Two-Way Shape Memory Effect Induced by Bending Deformation in Ductile Cu-Al-Mn Alloys

Omori, Toshihiro; Wang, Jijie; Sutou, Yuji; Kainuma, Ryosuke; Ishida, K.

doi:10.2320/matertrans.43.1676

Cited by 29 publications

(19 citation statements)

References 16 publications

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“…d'=dT, is about 2.1 in the same Cu-Al-Mn polycrystalline alloy. 11,12) Therefore, the martensitic transformation temperatures determined by DMS are expected to rise by about 10 C. In the present paper, DMS curves only during the heating process are presented, because the cooling curves show tendencies similar to those of the corresponding heating as demonstrated in Fig. 1.…”

Section: Methodsmentioning

confidence: 91%

Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

et al. 2005

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The damping property tan 0 of Cu-Al-Mn-based alloys, where tan 0 is nearly equal to internal friction Q À1 , was investigated using a Dynamic Mechanical Spectrometer (DMS). It was found that the dependences of frequency and strain amplitude on tan 0 are significantly different between the parent + martensite two-phase and the martensite single-phase states, i.e., tan 0 is mainly influenced by frequency in the two-phase state and by strain amplitude in the martensite state. It was also found that the relative grain size d=D is a function of the damping capacity, where d and D are the grain diameter and the diameter of the wire, respectively, and that tan 0 increases with increasing d=D. The maximum values of tan 0 ¼ 0:54 and tan 0 ¼ 0:07 were obtained in the two-phase state and in the martensite state, respectively, in the specimen of d=D % 1.

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Section: Methodsmentioning

confidence: 91%

Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

et al. 2005

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“…The reason for this difference is not clear, but a similar tendency was observed for the TWM effect induced by bending deformation in the Cu-Al-Mn alloy sheets. 13 The LTE temperature intervals (∆T LTE ), defined as the temperature region where the absolute value of the coefficient of thermal expansion is lower than 3 ϫ 10 Ϫ6 /K, are about 130°C and 150°C for the specimens with mean grain diameters ofd ϭ 0.61 mm and 1.51 mm, respectively ( Fig. 2a and b).…”

Section: Effects Of Grain Size and Specimen Thicknessmentioning

confidence: 99%

“…It is known that the grain refinement, however, causes a decrease of the SM and TWM effects. [10][11][12][13] Figure 2 shows the thermal expansion curves in RD with different reductions of cold rolling for the Cu-22.3Zn-10.6Al (at.%) β single-phase specimens (S alloy in Table I) with different mean grain diameters ofd ϭ 0.61 mm andd ϭ 1.51 mm. It is shown that the transition temperature intervals, i.e., M s Ϫ M f and A f Ϫ A s , increase with increasing reduction ratio, where M s , M f , A s , and A f are defined as temperatures that show minimum curvature in the cooling and heating curves as demonstrated in Fig.…”

Section: Effects Of Grain Size and Specimen Thicknessmentioning

confidence: 99%

Microstructure and thermal expansion properties of invar-type Cu-Zn-Al shape memory alloys

Wang

Omori

Sutou

et al. 2004

Journal of Elec Materi

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The effects of grain size, volume fraction of the α (fcc) phase in the β (bcc) matrix, and thermal stability on low thermal expansion (LTE) properties of Cu-Zn-Al shape memory (SM) alloys induced by cold rolling were investigated by dilatometry, optical microscopy, differential scanning calorimetry, and electrical conductivity measurements. The alloys with the larger grains showed a superior two-way memory (TWM) effect, wider LTE temperature intervals with excellent thermal stability under 80°C. The α ϩ β two-phase alloys also exhibited a good combination of cold workability and LTE properties. These results suggest that the Cu-Zn-Al alloys with high electrical conductivity of about 20% International Annealed Copper Standard (%IACS) have high potential as a new class of Invar alloys that can be applied in various fields.

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“…The two-way shape memory effect (TWSME) associated with the forward and reverse transformations of martensite is a phenomenon in which the reversible and spontaneous shape change during heating and cooling occur without any external stress [1]. The TWSME not only relates to the behavior of martensite transformation in shape memory alloys (SMAs), but also depends on training methods such as superelastic (SE) or shape memory effect (SME) training, thermomechanical training, aging under external stress, etc.…”

Section: Introductionmentioning

confidence: 99%

Two-Way Shape Memory Effect Induced by Tensile Deformation in Columnar-Grained Cu71.7Al18.1Mn10.2 Alloy

Yao

Huang

et al. 2018

Materials

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Columnar-grained Cu71.7Al18.1Mn10.2 shape memory alloy (SMA) was prepared by a directional solidification method and exhibited a high superelasticity of 8.18% and excellent ductility at room temperature, which provided the possibility of obtaining high shape memory. However, proper pre-deformation is an essential part of repeatedly obtaining large and stable shape change. In this paper, one-time uniaxial tensile pre-deformation was carried out at the temperature range −70–−80 °C. Then, the two-way shape memory effect (TWSME) of the alloy was evaluated by the martensitic transformation strain (εM) which was measured by a thermal expansion test to investigate the relationship between the pre-deformation strain (εT) and the TWSME. The results showed that εM of the columnar-grained Cu71.7Al18.1Mn10.2 alloy increased at first and then decreased with the increase of εT. The maximum value 2.91% of the εM could be reached when εT was 6%. The effects of the εT on transformation temperatures were also measured by differential scanning calorimetry. Based on the variations of transformation temperatures, the relationship between the internal stress induced by the pre-deformation process and the εM, and the influence mechanism of the pre-deformation strain on the TWSME in columnar-grained Cu71.7Al18.1Mn10.2 alloy, were discussed. The results obtained from this work may provide reference for potential applications of Cu-based SMAs, such as self-control components, fasteners, etc.

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Two-Way Shape Memory Effect Induced by Bending Deformation in Ductile Cu-Al-Mn Alloys

Cited by 29 publications

References 16 publications

Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

Damping Properties of Ductile Cu-Al-Mn-Based Shape Memory Alloys

Microstructure and thermal expansion properties of invar-type Cu-Zn-Al shape memory alloys

Two-Way Shape Memory Effect Induced by Tensile Deformation in Columnar-Grained Cu71.7Al18.1Mn10.2 Alloy

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