A Ni-rich TiNi alloy was processed by Equal Channel Angular Extrusion (ECAE) at 500℃. After four passes ECAE treatment, microstructure of the alloy was refined but slightly inhomogeneous, to sub-micron scale, approximately 0.5～0.6 μm. Comparing with the solution-treated TiNi specimen, the martensitic transformations start (M_s) and peak temperatures (M_p) of TiNi specimens processed by ECAE were dramatically lowered. After ECAE treatment, the R-phase transformation was stimulated and separated from martensitic transformation, but occurred within a larger temperature range. Super-elasticity characteristics of TiNi alloy were tested by tensile loading and unloading cycles. The results revealed that at a tensile strain of 6% or smaller, TiNi alloy processed by four passes ECAE showed better super-elasticity, with less residual strain retained, than solution-treated sample. After tensile strain exceeded 6%, up to 8%, the maximum recoverable strain of TiNi alloy ECAE treated was decreased. Microstructure evolution and its effect on phase transformations and super-elasticity characteristics were discussed.
参考文献
| [1] | Miyazaki S;Otsuka K;Wayman C M .[J].Acta Metallurgica,1989,37(07):1873. |
| [2] | Cai W;Murakami Y;Otsuka K .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1999,273-275:186. |
| [3] | Kim J I;Liu Yinong;Miyazaki S .[J].Acta Materialia,2004,52:487. |
| [4] | Waitz T;Kazykhanov V;Karnthaler H P .[J].Acta Materialia,2004,52:137. |
| [5] | Otsuka K;Wayman C M.Shape Memory Materials[M].Cambridge:Cambridge University Press,1998 |
| [6] | Shu T Y.Shape Memory Materials[M].上海:上海交通大学出版社,2000:12. |
| [7] | Li Zhicheng;Zhao Xingke;Zhang Hong et al.[J].Materials Letters,2003,57:1086. |
| [8] | Tsuchiya K;Inuzuka M;Tomus D et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2006,438-440:643. |
| [9] | Hong-Sheng Ding;Jung-Moo Lee;Bup-Ro Lee;Suk-Bong Kang;Tae-Hyun Nam .Effects of subsequent heat treatment on the shape memory behaviors of a Ti/Ni sheet fabricated by bonding and cold rolling of Ti/Ni multilayers[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2007(1/2):265-270. |
| [10] | Zheng Y F;Huang B M;Zhao L C et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2000,279:25. |
| [11] | Pushin VG.;Stolyarov VV.;Valiev RZ.;Kourov NI.;Kuranova NN.;Prokofiev EA.;Yurchenko LI. .Features of structure and phase transformations in shape memory TiNi-based alloys after severe plastic deformation[J].Annales de Chimie-Science des Materiaux,2002(3):77-88. |
| [12] | Pushin V G;Stolyarov V V;Valiev R Z et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2005,410-411:386. |
| [13] | Pushin V G;Valiev R Z;Zhu Y T et al.[J].Materials Science Forum,2006,503-504:539. |
| [14] | Sergueeva AV.;Song C.;Valiev RZ.;Mukherjee AK. .Structure and properties of amorphous and nanocrystalline NiTi prepared by severe plastic deformation and annealing[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):159-165. |
| [15] | Pushin V G;Korolev A V;Kourov N I et al.[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2006,503-504:545. |
| [16] | Li Zhenhua;Cheng Xianhua;Shang Guanqian .[J].Materials Letters,2005,59:705. |
| [17] | Li Zhenhua;Xiang Guoquan;Cheng Xianhua .[J].Mater and Design,2006,27:324. |
| [18] | Fan Zhiguo;Xie Chaoying .[J].Materials Letters,2008,62:800. |
| [19] | Karman I;Karaca H E;Luo Z P et al.[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2003,34:2527. |
| [20] | Kockar B;Karaman I;Kulkarni A;Chumlyakov Y;Kireeva IV .Effect of severe ausforming via equal channel angular extrusion on the shape memory response of a NiTi alloy[J].Journal of Nuclear Materials: Materials Aspects of Fission and Fusion,2007(2/3):298-305. |
| [21] | Xie C Y;Fan Z G .[J].Materials Science Forum,2006,503-504:1013. |
| [22] | Zhou Yumei;Zhang Jian;Fan Genlian et al.[J].ACTA MATERIALIA,2005,53:5365. |
| [23] | Bojda O;Eggeler G;Dlouhy A .[J].Scripta Materialia,2005,53:99. |
| [24] | Nishida M;Wayman C M;Honma T .[J].Metallurgical and Materials Transactions,1986,17A:1505. |
| [25] | Jiang Hong;Fan Zhiguo;Xie Chaoying .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2008,485:409. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%