Influence of aluminum and manganese concentration on the shape memory characteristics of Cu–Al–Mn shape memory alloys
TL;DR: In this paper, a linear regression analysis was performed on four sets of Cu-Al-Mn shape memory alloys, in the range of 10-15% of aluminum and 0-10% of manganese, by ingot metallurgy.
About: This article is published in Journal of Alloys and Compounds.The article was published on 2008-07-14. It has received 84 citations till now. The article focuses on the topics: Manganese.
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TL;DR: In this article, a ternary shape memory alloy with different amounts of quaternary elements Zn, Si, Fe, Pb, Ni, Mg, Cr and Ti were added to the base alloy.
82 citations
TL;DR: The work highlights the feasibility of processing manganese anode mud by microwave heating, with excellent responsiveness to microwaves, and investigates the dielectric properties and thermal behavior of pure MnO2, CaSO4 and PbSO4 components.
73 citations
TL;DR: In this article, a pilot-scale study was initiated to evaluate the enhanced effect of microwave heating on carbothermal reduction process of pyrolusite, and the results indicated that the non-conventional technology by microwave heating to reduce low-grade pyroxite is very promising and could be considered for full scale applications.
62 citations
TL;DR: In this article, the incorporation of silver nanoparticles into Cu-based shape memory alloys is recommended to enhance their phase transformation behavior. But, this incorporation can affect their transformation temperatures, mechanical, microstructural and corrosion characteristics.
58 citations
TL;DR: In this article, the effect of Ti additions on the microstructure and mechanical properties of Cu-Al-Ni shape memory alloys (SMA) was studied by means of a differential scanning calorimeter, field emission scanning electron microscopy and X-ray diffraction (XRD).
Abstract: The effect of Ti additions on the microstructure and mechanical properties of Cu–Al–Ni shape memory alloys (SMA) was studied by means of a differential scanning calorimeter, field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction (XRD), a tensile test, a hardness test, and a shape memory effect test. The experimental results show that the Ti additions have an effective influence on the phase transformation behavior through generating a new phase into the microstructure, which is known as X-phase and/or controlling the grain size. The results of the XRD confirmed that the X-phase is a combination of two compounds, AlNi2Ti and Ti3·3Al. Nevertheless, it was found that with 0.7 mass% of Ti, the best phase transformation temperatures and mechanical properties were obtained. These improvements were due to the highest existence of the X-phase into the alloy along with a noticeable decrement of grain size. The Ti additions to the Cu–Al–Ni SMA were found to increase the ductility from 1.65 to 3.2 %, corresponding with increasing the strain recovery by the shape memory effect from 50 to 100 %; in other words, a complete recovery occurred after Ti additions.
54 citations
Cites background from "Influence of aluminum and manganese..."
...The increase in ductility with the addition of the Ti element may be attributed to the significant microstructural changes and presence of X-phase associated with decrease in the degree of order of the alloys, whereas this decrement can cause an increase in the ductility and workability of the alloys [38, 39]....
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TL;DR: The ductile shape memory (SM) alloys of the Cu-AI-Mn system have been developed by controlling the degree of order in the β phase as mentioned in this paper, and they exhibit excellent ductility.
Abstract: Ductile shape memory (SM) alloys of the Cu-AI-Mn system have been developed by controlling the degree of order in the β phase. Additions of Mn to the binary Cu-Al alloy stabilize the β phase and widen the single-phase region to lower temperature and lower Al contents. It is shown that Cu-Al-Mn alloys with low Al contents have either the disordered A2 structure or the ordered L21 structure with a lower degree of order and that they exhibit excellent ductility. The disordered A2 phase martensitically transforms to the disordered Al phase with a high density of twins. The martensite phase formed from the ordered L21 phase has the 18R structure. The SM effect accompanies both the A2 → Al and L21 → 18R martensitic transformations. These alloys exhibit 15 pct strain to failure, 60 to 90 pct rolling reduction without cracking, and 80 to 90 pct recovery from bend test in the martensitic condition. Experimental results on the microstructure, crystal structure, mechanical properties, and shape memory behavior in the ductile Cu-AI-Mn alloys are presented and discussed.
207 citations
TL;DR: In this paper, the phase equilibria between the phases α (A1), β (A2, B2 or L21(D03)) and γ (γ-bronze type), and the two-stage order-disorder transition and decomposition reaction A2-B2-L21 in the ternary system Cu-Al-Mn are reported.
152 citations
25 Jul 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this article, the ductile Cu-Al-Mn-based shape memory alloys (SMAs) have been used for guidewire applications and shown to have various properties of superelasticity, shape memory effect, two-way memory effect and internal friction.
Abstract: Recent progress on ductile Cu–Al–Mn-based shape memory alloys (SMAs) is presented. The various properties of superelasticity (SE), the shape memory effect (SME), the two-way memory effect (TWME) and internal friction are enhanced by controlling grain size and texture through thermomechanical treatments. It is also shown that the control of stress-induced martensitic transformation due to cold-rolling of Cu–Al–Mn SMAs results in low thermal expansion (LTE). In addition, the medical application of the Cu–Al–Mn-based SMAs to guidewire is introduced.
147 citations
TL;DR: In this article, a significant improvement in the degree of superelasticity in Cu-Al-Mn ductile polycrystalline alloys has been achieved through the addition of Ni and control of the recrystallization texture by thermomechanical processing, which contain the annealing in the fcc (α) + bcc (β) two-phase region, followed by heavy cold reductions of over 60 pct.
Abstract: A significant improvement in the degree of superelasticity in Cu-Al-Mn ductile polycrystalline alloys has been achieved through the addition of Ni and control of the recrystallization texture by thermomechanical processing, which contain the annealing in the fcc (α) + bcc (β) two-phase region, followed by heavy cold reductions of over 60 pct. The addition of Ni to the Cu-Al-Mn alloys shows a drastic effect on the formation of the strong {112} 〈110〉 recrystallization texture. Superelastic strains on the order of 7 pct, 3 times larger than those in other Cu-based shape-memory alloys (SMAs), have been realized in the textured Cu-Al-Mn-Ni alloys. The superelastic strains obtainable in the textured Cu-based SMAs are on a par with those attainable in Ni-Ti-based alloys.
104 citations
15 Dec 1999-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the effect of alloying elements on the shape memory properties of ductile shape memory (SM) alloys was investigated by differential scanning calorimetry, cold-rolling and tensile test techniques.
Abstract: The effect of alloying elements on the Ms temperature, ductility and the shape memory properties of Cu–Al–Mn ductile shape memory (SM) alloys was investigated by differential scanning calorimetry, cold-rolling and tensile test techniques. It was found that the addition of Au, Si and Zn to the Cu73–Al17–Mn10 alloy stabilized the martensite (6M) phase increasing the Ms temperature, while the addition of Ag, Co, Cr, Fe, Ni, Sn and Ti decreased the stability of the martensite phase, decreasing the Ms temperature. The SM properties were improved by the addition of Co, Ni, Cr and Ti.
91 citations