Production and Mechanical Properties of Cu-Al-Ni-Be Shape Memory Alloy Thin Ribbons Using a Cold Co-Rolled Process

Abstract

The use of shape memory alloys for micro-actuators constitutes a field of application in which copperaluminum-based alloys find their usefulness because they can reach higher activation temperatures and are easier to produce than titanium-based alloys, particularly by the method proposed in this work. SMA tapes are a two-dimensional structure that offers many design options such as stamping, punching, and deep drawing, but they are also suitable for laser cutting, engraving, stamping, and EDM machining. This work has been made to study the manufacture of copper-based shape memory alloys (SMAs) using the cold co-rolling process also called the cold-roll bonding (CRB) process. In this process, a thin metal sandwich can be produced with a rolling machine. This sandwich consists of layers of CuNiBe master alloy and Al. During the rolling phase, the sandwich has no shape memory effect (SME) or superelastic effect (SE), so thin strips can be easily produced. After the rolling phase, the sandwich is subjected to a complex heat treatment to gain the SME. To validate this process to produce Cu-based SMAs, several alloys with different CuAlNiBe compositions have been tested. The SMAs obtained were characterized by optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The martensitic transformation was studied by Differential Scanning Calorimetry (DSC) and SME and SE were studied by three-point bending tests. This work shows that the CRB is a good process for making a wide variety of Cu-based SMA ribbons.

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

“…The literature is consistent in the conclusion that the biofunctional properties of Cu-based alloys need to be examined comprehensively in the context of the materials production processes [ 5 , 6 , 7 ]. In recent years, several very successful studies have been accomplished with continuous casting (small dimension rods of Au-and Ag–based alloys) [ 8 , 9 , 10 ].…”

Razvoj legura s prisjetljivošću oblika na bazi bakra u okviru znanstveno-istraživačkih projekata na Metalurškom fakultetu Sveučilišta u Zagrebu

“…"melt-spinning" tehnika), lijevanje u kokile (metalne kalupe), kontinuirano lijevanje, metalurgiju praha, lasersko taljenje itd. [10][11][12][13][14][15][16][17][18][19] Ovisno o kemijskom sastavu legura, toplinskoj obradi nakon austenitizacije s hlađenjem u vodi može se dobiti martenzitna mikrostruktura koja je preduvjet za efekt prisjetljivosti oblika.…”

Experimental Study of Ultrasound-Assisted Reaming of Carbon Fiber-Reinforced Plastics/Titanium Alloy Stacks

“…Reaming is the process of removing a very thin layer of material from the hole wall with a reamer to improve dimensional accuracy and surface quality. However, the bolt holes of CFRP/Ti stacks made by the existing reaming process still cannot reach the excellent tolerance requirement [11][12][13][14][15][16]. Moreover, other problems also exist.…”