a large magnetic field induced strain in Ni 2 MnGa single crystals.…”

Section: Introductionmentioning

confidence: 99%

Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

Martín-Olalla,

Vidal-Crespo,

Romero

et al. 2024

J Therm Anal Calorim

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We study the thermal properties of a bulk $$\hbox {Ni}_{55}\hbox {Fe}_{19}\hbox {Ga}_{26}$$ Ni 55 Fe 19 Ga 26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates ($$\sim {1}\,\hbox {K h}^{-1}$$ ∼ 1 K h - 1 ), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14 M modulated structure in the martensite phase. In ultraslow experiments ($${40}\,\hbox {mK h}^{-1}$$ 40 mK h - 1 ), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14 M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $$p(u)\propto u^{-\varepsilon }\exp (-u/\xi )$$ p ( u ) ∝ u - ε exp ( - u / ξ ) where $$\varepsilon \sim 2$$ ε ∼ 2 and damping energies $$\xi ={370}{\upmu {\rm J}}$$ ξ = 370 μ J (direct) and $$\xi ={27}{\upmu {\rm J}}$$ ξ = 27 μ J (reverse) that characterize the asymmetry of the transformation.

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“…Cu-Al-Be and Cu-Al-Mn SMAs were considered to be the closest replacement to Ni-Ti, which is due to their martensitic phase transition, low cost and relatively simple processing. They have also been extensively studied by researchers [6,7]. Existing research has shown that the Cu-Al-Ni alloys tend to be brittle [8,9].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and shape memory properties of Cu-Al-Fe alloys with different Al contents made by additive manufacturing technology

Wang

¹

,

Huang

²

,

Shen

³

et al. 2022

Mater. Res. Express

8

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The Al contents play an exceedingly important role in Cu-Al system shape memory alloys (SMAs), and Cu-Al-Fe alloy represents the new development directions of Cu-Al system SMAs. The Cu-xAl-4Fe (x=11, 13, 15 wt.%) alloys, which take the powder core wire with a structure resistant to element burning as additive manufacturing materials, were prepared by arc melt deposition process. In this work, the as-deposited, quenched and deformed microstructure was studied in detail by utilizing OM, SEM, and XRD. The shape memory properties of the alloys were analyzed by the bending tests. The effect mechanism of the Al content on the shape memory properties of Cu-Al-Fe alloys was also investigated. Results show that the as-deposited microstructure presents sub-eutectic to hyper-eutectic characteristics with the rise in Al content. After quenching, the microstructure of 11 wt.% Al, 13 wt.% Al, and 15 wt.% Al alloys are the α' martensite, the β1' martensite, and the β1 austenite with high order degrees. Under 4% pre-strain, the shape memory recovery rate of the 13 and 15 wt.% Al alloy is 100%, but the shape memory recovery rate of 11 wt.% Al alloy is only 22.6%. However, compared with the ductility of 11 and 13 wt.% Al alloy, that of 15 wt.% Al alloy is poor, which causes failure to withstand 4% bending pre-strain. After bending deformation, cracks of 15 wt.% Al alloy along the crystals appear and cause the memory strip to break. The analysis indicates that the properties of Cu-Al-Fe alloy have an intense sensitivity to the Al element. The martensitic order degree of the alloy is elevated with the increase in the Al content, and the grain interface gradually becomes sharper. Solidification impurities are formed at the grain boundary during the additive manufacturing process due to the influence of the interface energy. At the same time, the invading O2 combines with the more active Al element to form metal oxidation, which markedly reduces the grain boundary strength and the bending strength of the alloy. As a result, the shape memory properties cannot be reflected in the case of high Al content.

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Effects of hot rolling on the microstructure, thermal and mechanical properties of CuAlBeNbNi shape memory alloy

Cited by 14 publications

References 39 publications

Analysis of Chemical, Microstructural and Mechanical Properties of a CuAlBe Material Regarding Its Role as a Non-Sparking Material

Analysis of Chemical, Microstructural and Mechanical Properties of a CuAlBe Material Regarding Its Role as a Non-Sparking Material

Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena

Microstructure and shape memory properties of Cu-Al-Fe alloys with different Al contents made by additive manufacturing technology

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