Study on Basic Characteristics of CuAlBe Shape Memory Alloy

Shape memory alloys with two different weight percentages of CuAlBe were irradiated with a 40 kGy constant gamma radiation dose, and the resulting thermal and structural changes in the alloys were examined. Changes in enthalpy and in the transformation temperature of the alloys were determined by differential scanning calorimetry (DSC), and thermodynamic parameters of alloy samples were calculated. Microstructural changes were determined by X-ray analysis. Microstructural changes were verified by metallographic observations, and microhardness measurements were taken. The study investigated to what extent the physical parameters of CuAlBe shape memory alloys changed depending on the alloying elements when subjected to a constant irradiation dose.

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“…The crystallite size for the alloy samples were calculated using the Debye Scherrer equation [31][32][33]:…”

Section: X-ray Diffraction (Xrd) Resultsmentioning

confidence: 99%

Effect on Thermal and Structural Properties of Element Content in CuAlBe Shape Memory Alloys Irradiated with a Constant Gamma Radiation Dose

Balo

ORHAN²

2023

Turkish Journal of Science and Technology

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“…Beryllium is an alloying element that positively and spectacularly changes the physicomechanical properties, resistance to cavitation corrosion, refractoriness, and operational reliability of Al bronzes. It also adds antimagnetic and anti-sparking properties to bronzes containing Al [8].…”

Section: Experimental Materialsmentioning

confidence: 99%

“…Beryllium is an alloying element that positively and spectacularly changes the physico-mechanical properties, resistance to cavitation corrosion, refractoriness, and operational reliability of Al bronzes. It also adds antimagnetic and anti-sparking properties to bronzes containing Al [8]. Microstructural analysis was performed using a Zeiss optical microscope (Zeiss, Jena, Germany) with a MotiCam optical camera at room temperature (≈25 °C).…”

Section: Experimental Materialsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…But, Cu-based SMAs have some drawbacks that are tried to be improved such as thermal instabilities, martensite stabilization and brittle nature and weak mechanical properties (low cold workability) stemmed from mainly their microstructural properties such as the large grain sizes, accumulation of secondary phases or impurities along the grain boundaries, high degree of order and also high elastic anisotropy in the β-phase [7,[23][24][25]. A common and simple way to modify microstructure and reduce the grain size for improving these drawbacks and also to change characteristic martensitic transformation temperatures, SME, SE or other properties is to add some ternary, quaternary or more extra additive elements such as Ti, V, Co, Mn, Zr, Ce, Fe, Ni, B, Be, Mg, Sn or C [7,18,19,[22][23][24][26][27][28][29][30][31][32][33][34][35]. SMAs are ultra sensitive to the compositional changes, their properties can change dramatically by even very little changes in the alloying composition.…”

mentioning

confidence: 99%

Novel Quaternary CuAlZnMg High Temperature Shape Memory Alloy (HTSMA) Fabricated by Minor Batch of Zn and Mg Additions

BAŞBAĞ

Karaduman

Özkul

et al. 2023

Turkish Journal of Science and Technology

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Shape memory alloys (SMAs) constitute the second largest commercial smart material class after piezoelectric materials. Different SMA alloy systems or SMAs with miscellaneous functionalities and characteristic properties have been designed for using in different applications until today. High temperature shape memory alloys (HTSMAs) are also widely desired to be used in various smart materials applications. HTSMAs with different functional and characteristic properties are muchly demanded for different tasks to be done by these alloys or devices designed by these alloys. A common and practical way to fabricate SMAs or HTSMAs with different shape memory effect (SME) and other properties is to fabricate them with different alloying compositions and add different additive elements. In this work, a quaternary CuAlZnMg HTSMA with an unprecedented composition consisting minor amount of zinc and magnesium additives was produced by arc melting method. As a result of applying post-homogenization in high β–phase temperature region and immediate quenching, the microstructural mechanism of a SME property was formed in the produced alloy. After then, to examine SME characteristics of the CuAlZnMg alloy some differential thermal analysis (DTA), microstructural (XRD) and magnetization (VSM) characterization tests were carried out. The DTA results showed that the alloy is a HTSMA exhibiting reverse martensitic transformations at temperature range between 167 °C and 489 °C. The XRD pattern obtained at room temperature revealed the martensite phases formed in the alloy, which phases are the base mechanism of the reversible martensitic transformation (the SME property) of the alloy. The VSM test showed the paramagnetic nature of the alloy.

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Study on Basic Characteristics of CuAlBe Shape Memory Alloy

Cited by 10 publications

References 26 publications

Effect on Thermal and Structural Properties of Element Content in CuAlBe Shape Memory Alloys Irradiated with a Constant Gamma Radiation Dose

Effect on Thermal and Structural Properties of Element Content in CuAlBe Shape Memory Alloys Irradiated with a Constant Gamma Radiation Dose

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

Novel Quaternary CuAlZnMg High Temperature Shape Memory Alloy (HTSMA) Fabricated by Minor Batch of Zn and Mg Additions

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