CuZnAl Shape Memory Alloys Foams

2012 ◽  
Vol 78 ◽  
pp. 31-39 ◽  
Author(s):  
Ausonio Tuissi ◽  
Paola Bassani ◽  
Carlo Alberto Biffi
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Physical And Mechanical Properties ◽  
Metal Foams ◽  
Cellular Structures ◽  
Metallic Materials ◽  
Open Cell ◽  
Liquid Infiltration ◽  
Highly Porous ◽  
Metal Infiltration

Foams and other highly porous metallic materials with cellular structures are known to have many interesting combinations of physical and mechanical properties. That makes these systems very attractive for both structural and functional applications. Cellular metals can be produced by several methods including liquid infiltration of leachable space holders. In this contribution, results on metal foams of Cu based shape memory alloys (SMAs) processed by molten metal infiltration of SiO2 particles are presented. By using this route, highly homogeneous CuZnAl SMA foams with a spherical open-cell morphologies have been manufactured and tested. Morphological, thermo-mechanical and cycling results are reported.

scholarly journals HYBRID SOLUTION FOR TWO-WAY INDUCED SHAPE MEMORY ACTUATOR

2020 ◽  
Vol 26 (1) ◽  
pp. 34-36
Author(s):  
Girolamo Costanza ◽  
Maria Elisa Tata
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Hybrid Composites ◽  
Low Cost ◽  
Research Field ◽  
Metallic Materials ◽  
Hybrid Solution ◽  
Production Problems ◽  
Deformation Recovery

The actuation capability and the reliability of hybrid composites activated by shape memory alloys are discussed in this work. The manufacturing of compact and safe actuators has been possible employing thermo-activated SMA which allows the polymer-based matrix to undertake many geometries. Different technological procedures are proposed for the manufacturing of this type of composites and the production problems are discussed too. The adoption of non-metallic materials as deformation recovery elements, even if at present they do not allow a complete reversibility of the imposed deformation, represent an interesting research field, due to their properties of lightness, flexibility and low cost.

Fabrication Methods and Properties of Open and Closed Cell Foams

2006 ◽  
Vol 15-17 ◽  
pp. 428-432
Author(s):  
I.Ch. Konstantinidis ◽  
D.P. Papadopoulos ◽  
M. Gavaises ◽  
D.N. Tsipas
Keyword(s):  
Three Dimensional ◽  
Morphological Characteristics ◽  
Metal Foams ◽  
Cell Geometry ◽  
Three Dimensional Model ◽  
Open Cell ◽  
Closed Cell ◽  
Microscopy Techniques ◽  
Metal Infiltration ◽  
Infiltration Techniques

In this paper we present some simple methods for the fabrication of closed and open cell Al metal foams. The closed cell Al metal foams were fabricated using liquid metallurgy. Their microstructure and morphological characteristics were studied using optical and electron microscopy techniques. The mechanical properties and their relationship to microstructure were established. A three dimensional model was developed relating the cell geometry to the mechanical behavior of Al closed cell foam material. The open cell Al foams were fabricated using sodium chloride powder sinters and liquid Al metal infiltration techniques. The potential of using these cellular structures in various systems is discussed.

Preliminary Results of Copper Based Shape Memory Alloys Analyze Used for MEMS Applications

2013 ◽  
Vol 371 ◽  
pp. 368-372 ◽  
Author(s):  
Nicanor Cimpoeşu ◽  
Adela Ioana Ursanu ◽  
Sergiu Stanciu ◽  
Ramona Cimpoeşu ◽  
Boris Constantin ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Surface ◽  
Volume Ratio ◽  
Damping Capacity ◽  
Metallic Materials ◽  
Micro Electro Mechanical Systems ◽  
Unique Shape ◽  
Deposition Processes ◽  
Promising Alloys

Shape memory alloys (SMAs) are commonly used in micro-electro-mechanical systems (MEMS). Having the unique shape memory, super-elastic affects and now damping capacity SMAs have become an important smart material for a broad range of engineering applications in last years. Copper based SMAs are promising alloys, based on the obtaining price and good characteristic properties. Shape memory alloys as thin films are used for fast actuation in applications due to their high surface to volume ratio comparing to bulk SMAs. In this paper two shape memory alloys based on copper, proposed as targets in different deposition processes to obtain MEMS and with different chemical composition, are analyzed through scanning electrons microscope (SEM), XRD and EDAX considerations after water quenching and recovery heat treatments. The martensite variants are dimensioned and 3D aspects are also analyzed for both metallic materials. The metallic phases obtained after heat treatment are determined and compare in both thermal influenced cases.

Processing of Shape Memory CuZnAl Open-cell Foam by Molten Metal Infiltration

2009 ◽  
Vol 18 (5-6) ◽  
pp. 484-489 ◽  
Author(s):  
E. M. Castrodeza ◽  
C. Mapelli ◽  
M. Vedani ◽  
S. Arnaboldi ◽  
P. Bassani ◽  
...  
Keyword(s):  
Shape Memory ◽  
Molten Metal ◽  
Open Cell ◽  
Open Cell Foam ◽  
Metal Infiltration ◽  
Cell Foam

Functional Characterization of Shape Memory CuZnAl Open-Cell Foams by Molten Metal Infiltration

2011 ◽  
Vol 20 (4-5) ◽  
pp. 544-550 ◽  
Author(s):  
S. Arnaboldi ◽  
P. Bassani ◽  
F. Passaretti ◽  
A. Redaelli ◽  
A. Tuissi
Keyword(s):  
Shape Memory ◽  
Molten Metal ◽  
Functional Characterization ◽  
Open Cell ◽  
Open Cell Foams ◽  
Metal Infiltration

Effects of the substitution of gallium with boron on the physical and mechanical properties of Ni–Mn–Ga shape memory alloys

2014 ◽  
Vol 117 (4) ◽  
pp. 2073-2078 ◽  
Author(s):  
Yildirim Aydogdu ◽  
Ali Sadi Turabi ◽  
Mediha Kok ◽  
Ayse Aydogdu ◽  
Hirobumi Tobe ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Physical And Mechanical Properties

Damping Capacity of Metallic Materials for Automotive Industry

2017 ◽  
Vol 750 ◽  
pp. 164-167
Author(s):  
Radu Cristian Crăciun ◽  
Sergiu Stanciu ◽  
Nicanor Cimpoeşu ◽  
Ramona Cimpoeşu ◽  
Vasile Manole
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Automotive Industry ◽  
Mechanical Energy ◽  
Damping Capacity ◽  
Mechanical Resistance ◽  
Metallic Materials ◽  
Low Velocity ◽  
Viable Solution ◽  
Damping Materials

New requests from the automotive industry suppose to apply new materials with mechanical resistance to heat and vibrations and also with low weight. In order to replace plastic materials with high damping capacity a viable solution can be the metallic materials with sufficient internal friction to transform the external mechanical energy in thermal energy without affecting the microstructure or the mechanical properties of the metallic materials. In automotive applications an important role, especially in low velocity impacts, are the bumper elements. In this article possibility of copper-based shape memory alloys to fulfill the damping necessity of metallic materials is analyzed. Dynamic - mechanical analyze of few copper based shape memory alloys is realized and the results compared to proposed a better solution of Cu-based shape memory alloy for damping materials applications. The damping capacity difference between martensite and austenite like phases is also analyzed.

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