Fabrication of porous samples from a high-temperature Cu–Al–Ni–Mn–Nb shape memory alloy by freeze-drying and partial sintering

Lapér, Miguel L.; Guimarães, Raul; Barrioni, Breno Rocha; Silva, Philipe A. P.; Houmard, Manuel; Mazzer, Eric M.; Nunes, Eduardo H.M.

doi:10.1016/j.jmrt.2020.01.105

Cited by 15 publications

(3 citation statements)

References 56 publications

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“…The most common procedure is adding a fourth alloying element, such as Ti, Zr, Cr, etc. The second method is related to the manufacturing procedures, such as rapid solidification, powder metallurgy and equal channel angular extrusion [ 35 ].…”

Section: Discussionmentioning

confidence: 99%

In Vitro Evaluation of the Potential Anticancer Properties of Cu-Based Shape Memory Alloys

Lazić

Milašin

et al. 2023

Materials

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Due to the unique functional properties of shape memory alloys (SMAs) and current scientific interest in Cu-containing biomaterials, a continuously cast Cu-Al-Ni alloy in the form of rods has been investigated as a potential candidate for biomedical application. Additionally, the fact that Cu- complexes have an antitumour effect served as a cornerstone to develop more efficient drugs based on trace element complexes. In line with that, our study aimed to analyse the basic properties of the Cu-Al-Ni alloy, along with its anticancer properties. The detailed chemical analysis of the Cu-Al-Ni alloy was performed using XRF and SEM/EDX analyses. Furthermore, a microstructural and structure investigation was carried out, combined with hardness measurements using the static Vickers method. Observations have shown that the Cu-Al-Ni microstructure is homogeneous, with the presence of typical martensitic laths. XRD analysis confirmed the presence of two phases, β′ (monoclinic) and γ′ (orthorhombic). The viability of osteosarcoma cells in contact with the Cu-Al-Ni alloy was evaluated using epifluorescence microscopy, while their morphology and attachment pattern were observed and analysed using a high-resolution SEM microscope. Biocompatibility testing showed that the Cu-Al-Ni alloy exerted a considerable antineoplastic effect.

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Section: Discussionmentioning

confidence: 99%

In Vitro Evaluation of the Potential Anticancer Properties of Cu-Based Shape Memory Alloys

Lazić

Milašin

et al. 2023

Materials

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“…Yield strengths comparable to cast alloys have been obtained for Cu-Al-Ni-Mn and Cu-Al-Ni-Mn-Zr (≈ 200 MPa) but with a larger ductility in tension, as a result of the greater microstructural refinement [64]. Also using atomized powders, porous scaffolds of a Cu-Al-Ni-Mn-Nb alloy were developed by Láper et al [69]. The structures were produced through freeze-drying and sintering.…”

Section: Recent Developments Of Cu-based Sma New Processing Routes Of Cu-based Shape Memory Alloys (Sma)mentioning

confidence: 99%

Revisiting Cu-based shape memory alloys: Recent developments and new perspectives

Mazzer

Silva

Gargarella

2022

Journal of Materials Research

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Cu-based shape memory alloys belong to one important class of functional alloys, presenting shape memory effect and superelasticity due to their reversible martensitic transformation. Although they have been extensively studied since the middle of the last century, there are still many challenges to be solved. In the last decades, these alloys were extensively studied regarding new compositions, processing routes, phase transformation, mechanical and functional properties. Aspects of the thermoelastic phase transformation have been described using thermodynamic and thermo-mechanical studies, while the role of metallurgical features (such as grain size and morphology, ordering, precipitates and second phases) have been described mainly by phenomenological approach. In this sense this review discusses the advances in the general fundamentals of Cu-based shape memory alloys, the recent developments in processing routes, compositions, and applications in the last years. Graphical abstract

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“…Unfortunately, they have to face the problems such as complexity, reliability, and energy dissipation performance (significantly lower than one-time used landing gears at equal mass). Shape memory alloy (SMA) is a so-called smart material with the characteristics of superelasticity, shape memory effect (SME) and high damping [16,17]. Benefited from these properties, SMA has a potential to be used in the future to design a reusable landing gear.…”

Section: Introductionmentioning

confidence: 99%

A Footpad Structure with Reusable Energy Absorption Capability for Deep Space Exploration Lander: Design and Analysis

Dou,

Qiu,

Xiong

et al. 2023

Chin. J. Mech. Eng.

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The footpad structure of a deep space exploration lander is a critical system that makes the initial contact with the ground, and thereby plays a crucial role in determining the stability and energy absorption characteristics during the impact process. The conventional footpad is typically designed with an aluminum honeycomb structure that dissipates energy through plastic deformation. Nevertheless, its effectiveness in providing cushioning and energy absorption becomes significantly compromised when the structure is crushed, rendering it unusable for reusable landers in the future. This study presents a methodology for designing and evaluating structural energy absorption systems incorporating recoverable strain constraints of shape memory alloys (SMA). The topological configuration of the energy absorbing structure is derived using an equivalent static load method (ESL), and three lightweight footpad designs featuring honeycomb-like Ni-Ti shape memory alloys structures and having variable stiffness skins are proposed. To verify the accuracy of the numerical modelling, a honeycomb-like structure subjected to compression load is modeled and then compared with experimental results. Moreover, the influence of the configurations and thickness distribution of the proposed structures on their energy absorption performance is comprehensively evaluated using finite element simulations. The results demonstrate that the proposed design approach effectively regulates the strain threshold to maintain the SMA within the constraint of maximum recoverable strain, resulting in a structural energy absorption capacity of 362 J/kg with a crushing force efficiency greater than 63%.

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Fabrication of porous samples from a high-temperature Cu–Al–Ni–Mn–Nb shape memory alloy by freeze-drying and partial sintering

Cited by 15 publications

References 56 publications

In Vitro Evaluation of the Potential Anticancer Properties of Cu-Based Shape Memory Alloys

In Vitro Evaluation of the Potential Anticancer Properties of Cu-Based Shape Memory Alloys

Revisiting Cu-based shape memory alloys: Recent developments and new perspectives

A Footpad Structure with Reusable Energy Absorption Capability for Deep Space Exploration Lander: Design and Analysis

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