Spark plasma sintering of Cu–Al–Ni shape memory alloy

Portier, R.; Ochin, P.; Pasko, Alexandre; Monastyrsky, G.E.; Gilchuk, A.V.; Kolomytsev, V. I.; Koval, Yu. N.

doi:10.1016/j.jallcom.2012.02.145

Cited by 32 publications

(16 citation statements)

References 15 publications

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“…They are embedded into the matrix, which seems to be mixture of Al and Cu oxides derived from the nanofraction of spark erosion powder. This result has been already reported elsewhere in details [4,6].…”

Section: Phase Content and Microstructure Of Sintered Samplessupporting

confidence: 90%

“…These collections seem to be the result of feasible scenarios of the transformations between the different type of oxides and Cu-Al-Ni particles during the preliminary ageing followed by spark plasma sintering. To explain the transformation of CuO oxide into Cu 2 O oxide and large heat release, which has been observed at 900C during the heating of powder, the redox reactions between the CuO oxide and Al in as-prepared powder has been proposed in [4,6]. Current TEM investigation has shown that there are several scenarios of such transformations, which could be fulfilled during the heat treatments of powder.…”

Section: Binder Fraction Formation Mechanismmentioning

confidence: 99%

“…Therefore, the spark plasma sintering (SPS) method looks as a promising one-step process alternative to the conventional sintering of pre-alloyed powders. In our previous work [4], massive Cu-13.01Al-3.91Ni-0.37Ti-0.24Cr wt.% shape memory alloy was synthesized by the spark plasma sintering method from pre-alloyed powder prepared by the spark-erosion method (SE) in liquid argon. XRD, EDS, Auger microanalyses showed that the composite structure of spark-plasma sintered compacts appears due to the interaction between Al and CuO oxide from superficial layers of submicron particles as well as nanofractions of powder.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material

Monastyrsky¹,

Kоtkо²,

Gilchuk³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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The microstructure of Cu-13.0Al-3.9Ni-0.4Ti-0.2Cr wt.% compacts sintered by spark plasma method from powders prepared by spark-erosion method in liquid argon from master alloy is investigated. Powder is annealed in H 2 atmosphere before the spark plasma sintering. SEM and TEM investigations reveal that sintered samples have a composite structure, which consists of the micron and submicron spherical metallic particles embedded into the binder matrix. This matrix seems to be the product of copper oxide reduction according to the scheme CuO  Cu 4 O 3  Cu 2 O  Cu 8 O and aluminium hydroxides' conversion according to the flowchart aluminium hydroxide  transition alumina  -Al 2 O 3 , during the annealing and/or sintering. TEM study reveals that main phase in metallic particles is self-accommodated 18R martensite. The regular basal plane stacking faults and/or (001) 18R microtwins are dominant defects in 18R martensite. 18R martensite of single orientation occupies entire volume of spherical nanoparticles, being the basal plane stacking faults and/or (001) 18R microtwins, which have different thicknesses.Досліджено мікроструктуру компактів Cu-13,0Al-3,9Ni-0,4Ti-0,2Cr ваг.% спечених плазмово-іскровим методом із електроерозійних порош-ків, виготовлених із мастер-стопу в рідкому арґоні. Перед спіканням по- Встановлено, що основною фазою в металевих частинках є самоузгодже-ний багатоваріянтний 18R-мартенсит, домінантні дефекти якого є реґу-лярними дефектами пакування в базовій площині та/або (001) 18R -мікродвійники. Весь об'єм сферичних наночастинок займає одноваріянт-ний 18R-мартенсит; при цьому дефекти пакування в базовій площині та/або (001) 18R -мікродвійники мають різні товщини.Исследована микроструктура компактов Cu-13,0Al-3,9Ni-0,4Ti-0,2Cr масс.%, спечённых плазменно-искровым методом из электроэрозионных порошков, изготовленных из мастер-сплава в жидком аргоне. Перед спе-канием порошок отжигался в атмосфере водорода. Спечённые образцы имеют композитную структуру, которая состоит из микронных и субмик-ронных сферических металлических частиц, встроенных в связующую матрицу. Последняя является результатом восстановления при отжиге и/или спекании оксида меди согласно схеме CuO  Cu 4 O 3  Cu 2 O  Cu 8 O и гидроксидов алюминия согласно схеме гидроксид алюминия  пере-ходный оксид алюминия  -Al 2 O 3 . Установлено, что основной фазой в металлических частицах является самосогласованный многовариантный 18R-мартенсит, доминантными дефектами которого являются регуляр-ные дефекты упаковки в базовой плоскости и/или (001) 18R -микро-двойники. Весь объём сферических наночастиц занимает одновариант-ный 18R-мартенсит; при этом дефекты упаковки в базовой плоскости и/или (001) 18R -микродвойники имеют разные толщины.

