Improvement of the shape memory characteristics of a Cu-Zn-Al alloy with manganese and zirconium addition

Zou, Wenming; Lam, C.W.H.; Chung, C.Y.; Lai, J.K.L.

doi:10.1016/s1359-6462(96)00496-4

Cited by 11 publications

(7 citation statements)

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“…Thus, some studies have focused to enhance the general properties and cold workability of Cu-based alloys. It is known that rare earth elements are often used as alloying element to refine the grain boundary and improve the mechanical properties [6][7][8][9][10]. It has been reported that the addition of alloying rare earth elements such as Cr, Zr, V, Pb or B improves the mechanical properties and ductility.…”

Section: Introductionmentioning

confidence: 99%

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

et al. 2016

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Cr-doped CuAlMn shape memory alloys were produced by arc melting method. The effects of Cr content on microstructure and transformation parameters of were investigated. The alloys were characterized by X-ray analysis, optical microscope observations and differential scanning calorimetry measurements. The grain size of the alloys was decreased by the addition of Cr into CuAlMn alloy system. The martensite transformation temperature was shifted both the lower temperature and higher temperature with the addition of chromium. This change was explained on the basis of the change in the thermodynamics such as enthalpy, entropy and activation energy values. The obtained results indicate that the phase transformation temperatures of the CuAlMn alloy system can be controlled by addition of Cr. We fabricated a Schottky barrier diode and observed that ideality factor and barrier height increase with increasing temperature. The diodes exhibited a thermal sensor behavior. This indicates that Schottky diode-based Cu-Al-Mn-Cr shape memory material films can be used as a sensor in high-temperature measurement applications.

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Section: Introductionmentioning

confidence: 99%

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

et al. 2016

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“…For example, with the increase of manganese concentration, the thermoelastic and pseudoelastic behaviors of Cu-Al-Ni-Mn-B SMAs were enhanced and the ductility of the alloy was improved. [8] Zr-rich precipitates formed in a Zr-added Cu-Zn-Al SMA. [5,6,7] As a modification of Cu-Zn-Al SMAs, Zr and Mn are added to the Cu-Zn-Al alloy to refine the grain size of the alloy, to increase the ductility of the matrix, and to suppress the stabilization of the martensite.…”

Section: Introductionmentioning

confidence: 99%

“…The structure of the parent phase and martensite phase are DO 3 (or L2 1 ) and M18R 1 , respectively. [8] Zr-rich precipitates formed in a Zr-added Cu-Zn-Al SMA. Energy-dispersive X-ray spectroscopy (EDXS) analysis with a TEM indicates that the two precipitates are all new phases and have the compositions of Cu 50.2 Zr 24.6 Al 17.3 Zn 7.9 (at.…”

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confidence: 98%

Microstructural studies of a Cu-Zn-Al shape-memory alloy with manganese and zirconium addition

