Thermodynamic analysis of the effect of annealing on the thermal stability of a Cu–Al–Ni–Mn shape memory alloy

Mazzer, Eric M.; Kiminami, Cláudio Shyinti; Bolfarini, Claudemiro; Cava, R.D.; Gargarella, Piter

doi:10.1016/j.tca.2015.03.024

Cited by 32 publications

(12 citation statements)

References 19 publications

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“…The microstructure was first investigated by OM and SEM. , which exhibits a zig-zag morphology, which is in accordance with the literature 1,11,13,24,25 . The grains show a columnar morphology due to the plate solidification process by suction casting.…”

Section: Resultssupporting

confidence: 92%

“…In fact, Cu-Al-Ni SMAs show some advantageous properties compared with Ti-based SMAs, like an excellent behavior on micro and nano scale, which provides a competitive advantage to the function in sensors and actuators in micro electromechanical systems 9 . Furthermore, Cu-based SMAs when compared with Ti-based SMAs present relatively low cost of raw materials and processing, better thermal and electrical conductivity, easiness to process and higher transformation temperatures 7,8,10,11 .…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, some applications are limited and an improvement in the mechanical properties is required in order to make these SMAs suitable for application in industry. The ductility has been considerably improved by the addition of Mn to Cu-Al-Ni SMAs without resulting in a significant change of the transformation temperatures 1,7,11 . The addition of other alloying elements such as Zr, as well as thermomechanical treatments, powder metallurgy and rapid solidification have been used to further improve the ductility of Cu-based SMAs 2,[12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of a Laser Surface Remelted Cu-Based Shape Memory Alloy

et al. 2018

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Cu-based shape memory alloys (SMAs) present some advantages as higher transformation temperatures, lower costs and are easier to process than traditional Ti-based SMAs but they also show some disadvantages as low ductility and higher tendency for intergranular cracking. Several studies have sought for a way to improve the mechanical properties of these alloys and microstructural refinement has been frequently used. It can be obtained by laser remelting treatments. The aim of the present work was to investigate the influence of the laser surface remelting on the microstructure of a Cu-11.85Al-3.2Ni-3Mn (wt%) SMA. Plates were remelted using three different laser scanning speeds, i.e. 100, 300 and 500 mm/s. The remelted regions showed a T-shape morphology with a mean thickness of 52, 29 and 23 µm and an average grain size of 30, 29 and 23µm for plates remelted using scanning speed of 100, 300 and 500 mm/s, respectively. In the plates remelted with 100 and 300 mm/s some pores were found at the root of the keyhole due to the keyhole instability. We find that the instability of keyholes becomes more pronounced for lower scanning speeds. It was not observed any preferential orientation introduced by the laser treatment.

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Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructural Characterization of a Laser Surface Remelted Cu-Based Shape Memory Alloy

et al. 2018

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“…Ligas com memória (LMF) de forma caracterizam-se como ligas que apresentam o efeito de memória de forma (EMF), ou seja, capacidade de retornar a seu formato original após deformação plástica quando aquecidas acima de uma temperatura crítica [1][2] [3] [4]. Essas ligas também apresentam outras características como pseudoelasticidade e alta capacidade de amortecimento [2], as quais possibilitam uma vasta gama de aplicações para essa classe de materiais.…”

Section: Introductionunclassified

“…Entre as ligas com memória de forma se destacam aquelas à base de Ti e Ni, que apresentam ótimas propriedades mecânicas e excelente biocompatibilidade, e as ligas a base de Cu, que não apresentam propriedades mecânicas elevadas, mas apresentam custo de produção reduzido [3] [5]. Essas ligas apresentam propriedades variadas, as quais culminam com um aumento no potencial para aplicações comerciais [4]. Nos últimos anos, as ligas com memória de forma vêm recebendo uma importância maior no campo científico e diversas aplicações têm sido apresentadas, sendo essas em áreas diversas que abrangem tanto biomateriais, como sensores e atuadores [6].…”

Section: Introductionunclassified

Análise Das Perspectivas De Aplicações Das Ligas Com Memória De Forma Por Meio De Levantamento De Patentes

Silva¹,

Kiminami²,

Leiva³

et al. 2017

Anais Do Congresso Anual Da ABM

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ResumoLigas com memória de forma (LMFs) são ligas metálicas capazes de recuperar o seu formato e tamanho original após deformação plástica quando aquecidas acima de uma temperatura crítica. Diversos casos de possíveis aplicações paras as LMF têm sido justificados no campo científico, com alguns poucos casos identificados para aplicação em massa, existindo uma ausência na literatura de uma análise crítica da aplicabilidade das mesmas que leve em consideração aspectos industriais e de mercado. Dessa forma, se faz necessário um estudo mais aprofundado que correlacione as ideias científicas geradas com a produção industrial e com a comercialização de LMFs. Nesse contexto, o trabalho visa através de levantamento e análise de patentes e artigos científicos, assim como por contatos industriais, estabelecer uma relação entre o desenvolvimento científico e o comercial das LMFs. Mais de 11 mil artigos e mais de 7 mil patentes foram produzidos nos últimos 16 anos, sendo observado uma tendência crescente da criação de conhecimento de LMF, o qual já vem sendo aplicado na indústria, justificando assim os esforços observados no campo científico. A área biomédica se destaca como a mais bem estabelecida no campo das LMF, com destaque para a utilização das ligas a base de NiTi. Palavras-chave: Ligas com memória de forma; Aplicabilidade; Patentes; Indústria. ANALYSIS OF SHAPE MEMORY ALLOYS APPLICATION PERSPECTIVE BY SURVEY AND ANALYSIS OF PATENTS AbstractShape Memory Alloys (SMA) are metallic alloys capable of recovering their original shape and size after plastic deformation when heated above a critical temperature. Many potentials applications have been justified in scientific field, with just few of them being for mass application. There is an absence in the literature of an analysis about applicability of SMAs, which takes into account industrial and market aspects. Thus, a further study is necessary in order to correlate the scientific ideas generated with the industrial production and commercialization of the SMAs. In this context, the present work aims through survey and analysis of patents and scientific papers, as well as through industrial contacts, stablish a relationship between the scientific and the commercial development of SMAs. More than 11 thousand articles and more than 7 thousand patents were produced in the last 16 years. It was observed a growing tendency of knowledge creation about SMAs, which is already being applied in industrial field, justifying the efforts observed in scientific field. The biomedical area stands out as the most well-stablished in the production of SMA, and the NiTi SMA stands out as the SMA most used on the industry overall.

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Influence of aging on transformation characteristic and phase structure of a Cu–12.4Al–1.2Ti–1.2Ta shape memory alloy

Yildiz

2020

Appl. Phys. A

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Thermodynamic analysis of the effect of annealing on the thermal stability of a Cu–Al–Ni–Mn shape memory alloy

Cited by 32 publications

References 19 publications

Microstructural Characterization of a Laser Surface Remelted Cu-Based Shape Memory Alloy

Microstructural Characterization of a Laser Surface Remelted Cu-Based Shape Memory Alloy

Análise Das Perspectivas De Aplicações Das Ligas Com Memória De Forma Por Meio De Levantamento De Patentes

Influence of aging on transformation characteristic and phase structure of a Cu–12.4Al–1.2Ti–1.2Ta shape memory alloy

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