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Section: Phase Content and Microstructure Of Sintered Samplessupporting

confidence: 90%

Section: Binder Fraction Formation Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material

Monastyrsky¹,

Kоtkо²,

Gilchuk³

et al. 2016

Metallofiz. Noveishie Tekhnol.

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“…En ambos casos se obtuvieron nanopartículas después de largos tiempos de molienda y partiendo de elementos puros (Radev, 2010;Amini et al, 2013). Para conseguir piezas consolidadas de las aleaciones con memoria de forma se han utilizado diferentes téc-nicas de sinterizado, por ejemplo las aleaciones de Ni-Mn-Ga y Cu-Al-Ni fueron procesadas mediante Spark Plasma Sintering (SPS) (Tian et al, 2011;Tian et al, 2012;Portier et al, 2013). El principal objetivo fue conservar las propiedades de memoria de forma de los polvos fabricados a partir de la aleación fundida y conseguir una reducción en la porosidad y por consiguiente aumentar sus propiedades mecánicas.…”

Section: Introductionunclassified

Caracterización de la aleación Ni53.5-Fe19.5-Ga27 con memoria de forma ferromagnética producida por metalurgia de polvos

Olmos¹,

Alvarado-Hernández²,

Jiménez³

et al. 2015

REVMETAL

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RESUMEN:La principal desventaja de las aleaciones con memoria de forma ferromagnéticas obtenidas por fundición es su fragilidad. Para superar esta desventaja la metalurgia de polvos es una técnica ideal para la consolidación de las piezas, por lo que este trabajo se orientó a estudiar el efecto generado por los procesos de molienda y sinterizado de polvos sobre la evolución de las fases cristalinas que le confieren la memoria de forma a estos materiales. Para ello se prepararon polvos de la aleación ferromagnética con memoria de forma Ni 53.5 -Fe 19.5 -Ga 27 a partir de un lingote fundido mediante molienda mecánica, durante dos tiempos diferentes de molienda de 30 y 60 minutos. La evolución de las fases fue estudiada mediante difracción de rayos X (DRX) a alta temperatura (HTXRD), mientras que el sinterizado fue evaluado por medio de ensayos de dilatometría. Los estudios de DRX mostraron que se pueden presentar cuatro fases diferentes en función del tamaño de partí-cula y de la temperatura de tratamiento térmico. Los polvos de tamaños más gruesos presentaron una estructura B2 acompañados de la fase γ mientras que los más finos presentaban una estructura L2 1 , cuando se trataron por debajo de 1173 K. Por otro lado, los polvos más finos tenían una estructura martensítica modulada M14 después del sinterizado a una temperatura superior a 1273 K. El sinterizado de los polvos fue lento y no indicó claramente un mecanismo de difusión de masa predominante. Ni 53.5 ferromagnetic shape memory alloy produced by powder metallurgy. The main drawback of ferromagnetic shape memory alloys fabricated through casting methods are its brittleness. In order to overcome this disadvantage, powder metallurgy is an ideal technique for the consolidation of many engineering parts. This paper is focused on the study of the milling and sintering effects of metallic powders over the evolution of the crystalline phases responsibly for the shape memory effect of these materials. To achieve this objective, ferromagnetic shape memory alloy powders (Ni 53.5 -Fe 19.5 -Ga 27 ) were prepared from a cast ingot by mechanical milling at two different times of 30 and 60 minutes. The evolution of the phases was ABSTRACT: Characterization of Ni

