Journal ArticleDOI
Enhancement of superelasticity in Cu-Al-Mn-Ni shape-memory alloys by texture control
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TLDR
In this article, a significant improvement in the degree of superelasticity in Cu-Al-Mn ductile polycrystalline alloys has been achieved through the addition of Ni and control of the recrystallization texture by thermomechanical processing, which contain the annealing in the fcc (α) + bcc (β) two-phase region, followed by heavy cold reductions of over 60 pct.Abstract:
A significant improvement in the degree of superelasticity in Cu-Al-Mn ductile polycrystalline alloys has been achieved through the addition of Ni and control of the recrystallization texture by thermomechanical processing, which contain the annealing in the fcc (α) + bcc (β) two-phase region, followed by heavy cold reductions of over 60 pct. The addition of Ni to the Cu-Al-Mn alloys shows a drastic effect on the formation of the strong {112} 〈110〉 recrystallization texture. Superelastic strains on the order of 7 pct, 3 times larger than those in other Cu-based shape-memory alloys (SMAs), have been realized in the textured Cu-Al-Mn-Ni alloys. The superelastic strains obtainable in the textured Cu-based SMAs are on a par with those attainable in Ni-Ti-based alloys.read more
Citations
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Journal ArticleDOI
High temperature shape memory alloys
TL;DR: Shape memory alloys (SMAs) with high transformation temperatures can enable simplifications and improvements in operating efficiency of many mechanical components designed to operate at tem... as mentioned in this paper, which can enable simplified and improved operating efficiency.
Journal ArticleDOI
Ferrous Polycrystalline Shape-Memory Alloy Showing Huge Superelasticity
TL;DR: A ferrous polycrystalline, high-strength, shape-memory alloy exhibiting a superelastic strain of more than 13%, with a tensile strength above 1 gigapascal, which is almost twice the maximum supeRELastic strain obtained in the Ni-Ti alloys.
Journal ArticleDOI
A family of ductile intermetallic compounds.
Karl A. Gschneidner,Alan M. Russell,Alexandra O. Pecharsky,James R. Morris,Zhehua Zhang,Thomas A. Lograsso,David K. Hsu,C.H. Chester Lo,Y. Y. Ye,Y. Y. Ye,Aaron Slager,David Kesse +11 more
TL;DR: Although conventional wisdom calls for special conditions, such as non-stoichiometry, metastable disorder or doping to achieve some ductility in intermetallic compounds at room temperature, none of these is required in these unique B2 rare-earth compounds.
Journal ArticleDOI
Effect of grain size and texture on pseudoelasticity in Cu–Al–Mn-based shape memory wire
TL;DR: In this article, the effect of grain size on pseudoelastic behaviors was investigated in shape memory alloy (SMA) wires, and the Taylor and inverse Schmid factors were expressed using the volume fraction of three-dimensional constrained grains.
Journal ArticleDOI
Characteristics of Cu–Al–Mn-based shape memory alloys and their applications
TL;DR: In this article, the ductile Cu-Al-Mn-based shape memory alloys (SMAs) have been used for guidewire applications and shown to have various properties of superelasticity, shape memory effect, two-way memory effect and internal friction.
References
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Journal ArticleDOI
The crystallography of martensite transformations II
J.S Bowles,J.K Mackenzie +1 more
TL;DR: In this paper, the total strain in a martensite transformation was derived from the orientation relationship and the component strains, together with the correspondence, and the dimensions of the initial and final structures.
Journal ArticleDOI
Orientation imaging: The emergence of a new microscopy
TL;DR: In this paper, a new microscopy called orientation imaging microscopy is described, which is based on precise measurements of local lattice orientation facilitated by backscattered Kikuchi diffraction.
Journal ArticleDOI
Development of Shape Memory Alloys
Shuichi Miyazaki,Kazuhiro Otsuka +1 more
TL;DR: In this article, the shape memory effect and shape memory mechanisms are discussed on the basis of the crystal structure and the crystallography of the martensitic transformations of shape memory alloys.
Journal ArticleDOI
Superelasticity effects and stress-induced martensitic transformations in CuAlNi alloys
TL;DR: In this article, a new treatment in terms of an effective stress has been presented for analysis of the characteristics of a superelastic loop, such as the presence or absence of a peak at the yield point and the magnitude of the hysteresis.