A Shape-Memory Alloy for High-Temperature Applications

Duerig, T.W.; Albrecht, J.; Gessinger, Gernot H.

doi:10.1007/bf03338156

Cited by 33 publications

(27 citation statements)

References 9 publications

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“…57 Defekti u strukturi imaju važnu ulogu u martenzitnoj transformaciji γ → ε. Iako je energija defekata vrlo mala, ona predstavlja barijeru za odvijanje martenzitne transformacije kod slitina s prisjetljivosti oblika na bazi željeza. 58 Poboljšanje efekta prisjetljivosti oblika u slitinama FeMnSi može se postići mikrolegiranjem ugljikom i dušikom, međutim treba biti oprezan jer je zabilježen i negativan utjecaj dušika. Utjecaj ugljika može se objasniti povećanjem granice razvlačenja zbog usporavanja kretanja dislokacijskih ravnina.…”

Section: Slitine S Prisjetljivosti Oblika Na Bazi žEljezaunclassified

“…Zbog njihovih iznimnih svojstava pronalaze primjenu u mnogim industrijskim sektorima: -strojarska industrija -cijevne spojnice, šipke za mostove, elementi za prigušenje vibracija -elektroindustrija -antene mobilnih uređaja, osjetnici (senzori), pokretači (aktuatori), električne spojnice i prekidači, sigurnosni ventili -medicina -kardiovaskularna kirurgija (filtri krvnih žila), ortopedska kirurgija (implantati -stentovi, vijci, fiksatori kralježnice), ortodontske naprave, okviri naočala -moda i dekoracija itd. 2,3,5,10,11,25,26,34,58 Slitine poput nitinola dominiraju na komercijalnom tržištu (biomedicina, zrakoplovna industrija, automobilska industrija itd. ), zbog njihova visokog efekta prisjetljivosti oblika, dobre pseudoelastičnosti i superiornih svojstava poput duktilnosti, povoljnih mehaničkih svojstava, korozijske otpornosti, biokompatibilnosti, biofunkcionalnosti, kao i oporavka oblika (tablica 2).…”

Section: 36unclassified

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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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Section: Slitine S Prisjetljivosti Oblika Na Bazi žEljezaunclassified

Section: 36unclassified

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

2014

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“…But among these SMAs NiTiZr and NiAl have the drawback of high brittleness, while high temperature SMAs, such as NiTiPd, are of high cost. Due to these reasons there is a constant search for new and low cost shape memory alloys that can perform satisfactorily at high temperatures [3].…”

Section: Introductionmentioning

confidence: 99%

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Raju

Sampath

2011

Trans Indian Inst Met

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Copper based shape memory alloys have received much focus in recent times because of their good ductility, ease of production and processing and low cost. Earlier investigations have shown that ductility and other mechanical properties of the Cu-Al based shape memory alloys can significantly be improved by adding ternary elements such as Ni and Mn. While Cu-Al-Ni shape memory alloys have better thermal stability and higher operating temperatures, their practical applications are limited because of their poor workability. Cu-Al-Mn shape memory alloys on the other hand, have good ductility and workability, but their operating temperatures are lower. A similar approach is followed in Ni-Al alloys to overcome their brittleness by the addition of Fe. There is paucity of literature on the role of ternary addition of Fe to Cu-Al shape memory alloys. In the present work, therefore, the effect of aluminium and iron on the transformation temperatures has been studied. As the aluminium content increases the transformation temperatures decrease, while the ternary addition of Fe increases the transformation temperatures. The results are presented and discussed in detail in the paper.

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“…Subsequently, the gas-atomized prealloyed powders were consolidated by a variety of methods including hot swaging, hot pressing, hot isostatic pressing, or a combination of them. Duerig et al [24] prepared finegrained, with grain size approximately 20 lm, Cu-Al-Ni SMA rods from prealloyed powders by cold compaction-sintering-hot swaging route. The Cu-Al-Ni SMA rods were found to have fracture stress of 800 MPa together with 5 to 7 pct fracture strain.…”

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confidence: 99%

“…[19][20][21][22][23][24][25][26][27] The PM processing was carried out starting with either elemental powders or prealloyed gas-atomized powders. When starting with elemental powders, the elemental powder mixture was mechanically alloyed by high energy ball milling under inert atmosphere for 40 to 100 hours, and subsequently consolidated by either pressureless sintering or hot pressing followed by hot extrusion.…”

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confidence: 99%

Processing and Characterization of Cu-Al-Ni Shape Memory Alloy Strips Prepared from Prealloyed Powder by Hot Densification Rolling of Powder Preforms

Vajpai

Dube

Sangal

2011

Metall Mater Trans A

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The present work deals with the preparation of near-full density Cu-Al-Ni shape memory alloy (SMA) strips from argon-atomized prealloyed powder via a powder metallurgy (PM) route comprising cold die compaction to prepare powder preforms, sintering, and hot densification rolling of unsheathed sintered powder preforms under protective atmosphere at 1273 K (1000°C). It has been shown that argon-atomized spherical Cu-Al-Ni SMA powder consisted of very fine equiaxed grains and no appreciable grain growth occurred during sintering at 1273 K (1000°C). It also has been shown that no appreciable densification occurred during sintering, and densification was primarily achieved by hot rolling. The densification behavior of the sintered powder preforms during hot rolling was discussed. The hot-rolled Cu-Al-Ni strips were heat-treated at 1223 K (950°C) for 60 minutes and water quenched. The heat-treated strips consisted of equiaxed grains with average size approximately 90 lm. The heat-treated Cu-Al-Ni SMA strips consisted of self-accommodated b 0 1 martensite primarily, and showed smooth b 1 ) b 0 1 transformation behavior coupled with a very low hysteresis (%25 K (25°C)). The heattreated strips exhibited an extremely good combination of mechanical properties with fracture strength of 530 MPa and 12.3 pct fracture strain. The mode of fracture in the finished strip was primarily void-coalescence-type ductile together with some brittle transgranular type. The shape memory tests showed almost 100 pct one-way shape recovery after 100 bending-unconstrained heating cycles at 4 pct applied prestrain, exhibiting good stability of Cu-Al-Ni strips under thermomechanical actuation cycling. The two-way shape memory strain was found approximately 0.45 pct after 15 training cycles at 4 pct training strain.

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A Shape-Memory Alloy for High-Temperature Applications

Cited by 33 publications

References 9 publications

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

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

Influence of aluminium and iron contents on the transformation temperatures of Cu-Al-Fe shape memory alloys

Processing and Characterization of Cu-Al-Ni Shape Memory Alloy Strips Prepared from Prealloyed Powder by Hot Densification Rolling of Powder Preforms

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