·1032 北京科技大学学报 第35卷 (a)800 (b)800 600 x=0 600 x=4 400 400 200 200 4--.6--8 10 2-4.-6 10 应变/% 应变/% (c)800 600 x=6 400 200 2 4 -6 8 10 应变/% 图5Ni56Mn25-xFerGa1g合金压缩至预应变10%的应力-应变曲线.(a)x=0:(b)x=4:(c)x=6 Fig.5 Strain-stress curves of Nis6Mn25-zFexGa19 alloys at the prestrain of 10%:(a)=0;(b)=4;(c)r=6 (a) b)70 -=0 ·=4 65 -4-x=6 60 55 3 以50 45 2 40 1 35 30 8 10 10 预应变/% 预应变/% 图6Ni56Mn25-rFer Ga1g合金压缩至不同预应变时的形状记忆回复应变(a)和回复率(b) Fig.6 Shape memory strain (a)and recovery ratio (b)of Nis6Mn25-zFez Gaig alloys at different prestrains 参考文献 field-induced strain by twin-boundary motion in ferromag- netic Ni-Mn-Ga.Appl Phys Lett,2000,77(6):886 [1]Firstov G S,Van Humbeeck J,Koval Y N.High- 5]Sozinov A,Likhachev A,Lanska N,et al.Giant magnetic- temperature shape memory alloys:some recent develop- field-induced strain in NiMnGa seven-layered martensitic ments.Mater Sci Eng A,2004,378(1/2):2 phase.Appl Phys Lett,2002,80(10):1746 [2]Atli K C,Karaman I,Noebe R D.Work output of the (6]Chmielus M,Zhang XX,Witherspoon C,et al.Giant two-way shape memory effect in Tis0.5Ni24.5Pd25 high- magnetic-field-induced strains in polycrystalline Ni-Mn- temperature shape memory alloy.Scripta Mater,2011, Ga foams.Nat Mater,2009,8(11):863 65(10):903 [7]Chernenko V A,Cesari E,Kokorin VV,et al.Devel- [3]Ma Y Q,Jiang C B.Li Y,et al.Study of opment of new ferromagnetic shape memory alloys in Ni- Niso+Mn25Ga25-(x=2-11)as high-temperature Mn-Ga system.Scripta Metall Mater,1995,33(8):1239 shape-memory alloys.Acta Mater;2007,55(5):1533 [8]Jiang C B,Feng G,Gong S K,et al.Effect of Ni excess [4 Murray S J,Marioni M,Allen S M,et al.6%magnetic- on phase transformation temperatures of NiMnGa alloys.· 1032 · 北 京 科 技 大 学 学 报 第 35 卷 图 5 Ni56Mn25−xFexGa19 合金压缩至预应变 10%的应力–应变曲线. (a) x=0；(b) x=4；(c) x=6 Fig.5 Strain-stress curves of Ni56Mn25−xFexGa19 alloys at the prestrain of 10%: (a) x=0; (b) x=4; (c) x=6 图 6 Ni56Mn25−xFexGa19 合金压缩至不同预应变时的形状记忆回复应变 (a) 和回复率 (b) Fig.6 Shape memory strain (a) and recovery ratio (b) of Ni56Mn25−xFexGa19 alloys at different prestrains 参 考 文 献 [1] Firstov G S, Van Humbeeck J, Koval Y N. High￾temperature shape memory alloys: some recent develop￾ments. Mater Sci Eng A, 2004, 378(1/2): 2 [2] Atli K C, Karaman I, Noebe R D. Work output of the two-way shape memory effect in Ti50.5Ni24.5Pd25 high￾temperature shape memory alloy. Scripta Mater, 2011, 65(10): 903 [3] Ma Y Q, Jiang C B, Li Y, et al. Study of Ni50+xMn25Ga25−x (x=2–11) as high-temperature shape-memory alloys. Acta Mater, 2007, 55(5): 1533 [4] Murray S J, Marioni M, Allen S M, et al. 6% magnetic- field-induced strain by twin-boundary motion in ferromag￾netic Ni-Mn-Ga. Appl Phys Lett, 2000, 77(6): 886 [5] Sozinov A, Likhachev A, Lanska N, et al. Giant magnetic- field-induced strain in NiMnGa seven-layered martensitic phase. Appl Phys Lett, 2002, 80(10): 1746 [6] Chmielus M, Zhang X X, Witherspoon C, et al. Giant magnetic-field-induced strains in polycrystalline Ni-Mn￾Ga foams. Nat Mater, 2009, 8(11): 863 [7] Chernenko V A, Cesari E, Kokorin V V, et al. Devel￾opment of new ferromagnetic shape memory alloys in Ni￾Mn-Ga system. Scripta Metall Mater, 1995, 33(8): 1239 [8] Jiang C B, Feng G, Gong S K, et al. Effect of Ni excess on phase transformation temperatures of NiMnGa alloys