Tensile characteristics and shape memory effect of Ni56Mn21Co4Ga19 high-temperature shape memory alloy

Ma, Yonghong; Yang, Shuiyuan; Wang, Cuiping; Liu, Xingjun

doi:10.1016/j.scriptamat.2008.01.013

Cited by 18 publications

(9 citation statements)

References 18 publications

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“…There are three stages appearing in the σ-ε curves, similar to the typical tensile stress-strain curve of Ni-Ti SMAs [18]. During loading, the region from A to B in figure 2(c In figure 2(b), the superelastic strain value of ~11.5% and tensile elongation as high as 14% with full recovery, is much higher when compared to superelastic strain values of polycrystalline Ni-Al alloy (~10%) and Ni-Mn alloy (~11%), as well as hightemperature SMAs with partial recovery (~8%) [4,17], oligocrystalline Ni-Mn-Ga microwires with a maximum recoverable strain of 3.5% [20], and Cu-Zn-Al oligo-crystalline shape memory microwires with a reversible strain of 6% [21].…”

Section: Resultsmentioning

confidence: 97%

14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

Ding

Zhu

Zhang

et al. 2017

J. Phys. D: Appl. Phys.

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Shape memory alloys exhibit superelasticity and shape memory properties by virtue of a reversible phase transformation between austenite and martensite. Here, 14% recoverable strain is reported in a Heusler-type Ni52.87Mn23.82Ga23.32 microwire, fabricated by rapid solidification via the Taylor method, with a diameter of 110 µm. The microwire exhibits superelastic strain of ~11%, very low Young’s modulus of ~5.5 GPa, critical stress of ~110 MPa and mechanical stability during cyclic tensile test. We attribute this enhanced ductility and large superelasticity to the stress-induced martensitic phase transformation. The energy conversion and the structure of martensitic phase induced by stress are also discussed.

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Section: Resultsmentioning

confidence: 97%

14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

Ding

Zhu

Zhang

et al. 2017

J. Phys. D: Appl. Phys.

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“…This increment in shape recovery is related to the enhancement of the yield strength of this alloy after being aged. The yield strength is associated with the reorientation of martensitic variants and/or detwinning [35]. On the other hand, the formation of (Ni 3 (Al, Ti), Ti 3 Á3Al, and Ni 0.35 Al 0.3 Ti 0.35 ) precipitates, along with increased volume fraction and the needle-like size of the b 0 1 phase, can effectively hinder plastic deformation and increase strength, thus increasing SME.…”

Section: Tensile Testsmentioning

confidence: 99%

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

Saud

Hamzah

Abubakar

et al. 2015

J Therm Anal Calorim

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The present work aims to investigate the aging treatment effects on the microstructure, transition characteristics, and mechanical properties of Cu-Al-Ni-xTi shape memory alloys. The aging treatment of the homogenized and modified alloys of Cu-Al-Ni-xTi results in variations of the martensite morphology, volume fraction, and precipitate size. These variations in the features of precipitates have an obvious effect on transition behavior and mechanical properties. The transition temperatures are increased slightly with an increase in the aging time and temperatures; such increase is mainly attributed to changes in the c 0 1 and b 0 1 morphology and distribution, along with the precipitates. The thermodynamic parameters (DH and DS) tend to decrease with an increase in the aging time and temperatures. Moreover, the brittleness, low strength, and poor processability of Cu-Al-Ni alloys greatly limit their application. We attempted to improve the mechanical properties without losing the thermoelastic properties through the additions of Ti and appropriate aging treatments. The highest tensile strength and strain of 640 MPa and 4.3 % were obtained in alloy of Cu-Al-Ni-0.7 mass% Ti aged at 250°C for 24 h and 100°C for 48 h, respectively. The shape memory behavior of the alloys was studied using a specially designed machine. The strain recovery by shape memory effect of the alloys increases with an increase in the aging tomes and temperature, where the highest recovery (100 %) is obtained with the alloy of Cu-Al-Ni-0.7 mass% Ti after being aged at 250°C for 24 h.

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“…This implies that the γ phase spacing needs to be reduced to limit the space for crack propagation in the brittle Heusler phase. Second, the shape memory ability is often compromised by the presence of the γ phase [31,32]. The γ phase exhibits no martensitic transformation and deforms via dislocation slip [33], thus acts as a pure mechanical resistance and weakens the alloy's ability for shape recovery.…”

Section: Introductionmentioning

confidence: 99%

A eutectic dual-phase design towards superior mechanical properties of heusler-type ferromagnetic shape memory alloys

Liang

Zhang

et al. 2019

Acta Materialia

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Heusler-type ferromagnetic shape memory alloys possess attractive multifunctional properties, including magnetic field induced shape memory effect, magnetoresistance and magnetocaloric effect, owing to the unique concurrent magnetic and martensitic transformations. However, these intermetallics generally exhibit intrinsic high brittleness and low strength, which severely impede their workability for processing and applicability in real use. In this study, we demonstrate a new grain refining strategy by means of eutectic solidification to improve the mechanical properties in Ni-Mn-Sn-Fe alloys. In a fully eutectic microstructure, the average γ lamellae thickness was refined to ~170 nm and the composite showed a compressive strength of 1950 MPa, ductility of 19.5%, Young's Modulus of 38 GPa, pseudoelasticity of 3.2% and high mechanical cyclic stability. The high mechanical performance is attributed to the effect of departmentalisation of the brittle Heusler alloy by the densely distributed γ phase fine lamellae in resisting crack propagation. The eutectic Heusler composite exhibited a metamagnetic phase transformation, with a magnetic entropy change of 10.2 J/kg•K and a refrigeration capacity of 181 J/kg in a field change of 5 T.

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Tensile characteristics and shape memory effect of Ni56Mn21Co4Ga19 high-temperature shape memory alloy

Cited by 18 publications

References 18 publications

14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

A eutectic dual-phase design towards superior mechanical properties of heusler-type ferromagnetic shape memory alloys

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Tensile characteristics and shape memory effect of Ni56Mn21Co4Ga19 high-temperature shape memory alloy

Cited by 18 publications

References 18 publications

14% recoverable strain in Ni52.87Mn23.82Ga23.32 microwires

14% recoverable strain in Ni52.87Mn23.82Ga23.32 microwires

X-phase precipitation in aging of Cu–Al–Ni–xTi shape memory alloys and its influence on phase transition behavior

A eutectic dual-phase design towards superior mechanical properties of heusler-type ferromagnetic shape memory alloys

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14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires

14% recoverable strain in Ni_52.87Mn_23.82Ga_23.32 microwires