Transformational elasticity in a polycrystalline Cu-Zn-Sn alloy

Dvořák, Ivan; Hawbolt, E. B.

doi:10.1007/bf02673675

Cited by 71 publications

(32 citation statements)

References 5 publications

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“…The martensitic transformation temperatures are decreased by the additions of V and Cr. It has been reported that the martensitic transformation temperatures are a function of the grain size in the case of some ferrous systems [7,8] and some Cu-based alloys [9,10]. Figure 3 shows the variation of M s and A f temperatures with P grain size in the Cu-AlMn-V or -Cr alloys, in comparison with similar data from a Cu-Zn-Al-Zr alloy [10].…”

Section: -2 Martensitic Transformation Temperaturesmentioning

confidence: 63%

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

et al. 2001

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Abstract. The effect of grain refinement on the mechanical and shape memory (SM) properties of the p" phase CuAl-Mn alloys with L2, structure were investigated by optical microscopy, scanning electron microscopy, differential scanning calorimetry and tensile-testing. Additions of V or Cr to the Cu-AI-Mn ternary alloy in amounts over 0.5at.%V or lat.%Cr were effective in refining the p" phase grain sizes to less than 200um. The M s temperature decreased with increasing V or Cr content, obeying the Hall-Petch type relation with the p"-grain size. The mechanical properties were improved, but the SM and pseudoelastic properties were not improved by grain refinement.

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Section: -2 Martensitic Transformation Temperaturesmentioning

confidence: 63%

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

et al. 2001

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“…This drastic decrease might be related to the grain-size effect. With regard to the effect of grain size on the SM properties, as reported by Dvorak and Hawbolt, 17) large grain size results in a good SM effect. The -grain size of 28Al and 27Al is much larger than that of 26Al-23Al as shown in Table 1, and the grain structure of specimens 28Al and 27Al should be of a columnar type, because the grain size is several times larger than the thickness of specimen.…”

Section: Sm Propertiesmentioning

confidence: 69%

Ferromagnetic Co-Ni-Al Shape Memory Alloys with β+γ Two-Phase Structure

et al. 2004

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The effects of the introduction of the (A1) phase into the (B2) phase on the mechanical and shape memory properties in ferromagnetic Co-Ni-Al shape memory alloys with the þ two-phase structure were investigated by cold-rolling, tensile tests, and bending tests. The mechanical properties were found to be improved with an increase in the volume fraction of the phase, and Co-33 at%Ni-26 at%Al alloy with V ¼ 36% exhibited excellent cold workability with a critical reduction ratio of 40%. Although the degree of shape recovery decreases with an increase in the volume fraction of the phase, it can be enhanced by training. Since two-phase þ Co-Ni-Al alloys have several advantages such as cost efficiency and workability, this alloy system is considered as being a new type of ferromagnetic shape memory alloys (FSMAs).

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“…12) Very recently, the present authors have found that another relative grain size d/w normalized by the sheet width w should also be taken into account, and that the larger the d/t and d/w, the smaller the constrained stresses. 13) In the present study, d/w was used as a variable to express the relative grain size.…”

Section: Transformation Temperaturesmentioning

confidence: 70%

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

et al. 2002

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Martensitic transformation temperatures and the two-way shape memory effect (TWME) in ductile Cu-Al-Mn alloys deformed at room temperature were investigated using differential scanning calorimetry (DSC) and the bending test. The M s and A f temperatures were found to increase slightly with increasing degree of pre-deformation, while the M f and A s temperatures decreased. The TWME is strongly influenced by the M s temperature and the grain size of the specimens, i.e., the highest degree of TWME is always obtained in the specimens with M s ≈ −100 • C and the TWME increases with increasing ratio of grain size to specimen width, where the maximum value of TWME = 3.2% was obtained in the present study. In situ observation of the surface relief at several temperatures on the deformed specimens was also performed and it was found that some restricted martensite variants grow and shrink with temperature change without the typical self-accommodation microstructure in the specimens with large TWME.

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Transformational elasticity in a polycrystalline Cu-Zn-Sn alloy

Cited by 71 publications

References 5 publications

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

Ferromagnetic Co-Ni-Al Shape Memory Alloys with β+γ Two-Phase Structure

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

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Transformational elasticity in a polycrystalline Cu-Zn-Sn alloy

Cited by 71 publications

References 5 publications

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

Effect of grain refinement on the mechanical and shape memory properties of Cu-Al-Mn base alloys

Ferromagnetic Co-Ni-Al Shape Memory Alloys with &beta;+&gamma; Two-Phase Structure

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

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Ferromagnetic Co-Ni-Al Shape Memory Alloys with β+γ Two-Phase Structure