Effect of Mn on Ageing of Cu-Al-Ni-Mn-B Alloys

Seguı́, C.; Cesari, E.

doi:10.1051/jp4:1995229

Cited by 8 publications

(7 citation statements)

References 3 publications

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“…Although copper-based shape memory alloys are susceptible to low temperature ageing effects which can radically alter the transformation behaviour, CuAINi shape memory alloys are known to exhibit a better thermal stability than CuZnAl alloys and this characteristic makes them suitable to be used in applications above 373 K, which is the limit for the CuZnAl alloys [1, 2,3]. These alloys are more stable at high temperatures than CuZnAl alloys, raising the upper temperature limit of operation for shape memory devices, and they are claimed to be less prone to martensite stabilization [4], As a high temperature shape memory material, CuAINi alloys have attracted widespread interest; effects of heat treatment on the transformation and mechanical behaviour [5,6,7]. For the optimization of shape memory alloys and improvement of hardness, Treppmann and Hornbogen have reported that different properties have to be connected such as optimization of functional qualities and structural properties [8].…”

Section: Introductionmentioning

confidence: 99%

Improvement of Hardness and Microstructures by Ageing in Shape Memory CuAlNi Alloys

Aydoğdu

Adigüzel

1997

J. Phys. IV France

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Abstract. The shape memory CuAINi alloys, having a composition near that of Cu 3 AI, exhibit disorder-order transition from the disordered bcc p-phase to the ordered pj-phase (D0 3 type) at high temperatures. Although the P,-phase is a non-equilibrium phase, it nonetheless remains stable at room temperature upon quenching from the high temperature P-phase. At the lower temperatures, the Pj-phase itself undergoes martensitic transformation and displays layered structure called M18R. The influence of ageing on two CuAINi p-phase alloys was studied by measuring the time dependence of hardness, lattice parameters and by-optical microscopy observation at room temperature. Hardness shows a trend to decrease with the ageing duration due to the formation of precipitation, and grain size is also affected by ageing.

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Section: Introductionmentioning

confidence: 99%

Improvement of Hardness and Microstructures by Ageing in Shape Memory CuAlNi Alloys

Aydoğdu

Adigüzel

1997

J. Phys. IV France

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“…Za slitinu CuAlNi najčešći je mikrolegirajući element titanij, koji stvara precipitate χ-faze ((Cu,Ni) 2 TiAl) koji sprječavaju porast zrna. 1,29,30 Mangan se kao legirajući element dodaje zbog povećanja duktilnosti slitina CuAlNi, te je odgovoran za nastanak β-faznog područja i poboljšanje termomehaničkih svojstva slitina s prisjetljivosti oblika. 1,16,35 Praktična primjena slitina CuAlNi ograničena je zbog slabe obradivosti i krhkosti (intergranularni lom).…”

Section: 38unclassified

“…S druge strane, njena praktična primjena je ograničena zbog teške obradljivosti i sklonosti krhkom lomu na granici zrna. [12][13][14][15][16][17] Međutim postoji niz prednosti slitine CuAlNi u odnosu na slitinu NiTi s prisjetljivosti oblika: lakše taljenje, lijevanje i kontrola kemijskog sastava, veći Youngov modul elastičnost, viša radna temperatura i, što je najvažnije, veća stabilnost dvosmjernog efekta prisjetljivosti oblika. 9,13,18 Cilj rada je pregledno prikazati najčešće upotrebljavane slitine s prisjetljivosti oblika, postupke proizvodnje te svojstva i primjenu navedenih materijala.…”

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“…27,28 Komercijalno dostupne slitine s prisjetljivosti oblika na bazi bakra su CuZnAl i CuAlNi te njihove četverokomponentne inačice. 1,29,30 Slitine CuZnAl s prisjetljivosti oblika Slitina CuZnAl je druga komercijalno primijenjena slitina s prisjetljivosti oblika, odmah nakon NiTi. U usporedbi sa slitinom NiTi, slitina CuAlZn je jednostavnija i jeftinija za proizvodnju, ima bolju električnu i toplinsku provodnost te veću duktilnost.…”

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Slitine s prisjetljivosti oblika (II. dio): podjela, proizvodnja i primjena

2014

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Slitine s prisjetljivosti oblika (II. dio): podjela, proizvodnja i primjena Slitine s prisjetljivosti oblika funkcionalni su "pametni" materijali s jedinstvenim svojstvom prisjetljivosti oblika. Prisjetljivost oblika karakteristična je sposobnost materijala koja je posljedica martenzitne fazne transformacije, a karakterizira je vraćanje slitine u oblik koji je imala prije deformacije. U radu su detaljno objašnjene slitine s prisjetljivosti oblika s gledišta njihove podjele, proizvodnje i primjene. U industrijskoj primjeni najčešće se upotrebljavaju slitine na bazi nikla i titanija, te slitine na bazi bakra. Slitine na bazi željeza i plemenitih metala još uvijek nemaju značajniju industrijsku primjenu. Slitine s prisjetljivosti oblika uglavnom se proizvode postupcima indukcijskog taljenja, brzog očvršćivanja (primjerice melt spinning) i kontinuiranog lijevanja.

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“…Whereas the Cu-Al-Ni family of SMAs is more widely studied, here we introduce Mn as well. Mn is known to prevent brittle γ phase (Cu9Al4) formation, enabling good superelasticity [20][21][22].…”

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confidence: 99%

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

Tunçer

Schuh

2016

Scripta Materialia

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Continuous production of shape memory alloy (SMA) fibers and microfibers is a non-trivial task due to the challenges associated with their undeformed memory and, for many copper-based SMAs, brittleness in non-engineered forms. Here we demonstrate the direct continuous casting of super-meter-scale Cu-based SMA microfibers into a desirable oligocrystalline microstructure that is not brittle. The melt-casting process used here develops a favorable texture as well, leading to large superelastic strains (above 8 %), beyond what is typical for non-single-crystal SMAs. Cu-based shape memory alloys (SMAs) generally perform poorly when they are polycrystalline, due to intergranular cracking associated with their high elastic anisotropy and transformation mismatch strains. However, the same brittle SMAs can exhibit excellent shape memory and superelasticity, as well as fatigue properties that approach those of single crystals, when they are produced in fine dimensions and with a specific grain microstructure: an oligocrystalline or "bamboo" grain structure where the grain boundaries lay almost perpendicular to the fiber axis, reducing relative grain boundary area [1,2]. These materials could be used in a number of novel applications, such as smart textiles, if they could be manufactured in large quantities via a continuous process.

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Effect of Mn on Ageing of Cu-Al-Ni-Mn-B Alloys

Cited by 8 publications

References 3 publications

Improvement of Hardness and Microstructures by Ageing in Shape Memory CuAlNi Alloys

Improvement of Hardness and Microstructures by Ageing in Shape Memory CuAlNi Alloys

Slitine s prisjetljivosti oblika (II. dio): podjela, proizvodnja i primjena

Melt-cast microfibers of Cu-based shape memory alloy adopt a favorable texture for superelasticity

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