Microstructure and transformation related behaviors of a Ni45.3Ti29.7Hf20Cu5 high temperature shape memory alloy

Karaca, H.E.; Acar, Emre; Ded, G.S.; Saghaian, Sayed M.; Başaran, B.; Tobe, Hirobumi; Kök, Mediha; Maier, Hans Jürgen; Noebe, Ronald D.; Chumlyakov, Yuriy

doi:10.1016/j.msea.2014.12.111

Cited by 48 publications

(36 citation statements)

References 54 publications

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“…Numerous alloys have been characterized, and Ni-Ti alloys have been the main focus of SMA activities [1][2][3]5,8]. As Ni-Ti inherently is limited in its applicability due to relatively high processing costs and transformation temperatures below 100 °C, new alloys have been proposed in recent years aiming at overcoming these limitations [3,[4][5][6][7][9][10][11]. Iron-based alloys that profit from low processing costs and SMAs revealing increased transformation temperatures, referred to as high-temperature (HT-)SMAs, were developed for broadening the application range of SMAs [3,[4][5][6][7][8][9][10][11].…”

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confidence: 99%

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

et al. 2015

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confidence: 99%

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

et al. 2015

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“…High-temperature shape memory alloys (HT-SMAs) have been mainly developed for applications in aerospace, automotive, energy exploration, and conversion industries, where the operating temperatures are often well above 100°C [2]. Particularly HT-SMAs such as Ni-Ti-X (X = Pt, Pd, Au, Hf, Zr) and Zr-Cu-based alloys have been studied in detail lately [2,[17][18][19][20]. However, either their poor workability or the extremely high cost of the constituent elements typically hinder widespread applications of these alloys.…”

Section: Introductionmentioning

confidence: 99%

Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

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et al. 2015

Shap. Mem. Superelasticity

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Conventional shape memory alloys cannot be employed for applications in the elevated temperature regime due to rapid functional degradation. Co-Ni-Ga has shown the potential to be used up to temperatures of about 400°C due to a fully reversible superelastic stress-strain response. However, available results only highlight the superelastic response for single cycle tests. So far, no data addressing cyclic loading and functional fatigue are available. In order to close this gap, the current study reports on the cyclic degradation behavior and tensioncompression asymmetry in [001]-oriented Co 49 Ni 21 Ga 30 single crystals at elevated temperatures. The cyclic stressstrain response of the material under displacement controlled superelastic loading conditions was found to be dictated by the number of active martensite variants and different resulting stabilization effects. Co-Ni-Ga shows a large superelastic temperature window of about 400°C under tension and compression, but a linear Clausius-Clapeyron relationship could only be observed up to a temperature of 200°C. In the present experiments, the samples were subjected to 1000 cycles at different temperatures. Degradation mechanisms were characterized by neutron diffraction and transmission electron microscopy. The results in this study confirm the potential of these alloys for damping applications at elevated temperatures.

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“…Geliştirilen bu yüksek sıcaklık alaşım sistemlerine NiTiHf, NiTiPt, NiTiPd ve NiTiHfPd gibi alaşımlar örnek olarak verilebilir. Özellikte yüksek sıcaklık ve yüksek dayanım gerektiren uygulamalar için NiTiHf ve NiTiHfPd alaşım sistemleri ümit vericidir [10,30,[34][35][36][37][38].…”

Section: şEkil 11unclassified

Havacilik Ve Uzay Uygulamalarinda Şeki̇l Hafizali Alaşimlar

Acar

Oktay

2018

Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi

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ÖZŞekil hafızalı alaşımlar metalik akıllı malzeme grubu olup fonksiyonel özellik ile birlikte mekanik dayanım da gerektiren uygulamalar için günümüzde kullanılan ve kullanım alanları hızla genişleyen malzemelerdir. Bu makalede şekil hafızalı alaşımların temel fonksiyonel özelliklerinden ve bu özellikleri meydana getiren mekanizmalardan bahsedilmiştir. Daha sonra, şekil hafızalı alaşımların havacılık ve uzay alanındaki mevcut ve potansiyel uygulamaları derlenmiştir. Anahtar Kelimeler: Şekil hafızalı alaşımlar, havacılık ve uzay uygulamaları, faz dönüşümleri SHAPE MEMORY ALLOYS IN AEROSPACE APPLICATIONS ABSTRACTAs a metallic class of smart materials, shape memory alloys are commonly used and have promising potentials in applications that require a good strength beside functional properties. In this study, fundamental properties and their mechanisms are discussed. Afterwards, aerospace applications of shape memory alloys are reviewed.

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Microstructure and transformation related behaviors of a Ni45.3Ti29.7Hf20Cu5 high temperature shape memory alloy

Cited by 48 publications

References 54 publications

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

Martensite stabilization in shape memory alloys – Experimental evidence for short-range ordering

Functional Fatigue and Tension–Compression Asymmetry in [001]-Oriented Co49Ni21Ga30 High-Temperature Shape Memory Alloy Single Crystals

Havacilik Ve Uzay Uygulamalarinda Şeki̇l Hafizali Alaşimlar

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