2011
DOI: 10.1115/1.4003108
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Processing of Small Scale Nitinol Billets by Induction Heated Nonconventional Isothermal Extrusion (IHNCIE)

Abstract: This paper describes a novel process designed specifically for extruding small scale billets, between 850°C and 950°C, in very short cycle times of 10 min. Induction heated nonconventional isothermal extrusion (IHNCIE) is used to produce wires of Nitinol and compare its efficacy with wires produced conventionally by hot rolling. With two four to one area reductions, a wire of 3 mm diameter was formed by IHNCIE. The extruded wires showed good superelastic tensile properties. This 3 mm diameter extruded wire exh… Show more

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Cited by 5 publications
(10 citation statements)
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“…159 An overview of SE and SM systems are provided herein with additional details given elsewhere. 28,102,155,[160][161][162][163][164][165] Nitinol's unique properties are due to the solid-solidphase transformation between austenite and martensite and defined by four different transformation temperatures: A s , A f , M s and M f , which are the austenite start, austenite finish, martensite start and martensite finish, respectively. 160 The SE condition presents a high-temperature B2 (Strukturbericht) or 221 (International Tables for Crystallography, space group Pm-3m) austenitic crystal structure with Ni-rich precipitates and is a thermodynamically metastable structure.…”
Section: Bioabsorbable Materialsmentioning
confidence: 99%
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“…159 An overview of SE and SM systems are provided herein with additional details given elsewhere. 28,102,155,[160][161][162][163][164][165] Nitinol's unique properties are due to the solid-solidphase transformation between austenite and martensite and defined by four different transformation temperatures: A s , A f , M s and M f , which are the austenite start, austenite finish, martensite start and martensite finish, respectively. 160 The SE condition presents a high-temperature B2 (Strukturbericht) or 221 (International Tables for Crystallography, space group Pm-3m) austenitic crystal structure with Ni-rich precipitates and is a thermodynamically metastable structure.…”
Section: Bioabsorbable Materialsmentioning
confidence: 99%
“…12. 155,[161][162][163] A small amount of permanent strain (0.5%) may reside in the parent lattice as a result of the concurrent slip, and a hysteresis is observed due to the differences between the stresses required for the nucleation and reversion of the martensite. 102,164 This forward transformation is exothermic and is represented by the upper plateau shown in Fig.…”
Section: Bioabsorbable Materialsmentioning
confidence: 99%
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