Zou

Lam

Chung

et al. 1998

Metall Mater Trans A

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Mn and Zr were added to improve the shape-memory characteristics of a Cu-Zn-Al shape-memory alloy (SMA). The microstructure of a Cu-19.0Zn-13.1Al-1.1Mn-0.3Zr (at. pct) alloy was examined using a transmission electron microscope (TEM). The structure of the parent phase and martensite phase are DO 3 (or L2 1 ) and M18R 1 , respectively. Two kinds of Zr-rich precipitates formed in the alloy. Energy-dispersive X-ray spectroscopy (EDXS) analysis with a TEM indicates that the two precipitates are all new phases and have the compositions of Cu 50.2 Zr 24.6 Al 17.3 Zn 7.9 (at. pct) (Z 1 phase) and Cu 57.4 Zr 20.4 Zn 10.3 Al 11.9 (at. pct) (Z 2 phase), respectively. The volume ratio of Z 1 phase in the alloy is about 70 pct of the total precipitate volume. The structure of Z 1 phase was studied in detail using TEM electron diffraction analyses. The lattice parameter of fcc Z 1 phase is a ϭ 1.24 nm, and the space group of the phase is F432 (No. 209). The Z 1 phase possesses an incoherent interface with the parent-phase matrix. The lattice correspondence of the Z 1 phase and parent-phase matrix is as follows:The effect of precipitate formation on the shape-memory characteristics of the Cu-Zn-Al-Mn-Zr alloy is discussed and compared to some other Cu-based SMAs. I. INTRODUCTIONCu-Zn-Al is an important Cu-based shape-memory alloy (SMA) which possesses a good shape-memory effect (SME) and has the advantage of a lower price than the Ti-Ni SMA. However, it suffers from martensitic stabilization [1] and intergranular cracking during processing and service because of the large shape-memory anisotropy and large grain size when in the ␤ parent-phase condition. [2] The addition of suitable alloying elements can improve the mechanical properties and stabilize the martensitic transformations and the SME of a Cu-based SMA. For example, with the increase of manganese concentration, the thermoelastic and pseudoelastic behaviors of Cu-Al-Ni-Mn-B SMAs were enhanced and the ductility of the alloy was improved. [3,4] On the other hand, the elements B, V, Zr, and Ti can be added to refine the grain size of the parent phase in Cu-based SMAs. [5,6,7] As a modification of Cu-Zn-Al SMAs, Zr and Mn are added to the Cu-Zn-Al alloy to refine the grain size of the alloy, to increase the ductility of the matrix, and to suppress the stabilization of the martensite. Compared to a Cu-Zn-Al SMA, a significant grain refinement effect was found in the Cu-Zn-Al-Zr and Cu-Zn-Al-Mn-Zr alloys, and the characteristics of martensitic transformation in the Cu-Zn-Al-Mn-Zr alloy are better than those of the Cu-Zn-Al SMA. [8] Zr-rich precipitates formed in a Zr-added Cu-Zn-Al SMA. These precipitates were initially observed in the Cu-Zn-Al-Zr alloy and at the grain boundaries. [5] However, in a Cu-19.0Zn-13.1Al-1.1Mn-0.3Zr (at. pct) SMA, Zr-rich precipitates appeared not only in the vicinity of grain boundaries

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“…Tables I and II are constructed from a detailed data pool gleaned from the literature. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] Tables I and II give the inputs and outputs of the GP. The inputs are the elements to produce the alloy and the thermal treatments that are applied to the alloy.…”

Section: Introductionmentioning

confidence: 99%

“…[30] A content of Mn up to 12 wt pct may improve the ductility, the formation of the c 2 phase, and the machining properties. [17] Figure 9 shows the effect of the less soluble element Ti on T 0 temperature in Cu-based SMAs. The addition of Code Function Set S1 +, À, 9, /, Ö, power(x,y), 10 x , Ln, 1/X, X 2 , X 3 , X 4 , X 5 , X 1/3 , X 1/4 , X 1/5 , Add3, Sub3, Mul3, Div3, Add4 S2 +, À, 9, /, Ö, power(x,y), 10 x , Ln, 1/X, X 2 , X 3 , X 4 , X 5 , X 1/3 , X 1/4 , X 1/5 S3 +, À, 9, /, Ö, power(x,y), 10 x , Ln, 1/X, X 2 , X 3 , X 4 , X 5 S4 +, À, 9, /, Ö, power(x,y), 10 x , Ln, 1/X Ti (~l pct) produced a significant change.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Thermodynamic Equilibrium Temperature of Cu-Based Shape-Memory Smart Materials

Eskil

Aldaş

Özkul

2014

Metall Mater Trans A

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The thermodynamic equilibrium temperature (T 0 ) is an important factor in the austenite and martensitic phases. In this study, the effects of alloying elements and heat treatments on T 0 temperature were investigated using Genetic Programming (GP) which has become one of the tools used in the study of condensed matter. Due to the changes in T 0 , it is possible to analyze the changes in the entropy of the phase transitions. The data patterns of the GP formulation are based on well-established experimental results from the literature. The results of the GP-based formulation were compared with experimental results and found to be reliable with a very high correlation (R 2 = 0.965 for training and R 2 = 0.952 for testing).

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Improvement of the shape memory characteristics of a Cu-Zn-Al alloy with manganese and zirconium addition

Cited by 11 publications

References 0 publications

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

New type of Schottky diode-based Cu–Al–Mn–Cr shape memory material films

Microstructural studies of a Cu-Zn-Al shape-memory alloy with manganese and zirconium addition

Prediction of Thermodynamic Equilibrium Temperature of Cu-Based Shape-Memory Smart Materials

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