Influence of Alloying Element Addition on Cu-Al-Ni High-Temperature Shape Memory Alloy without Second Phase Formation

doi:10.1007/s40195-016-0467-1

Abstract

Abstract:

In this study, the effects of rare earth Gd and Fe elements on the microstructure, the mechanical properties and the shape memory effect of Cu-11.9Al-3.8Ni high-temperature shape memory alloy were investigated by optical microscopy, scanning electron microscopy, X-ray diffraction and compression test. The microstructure observation results showed that both Cu-11.9Al-3.8Ni-0.2Gd and Cu-11.9Al-3.8Ni-2.0Fe-0.2Gd alloys displayed the fine grain and single-phase \(\beta^{\prime}_{1}\) martensite, and their grain size was about several hundred microns, one order of the magnitude smaller than that of Cu-11.9Al-3.8Ni alloy. The compression test results proved that the mechanical properties of Cu-11.9Al-3.8Ni alloy were dramatically improved by alloying element additions due to grain refinement and solid solution strengthening, and the compressive fracture strains of Cu-11.9Al-3.8Ni-0.2Gd and Cu-11.9Al-3.8Ni-2.0Fe-0.2Gd were 12.0% and 17.8%, respectively. When the pre-strain was 10%, the reversible strains of 5.4% and 5.9% were obtained for Cu-11.9Al-3.8Ni-0.2Gd and Cu-11.9Al-3.8Ni-2.0Fe-0.2Gd alloys after being heated to 500 °C for 1 min, and the obvious two-way shape memory effect was also observed.

Key words: High-temperature shape memory alloys, Shape memory effect, Microstructure, Cu-Al-Ni alloy

Xin Zhang,Qing-Suo Liu. Influence of Alloying Element Addition on Cu-Al-Ni High-Temperature Shape Memory Alloy without Second Phase Formation[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(9): 884-888.

Figures/Tables 5

Fig. 1 Optical micrographs and X-ray diffraction pattern of Cu1 alloy

Fig. 2 Optical micrographs, backscattered electron images and X-ray diffraction pattern of Cu2a, c and e and Cu3b, d, f

Table 1 Results of the compositions examinations (wt%)

Sample	Cu	Al	Ni	Gd	Fe
Cu₁	83.82	12.21	3.97	-	-
Cu₂	83.67	12.18	3.92	0.23	-
Cu₃	81.5	12.27	4.01	0.19	2.03

Fig. 3 Stress-strain curves of Cu1, Cu2, Cu3

Fig. 4 Strain recovery characteristic curves of Cu2 alloy a and Cu3 alloy b under the pre-strain of 10%. The red arrow line represents recovery strain after being heated to 500 °C for 1 min, and the blue arrow is the strain after being cooled from 500 °C to room temperature

References

[1]	J. Van Humbeeck, J. Eng. Mater. Technol. 121, 98(1999)
[2]	K. Otsuka, X.B. Ren, Intermetallics 7, 511 (1999)
[3]	C.L. Tan, J.X. Jiang, X. An, H.J. Ge, B. Zhao, J. Alloy. Compd. 509, 7549(2011)
[4]	D. Golberg, Y. Xu, Y. Murakami, S. Morito, K. Otsuka, Scr. Metall. Mater. 30, 1349(1994)
[5]	D. Golberg, Y. Xu, Y. Murakami, Mater. Lett. 22, 241(1995)
[6]	K.V. Ramaiah, C.N. Saikrishna, Mater. Des. 56, 78(2014)
[7]	P.J.S. Acta Mater. 57, 1068(2009)
[8]	Y.Q. Ma, C.B. Jiang, Y. Li, H.B. Xu, C.P. Wang, X.J. Liu, Acta Mater. 55, 1533(2007)
[9]	H.B. Xu, Y.Q. Ma, C.B. Jiang, Appl. Phys. Lett. 82, 3206(2003)
[10]	S.Y. Yang, Y.Q. Ma, H.F. Jiang, X.J. Liu, Intermetallics 19, 225 (2011)
[11]	Y.Q. Ma, S.L. Lai, S.Y. Yang, Y. Luo, C.P. Wang, X.J. Liu, Trans. Nonferrous Met. Soc. China 21, 96 (2011)
[12]	Y. Xin, Y. Li, L. Chai, H.B. Xu, Scr. Mater. 57, 599(2007)
[13]	S.N. Saud, E. Hamzah, T. Abubakar, H.R. J. Alloy. Compd. 612, 471(2014)
[14]	V. Recarte, J.I. Mater. Sci. Eng. A 370, 488 (2004)
[15]	N. Zárubová, J. Gemperlová, V. G?rtnerová, A. Gemperle, Mater. Sci. Eng. A 481-482, 457(2008)
[16]	A. Amini, H. Beladi, N. Hameed, F. Will, J. Alloy. Compd. 545, 222(2012)
[17]	S. Miyazaki, T. Kawai, K. Otsuka, J. Le, De Phys. Colloques 43(C4), 813 (1982)Google Scholar
[18]	S.K. Vajpai, R.K. Dube, S. Sangal, Mater. Sci. Eng. A 570, 32 (2013)
[19]	S.N. Saud, E. Hamzah, T. Abubakar, M.K. Ibrahim, A. Bahador, Appl. Phys. A 117, 767 (2014)
[20]	S.N. Saud, B. Abu, A. Tuty, E. Hamzah, M.K. Ibrahim, A. Bahador, Metall. Mater. Trans. A 46A, 3528 (2015)
[21]	C.A. Canbay, Z.K. Genc, M. Sekerci, Appl. Phys. A 115, 371 (2014)
[22]	X. Zhang, J.H. Sui, X.H. Zheng, Z.Y. Yang, X.H. Tian, W. Cai, J. Alloy. Compd. 557, 60(2013)
[23]	X. Zhang, J.H. Sui, X.H. Zheng, Z.Y. Yang, W. Cai, Mater. Sci. Eng. A 597, 178 (2014)
[24]	A.L. Liu, W. Cai, Z.Y. Gao, L.C. Zhao, Mater. Sci. Eng. A 438, 634 (2006)
[25]	U. Sari, I. Aksoy, J. Alloy. Compd. 417, 138(2006)
[26]	V. Recarte, R.B. Metall. Mater. Trans. A 33, 2581 (2002)
[27]	U. Sari, T. Kirindi, Mater. Charact. 59, 920(2008)
[28]	Y.Y. Li, J.M. Wang, C.B. Jiang, Mater. Sci. Eng. A 528, 6907 (2011)
[29]	S.K. Vajpai, P.K. Dube, P. Chatterjee, S. Sangal, Metall. Mater. Trans. A 43, 2484 (2012)
[30]	H. Scherngell, A.C. Kneissl, Acta Mater. 50, 327(2002)