Behavior and Preparation of Single Crystal of Cu-Al-Ni-Be SMA

In this paper, single crystal of CuAlNiBe shape memory alloy (SMA) was prepared in a high temperature gradient directional solidification furnace with a selective growing crystallizer. And its performance characters were systematically studied. The results show that the mechanical and shape memory properties of the single crystal of CuAlNiBe SMA alloy has much better than that of the polycrystalline material. This may be explained that the stress concentration at grain boundary caused by the difference of bilateral strains is the dominant reason of deterioration of fatigue properties; therefore single crystal alloy possesses the excellent properties duo to its elimination of grain boundary.

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A Study on Shape Memory Performance of Cu-Al-Ni-Be Alloy Single Crystal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.287-290.21 ◽

2011 ◽

Vol 287-290 ◽

pp. 21-25

Author(s):

Hua Ping Xu ◽

Gao Feng Song ◽

Xie Min Mao

Keyword(s):

High Temperature ◽

Temperature Gradient ◽

Shape Memory Alloy ◽

Single Crystal ◽

Shape Memory ◽

Directional Solidification ◽

Memory Performance ◽

Copper Base ◽

Shape Memory Properties ◽

Solidification Furnace

In this paper, single crystal of CuAlNiBe quaternary shape memory alloy was prepared in a high temperature gradient directional solidification furnace with a selective growing crystallizer. And its shape memory performance characters were systematically compared with other series copper base shape memory alloys. The results show that the single crystal of CuAlNiBe quaternary shape memory alloy has better shape memory properties.

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Microstructure, thermomechanical and shape memory properties of two-phase Ni–Mn–Fe–Ga high-temperature shape memory alloys with B addition

Intermetallics ◽

10.1016/j.intermet.2013.01.007 ◽

2013 ◽

Vol 37 ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Shuiyuan Yang ◽

Cuiping Wang ◽

Zhan Shi ◽

Xingjun Liu

Keyword(s):

High Temperature ◽

Shape Memory Alloys ◽

Shape Memory ◽

Two Phase ◽

Shape Memory Properties

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Transformation Temperatures, Shape Memory and Magnetic Properties of Hafnium Modified Ti-Ta Based High Temperature Shape Memory Alloys

High Temperature Materials and Processes ◽

10.1515/htmp-2015-0113 ◽

2017 ◽

Vol 36 (2) ◽

pp. 113-119

Author(s):

W.Q. Khan ◽

Q. Wang ◽

X. Jin

Keyword(s):

High Temperature ◽

Shape Memory ◽

Alloy System ◽

Heat Of Reaction ◽

Transformation Temperatures ◽

Dsc Measurements ◽

Recovery Strain ◽

Shape Memory Properties ◽

Three Point Bend Test ◽

Point Bend

AbstractIn this study the modification effect of Hf content on the shape memory properties and magnetic permeability of a 75.5-77Ti-20Ta-3-4.5Hf alloy system has been systematically studied by DSC, three-point bend test, vector network analyzer and XRD. The martensitic transformation temperature, heat of reaction and recovery strain increases with the increase of hafnium and tantalum content. A stable high temperature shape memory effect was observed (Ms = 385–390 °C) during the two thermal cycles between 20 °C and 725 °C. Transformation temperatures and heats of reaction were determined by DSC measurements. Recovery strain was determined by three-point bend testing. Also an alloy, 70Ti-26Ta-4Hf, with higher tantalum content was produced to observe the effect of Ta on the shape memory properties. Permeability increases gradually from 1.671 to 1.919 with increasing content of hafnium modification and remains stable in the frequency range of 450 MHz to 1 GHz.

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Giant two-way shape memory effect in high-temperature Ni–Mn–Ga single crystal

Physics Procedia ◽

10.1016/j.phpro.2010.11.081 ◽

2010 ◽

Vol 10 ◽

pp. 94-98 ◽

Cited By ~ 15

Author(s):

V.A. Chernenko ◽

E. Villa ◽

S. Besseghini ◽

J.M. Barandiaran

Keyword(s):

High Temperature ◽

Single Crystal ◽

Shape Memory ◽

Shape Memory Effect ◽

Memory Effect

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Mechanical and shape memory properties of Ni54Mn25Ga21 high-temperature shape memory alloy

Materials Science and Engineering A ◽

10.1016/j.msea.2006.02.163 ◽

2006 ◽

Vol 438-440 ◽

pp. 978-981 ◽

Cited By ~ 21

Author(s):

Yan Li ◽

Yan Xin ◽

Chengbao Jiang ◽

Huibin Xu

Keyword(s):

High Temperature ◽

Shape Memory Alloy ◽

Shape Memory ◽

Shape Memory Properties

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Effect of the Addition of Gd on Ni53Mn22Co6Ga19 High-Temperature Shape Memory Alloy

Materials Science Forum ◽

10.4028/www.scientific.net/msf.654-656.2095 ◽

2010 ◽

Vol 654-656 ◽

pp. 2095-2098

Author(s):

Yun Qing Ma ◽

Shui Yuan Yang ◽

San Li Lai ◽

Shi Wen Tian ◽

Cui Ping Wang ◽

...

Keyword(s):

Grain Size ◽

High Temperature ◽

Martensitic Transformation ◽

Shape Memory Alloy ◽

Shape Memory ◽

Earth Element ◽

Stress And Strain ◽

Martensitic Transformation Temperature ◽

Rich Phase ◽

Shape Memory Properties

The rare earth element Gd is added to Ni53Mn22Co6Ga19 high-temperature shape memory alloy to refine the grain size and adjust the distribution of γ phase, and their microstructure, martensitic transformation behaviors, mechanical and shape memory properties were investigated. The results show that the grain size is obviously decreased and the γ phase tends to segregate at grain boundaries with increasing Gd content. Small amounts of Gd-rich phase were formed with 0.1 at.% Gd addition. The martensitic transformation temperature abruptly increases with 0.1 at.% Gd addition, then almost keeps constant with further increasing Gd content. The addition of 0.1 at.% Gd is proved to be beneficial to both tensile stress and strain before fracture, but negative to the shape-memory effect.

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