Effects of grain size on plastic deformation in a β CuAlBe shape memory alloy

Montecinos, S.; Cuniberti, A.

doi:10.1016/j.msea.2014.02.028

Cited by 13 publications

(7 citation statements)

References 24 publications

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“…This difference in induction stress is associated with the grain size of the samples. Montecinos and Cuniberti 22 verified an induction stress dependence on the grain size for Cu-Al-Be alloy and reported an increase in induction stress with decreasing grain size. Figure 7 shows the evolution of residual strain ( Figure 7a) and superelasticity ( Figure 7b) as a function of temperature for the 30% HR and 100% HR samples, both subjected to a maximum deformation of 5%.…”

Section: Resultsmentioning

confidence: 87%

Effect of Hot Rolling on the Thermomechanical properties of a Superelastic Cu-Al-Be-Cr Alloy

et al. 2020

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Shape memory alloys are generally produced by casting processes and are subsequently homogenized. However, to obtain semifinished products on an industrial scale, the ingots from the casting process must be hot worked. In particular, final bar and sheet products can be obtained by hot rolling process. During intense hot work, surface oxidation of the material and microstructural changes may cause modifications to its original thermomechanical properties. In this sense, the present work aimed to study the correlation of the superelastic behavior in a Cu-Al-Be-Cr alloy before and after subjecting it to the hot rolling thermomechanical process. Abnormal grain growth was observed for a hot rolled sample with 30% reduction in initial alloy thickness. This abnormal growth in relation to non-rolled alloy caused an increase in phase transformation temperatures, a reduction in residual strain, a reduction in induction stress and an increase in alloy superelasticity.

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Section: Resultsmentioning

confidence: 87%

Effect of Hot Rolling on the Thermomechanical properties of a Superelastic Cu-Al-Be-Cr Alloy

et al. 2020

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“…Then, our results give no evidence of grain stagnation due to texture changes as main mechanism. Moreover, the martensitic transformation characteristics, highly dependent on crystallographic orientation, do not reflect marked texture changes when measured as a function of grain size [10,21].…”

Section: Discussionmentioning

confidence: 92%

“…In CuAlBe and CuZnAl alloys, the largest transformation strain is obtained in well-oriented single [11,20]. We have performed detailed studies about the thermomechanical and pseudoelastic behavior product of the martensitic transformation induced by tensile and compressive tests of CuAlBe polycrystals [5,10,11,16,21]. The recoverable pseudoelastic strain increases and the stress hysteresis decreases as the grain size increases [16,21].…”

Section: Introductionmentioning

confidence: 99%

“…We have performed detailed studies about the thermomechanical and pseudoelastic behavior product of the martensitic transformation induced by tensile and compressive tests of CuAlBe polycrystals [5,10,11,16,21]. The recoverable pseudoelastic strain increases and the stress hysteresis decreases as the grain size increases [16,21]. High damping capacities with values near to those reported for NiTi alloys under similar conditions can be obtained [5].…”

Section: Introductionmentioning

confidence: 99%

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Grain size evolution in Cu-based shape memory alloys

et al. 2015

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A study of the grain growth kinetics in two shape memory alloys, CuAlBe and CuZnAl, is reported. Isothermal aging treatments at temperatures between 1023 and 1123 K were conducted, determining the grain size distribution as a function of time. The results show that the size distribution can be described by a log-normal type relationship, and is time-invariant. It was found that the arithmetic mean grain size almost coincide with the mode, which means that it is a representative parameter of the microstructure along the annealing time. The growth kinetics is strongly dependent on the aging temperature in CuZnAl, while is weakly in CuAlBe. It was verified that the grain size-time power law usually applied is not appropriate to describe the process, and an early departure from the ideal behavior is observed. The modification with a time-dependent dragging force gives a reasonable approximation to the grain growth kinetic. The obtained results are compared with the scarce data existing on this type of alloys.

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“…On removing the load, the retransformation of martensite to β phase occurs, and a hysteretic loop is formed. An almost complete strain recovery is expected up to ε ps around 3 % [20]. As σ max increases, the induced martensite cannot completely retransform to β phase.…”

Section: Figure 1 3 Results and Discussionmentioning

confidence: 96%

Corrosion behavior of a β CuAlBe shape memory alloy containing stress induced martensite

Montecinos

Klímek

Sláma

et al. 2019

Applied Surface Science

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The corrosion behavior of a β CuAlBe shape memory alloy containing stress-induced martensite was analyzed after 60 days of immersion in a 3.5 % NaCl solution. The stress-induced martensite was retained in the sample after a load-unload compression cycle up to a pseudoelastic deformation of 4.5 %. The corrosion of the alloy occurs by dealuminization, where β phase located in the areas between the needles of martensite is dissolved due to the preferential loss of aluminum, and the posterior redeposition of copper takes place.

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Effects of grain size on plastic deformation in a β CuAlBe shape memory alloy

Cited by 13 publications

References 24 publications

Effect of Hot Rolling on the Thermomechanical properties of a Superelastic Cu-Al-Be-Cr Alloy

Effect of Hot Rolling on the Thermomechanical properties of a Superelastic Cu-Al-Be-Cr Alloy

Grain size evolution in Cu-based shape memory alloys

Corrosion behavior of a β CuAlBe shape memory alloy containing stress induced martensite

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