Effects of Aging and Co Addition on Martensitic and Magnetic Transitions in Ni–Al–Fe β-based Shape Memory Alloys

Oikawa, Katsunari; Tanaka, Yuuki; Sutou, Yuji; Omori, Toshihiro; Luo, Fenghua; Kainuma, Ryosuke; Ishida, K.

doi:10.2355/isijinternational.46.1287

Cited by 4 publications

(2 citation statements)

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“…On the other hand, aging at 300uC or above caused significant reduction in ductility within 10 h; this loss was attributed to the formation of the Ni 5 Al 3 phase. 228 Oikawa et al 229 reported a 5uC decrease in transformation temperatures in Ni 56?5 Al 25 Fe 18?5 dual phase alloy after 1 h aging at 200uC, and an 80uC decrease in transformation temperatures after 1 h aging at 300uC in the same alloy. The large reduction in transformation temperature during aging at 300uC was attributed to the formation of an iron rich bcc phase.…”

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 97%

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High temperature shape memory alloys

Ma¹,

Караман²,

Noebe³

2010

International Materials Reviews

848

371

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Shape memory alloys (SMAs) with high transformation temperatures can enable simplifications and improvements in operating efficiency of many mechanical components designed to operate at temperatures above 100uC, potentially impacting the automotive, aerospace, manufacturing and energy exploration industries. A wide range of these SMAs exists and can be categorised in three groups based on their martensitic transformation temperatures: group I, transformation temperatures in the range of 100-400uC; group II, in the range of 400-700uC; and group III, above 700uC. In addition to the high transformation temperatures, potential high temperature shape memory alloys (HTSMAs) must also exhibit acceptable recoverable transformation strain levels, long term stability, resistance to plastic deformation and creep, and adequate environmental resistance. These criteria become increasingly more difficult to satisfy as their operating temperatures increase, due to greater involvement of thermally activated mechanisms in their thermomechanical responses. Moreover, poor workability, due to the ordered intermetallic structure of many HTSMA systems, and high material costs pose additional problems for the commercialisation of HTSMAs. In spite of these challenges, progress has been made through compositional control, alloying, and the application of various thermomechanical processing techniques to the point that several likely applications have been demonstrated in alloys such as Ti-Ni-Pd and Ti-Ni-Pt. In the present work, a comprehensive review of potential HTSMA systems are presented in terms of physical and thermomechanical properties, processing techniques, challenges and applications.

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Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 97%

“…The large reduction in transformation temperature during aging at 300uC was attributed to the formation of an iron rich bcc phase. 229 III.1?6.b. Ni-Mn system The Ni-Mn alloy system is similar to the Ni-Al system in many aspects.…”

Section: Iii1?4 Co Based Non-thermoelastic Htsmasmentioning

confidence: 99%