Effect of Y Element on the Properties of Cu-Al-Ni High Temperature Shape Memory Alloy

doi:10.11900/0412.1961.2021.00400

Acta Metall Sin

2022, Vol. 58

Issue (8): 1065-1071 DOI: 10.11900/0412.1961.2021.00400

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Effect of Y Element on the Properties of Cu-Al-Ni High Temperature Shape Memory Alloy

ZHANG Xin¹, CUI Bo², SUN Bin³, ZHAO Xu⁴, ZHANG Xin¹(

), LIU Qingsuo¹, DONG Zhizhong¹(

)

^1.School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
^2.Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
^3.College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China
^4.Beijing Tianyi Shangjia High-Tech Materials Co. Ltd., Beijing 102400, China

Cite this article:

ZHANG Xin, CUI Bo, SUN Bin, ZHAO Xu, ZHANG Xin, LIU Qingsuo, DONG Zhizhong. Effect of Y Element on the Properties of Cu-Al-Ni High Temperature Shape Memory Alloy. Acta Metall Sin, 2022, 58(8): 1065-1071.

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Abstract

Cu-Al-Ni alloys are not yet widely used due to issues related to their coarse grains, unacceptable plasticity, and poor thermal stability. Here, the physical and mechanical properties, as well as the corrosion behavior, of Cu-Al-Ni alloys doped with Y element (Cu-13Al-4Ni-xY (x = 0.2, 0.5, mass fraction, %)) were studied. XRD, OM, SEM, TEM, electronic universal testing machine, and electrochemical workstation were used to characterize the microstructures and measure the properties of the Cu-13Al-4Ni-xY alloys. The results showed that at room temperature, the microstructure of Cu-13Al-4Ni-xY alloys was mainly an 18R martensite matrix. The (Cu, Al, Ni)₄Y second phase was characterized to have a hexagonal structure. The mechanical properties of the Cu-13Al-4Ni-xY alloys improved as the Y element content increased. For example, when the Y content was increased from 0% to 0.5%, the compressive fracture strain increased from 10.5% to 19.3% and the fracture strength increased from 580 to 1185 MPa. Additionally, the fracture type of the alloy changed from intergranular to transgranular with the addition of Y. Finally, the results from electrochemical experiments showed that the corrosion behavior of the alloys decreased slightly with the addition of Y.

Key words: Cu-based shape memory alloy microstructure mechanical property shape memory effect

Received: 16 September 2021

ZTFLH:

TV139.2

Fund: National Natural Science Foundation of China(52071236);Natural Science Foundation of Tianjin(18JCYBJC87000)

About author: ZHANG Xin, associate professor, Tel: 18630878641, E-mail: zhangxin3510110@tjut.edu.cnDONG Zhizhong, professor, Tel: 13820371235, E-mail: zhizhong.dong@email.tjut.edu.cn

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	Xin ZHANG
	Bo CUI
	Bin SUN
	Xu ZHAO
	Xin ZHANG
	Qingsuo LIU
	Zhizhong DONG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00400 OR https://www.ams.org.cn/EN/Y2022/V58/I8/1065

Fig.1 OM (a, b) and SEM (c, d) images of Cu-13Al-4Ni-xY alloys with x = 0.2 (a, c) and x = 0.5 (b, d)

Fig.2 XRD spectra of Cu-13Al-4Ni-xY (x = 0.2 and 0.5) alloys

Fig.3 TEM bright field image (a), the corresponding selected area electron diffraction (SAED) patterns of 18R martensite (b) and second phase (c) in the Cu-13Al-4Ni-0.5Y alloy; high resolution transmission electron microscope (HRTEM) image of area d in Fig.3a (Inset shows the fast Fourier transform) (d); EDS element maps of Cu (e), Al (f), Ni (g), and Y (h) for the second phase (d—interplanar spacing)

Fig.4 Compressive stress-strain curves (a), and fracture morphologies of the Cu-13Al-4Ni-xY alloys with x = 0.2 (b) and x = 0.5 (c)

Fig.5 Recovery characteristic curves of the Cu-13Al-4Ni-xY alloys with x = 0.2 (a) and x = 0.5 (b) under pre-strains of 8% and 10%, respectively (The arrow lines represent the recovery strain after heating to 350^oC for 1 min. SME—shape memory effect)

Fig.6 Potential polarization curves for the Cu-13Al-4Ni-xY (x = 0, 0.2, 0.5) alloys in the 3.5%NaCl solution

Table 1 Corrosion parameters of Cu-13Al-4Ni-xY alloys in 3.5%NaCl solution

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