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“…。但是传统方法制备的铜基形状记忆合金具有塑性性能差，可加工性差，易脆性断裂，马氏体稳定化等一系列问题 [4][5] ，限制了铜基记忆合金的应用与发展，晶粒粗大是这些问题的最主要诱因。常见的细化晶粒的方法是加入一些晶粒细化元素，如 B、Ti、V、Co、Zr、Mn [6][7] 等。此外，还有采用等径角挤压、双辊铸轧、熔融纺丝等技术，但是上述方法限制了制件的尺寸，制备的条料厚度仅为 0.5 mm 左右 [8][9] 。作为 3D 打印家族重要的技术之一，激光选区熔化技术(Selective laser melting， SLM)在成形的过程中由于激光的快热和快冷，使得合金在熔化后具有极大的冷却速度，冷却速度可以达到 1×10 3 ～1×10 8 K/s，抑制了晶粒的生长，可以得到细小的晶粒 [10][11] 。此外，激光选区熔化技术通过将三维模型转变为二维切片，并逐层熔化粉末成形，因此不受构件复杂程度的影响，具有制造柔性，在制造复杂功能构件方面具有极大的优势，可以节省许多机加工序，因此采用激光选区熔化技术制备铜基形状记忆合金具有广泛的应用前景。目前，已经有一些学者对激光选区熔化成形形状记忆合金做了相关的研究。 GARGARELLA 等 [12] 研究了激光选区熔化技术制备 Cu-Al-Ni 基形状记忆合金的可行性，用该技术制备了致密度达 92%以上的圆柱体，并研究了 SLM 制备铜基合金的微观组织，热稳定性和机械性能。 GUSTMANN 等 [13] 利用激光选区熔化技术在激光功率为 300 W，扫描速度为 700 mm/s [14] 。进一步地，该团队研究了重熔工艺对 Cu-Al-Ni 基形状记忆合金的作用，发现重熔可以提高块体的致密度，改变显微组织形貌，相变温度，不经过热处理手段就能够改善合金的性能 [15]…”

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Study on CuZnAl Memory Alloy Fbricated by Selective Laser Melting

Liu¹,

Song²,

Zhang³

et al. 2019

Journal of Mechanical Engineering

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：Copper based shape memory alloy was fabricated by selective laser melting successfully. The relative density, phase composition, microstructure and mechanical properties of samples with different energy density were investigated. The results shows that with the increase of energy density, relative density increases first and then decreases. The content of β phase decreases with the increase of the energy density. When energy density reaches 194.4 J/mm 3 , β phase disappears and there is only a phase left. Microstructure observation shows that there is lamellar α phase in the bulk fabricated by selective laser melting, which different from the short rod like α phase formed in the casting bulk. Tensile strength increases with the increase of energy density because of the decreased porosity. The maximum tensile strength can reach 328.3 MPa. While the microhardness decreases with the increase of energy density due to the change of phase composition.

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Spark plasma sintering of Cu–Al–Ni shape memory alloy

Cited by 32 publications

References 15 publications

Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material

Microstructure Investigation of the Spark Plasma Sintered Cu—Al—Ni Shape Memory Material

Caracterización de la aleación Ni<sub>53.5</sub>-Fe<sub>19.5</sub>-Ga<sub>27</sub> con memoria de forma ferromagnética producida por metalurgia de polvos

Study on CuZnAl Memory Alloy Fbricated by Selective Laser Melting

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