Characterization of a CuAlBe Alloy with Different Cr Contents

Candido, Gemierson Valois da Mota; Melo, Tadeu Antonio de Azevedo; Albuquerque, Victor Hugo C. de; Gomes, Rodinei Medeiros; Lima, Severino Jackson Guedes de; Tavares, João Manuel R. S.

doi:10.1007/s11665-012-0159-6

Cited by 18 publications

(5 citation statements)

References 18 publications

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“…al. 18 , promotes a significant change in the phase transformation temperatures of CuAlBe alloys. The authors associated an gradual increase of the transformation temperatures to the formation of precipitates containing Cr and Be and the subsequent reduction of the content of Be in the matrix.…”

Section: Resultsmentioning

confidence: 99%

Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys

et al. 2019

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The understanding of the stabilization mechanism of martensite used to obtain alloys with high hysteresis and the possibility of recovering this martensite (residual strain) by heating at temperatures higher than A s and A f have been fundamental for application in bonding devices. One of the possibilities to enhance residual strain is through mechanical cycling. This work evaluated the influence of number of cycles and the effect of precipitation of Nb-rich particles as mechanisms to increase residual strain in superelastic Cu-Al-Be-Nb alloys. The results showed that the presence of Nb-rich precipitates was not a predominant factor for the enhancement of residual strain. In addition, mechanical cycling has proved to be an efficient mechanism for raising residual strain, and consequently increasing the amount of martensite retained. However, the gain of residual strain is accompanied by an increase of plastic deformation.

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Section: Resultsmentioning

confidence: 99%

Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys

et al. 2019

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“…Melo et al [110,111] produced Cu-Al-Be SMA with additions of Ni and Nb and observed a large reduction in grain size, as well as an increase in mechanical strength and ductility. Candido et al [112] studied the addition of Cr in the Cu-Al-Be system and also observed a marked reduction in grain size. Additions of 0.2 wt% Cr led to higher mechanical strengths and to lower martensitic transformation temperatures, allowing the application of these alloys at even lower temperatures Rare earth elements such as gadolinium have also been added to these SMA at low levels between 0.05 and 0.15 wt%.…”

Section: Invited Feature Paper-reviewmentioning

confidence: 98%

Revisiting Cu-based shape memory alloys: Recent developments and new perspectives

Mazzer

Silva

Gargarella

2022

Journal of Materials Research

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Cu-based shape memory alloys belong to one important class of functional alloys, presenting shape memory effect and superelasticity due to their reversible martensitic transformation. Although they have been extensively studied since the middle of the last century, there are still many challenges to be solved. In the last decades, these alloys were extensively studied regarding new compositions, processing routes, phase transformation, mechanical and functional properties. Aspects of the thermoelastic phase transformation have been described using thermodynamic and thermo-mechanical studies, while the role of metallurgical features (such as grain size and morphology, ordering, precipitates and second phases) have been described mainly by phenomenological approach. In this sense this review discusses the advances in the general fundamentals of Cu-based shape memory alloys, the recent developments in processing routes, compositions, and applications in the last years. Graphical abstract

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“…However, the alloys Zr 4 and Zr 5 fail at lower stresses, and correspondingly the density of dimples decreased as shown in figures 7(d) and (e). This is due to increased average grain size and agglomeration of precipitates [24,29], which leads to a high-stress concentration at the GBs [19,46]. An increased size and volume fraction of Al 3 Zr precipitates by agglomeration create secondary micro-cracks on the bottom of the dimples encircled in figures 7(d) and (e).…”

Section: Tensile Properties and Fracture Morphologymentioning

confidence: 98%

“…Based on the literature, it is observed that the addition of less-soluble elements viz., grain refiners (Zr, Ti, Cr, V and B) in Cu-Al-based SMAs reduces the grain size and also inhibits intergranular-brittle fracture, in turn, remarkable enhancement in the mechanical properties [18][19][20][21][22]. Among these, Zr acts as a very good grain refiner as well as grain growth rates are suppressed effectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the pseudoelastic behavior on zirconium modified Cu–Al–Be shape memory alloys for seismic applications

Kalinga¹,

SM²,

Kattimani³

2022

Smart Mater. Struct.

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This paper examines the effect of 0.05-0.3 wt.% of zirconium-doping on microstructure, transformation temperatures, tensile properties, and pseudoelastic behavior of the parent β1-phase Cu87.93-Al11.5-Be0.57 shape memory alloys (SMAs). Results reveal that alloying zirconium in the evaluated SMA samples exhibits an excellent grain refinement up to 0.15 wt.%. Further, higher additions of Zr ≥ 0.2 wt.% lowers the grain refinement efficiency due to precipitates agglomeration. Larger the size and volume fraction of Al3Zr precipitates led to higher transformation temperatures. Tensile properties were improved with Zr-doping, resulting enhancements in the maximum tensile strength and ductility with the addition of 0.15 wt.% Zr. The alloy with 0.05 wt.% of Zr-dope showed a good pseudoelastic strain recovery of deformation strain and then lowered by retaining large residual strain, indicating deterioration in the pseudoelasticity of SMAs.

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Characterization of a CuAlBe Alloy with Different Cr Contents

Cited by 18 publications

References 18 publications

Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys

Influence of Mechanical Cycling on Residual Strain in Superelastic Cu-Al-Be-Nb Alloys

Revisiting Cu-based shape memory alloys: Recent developments and new perspectives

Experimental investigation of the pseudoelastic behavior on zirconium modified Cu–Al–Be shape memory alloys for seismic applications

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