利用电弧熔炼及铜模快速铸造的方法制备Zr_(41.2)Ti_(13.8)Cu_(12.5)Ni_(10)Be_(22.5)块体非晶合金,通过高分辨电子显微镜研究过冷液相区和晶化初期晶核的形成、纳米晶粒长大.结果表明,Zr_(41.2)Ti_(13.8)Ni_(10)Cu_(12.5)Be_(22.5)块体非晶合金晶化初期,利用高分辨像能观察到晶格点阵特征条纹.很难区分过冷液相区内微小区域的结构特征,借助高分辨像的傅里叶变换技术很容易地辨别出晶化前与相分离有关的结构变化.纳米晶粒以聚合型和单独晶核两种方式生长.
Zr_(41.2)Ti_(13.8)Ni_(10)Cu_(12.5)Be_(22.5) bulk amorphous alloy was prepared by arc-melting and copper mould rapid casting. The formation of the crystal nucleus in the supercooled liquid region, the nanocrystalline grain growth at initial stages were observed by high resolution transmission electron microscope (HRTEM). It is shown that the crystal lattice stripes can be observed in HRTEM images at initial stages. The structural change of the phase separation in the supercooled liquid region is difficult to identify by HRTEM. The clear structural change can be observed expediently by means of the fast fourier transform technique (FFT) of the HRTEM. The nanocrystalline grain growth pattern is the aggregation growth and the isolation growth.
参考文献
| [1] | Gravier S;Blandin JJ;Donnadieu P .Interactions between high-temperature deformation and crystallization in zirconium-based bulk metallic glasses[J].Philosophical magazine: structure and properties of condensed matter,2008(16):2357-2372. |
| [2] | Olszewski J;Zbroszczyk J;Sobczyk K et al.Thermal stability and crystallization of iron and cobalt--Based bulk amorphous alloys[J].Acta Physica Polonica A,2008,114(06):1659-1666. |
| [3] | Kopcewiez M;Latuch J;Kulik T .Crystallisation and magnetic behaviour of amorphous and nanocrystalline Fe81-x-yNixCoyZr7B12 alloys[J].Physica Status Solidi, A. Applied Research,2007(9):3179-3192. |
| [4] | Nabialek M;Zbroszczyk J;Olszewski J et al.Microstructure and magnetic properties of bulk amorphous and nanocrystalline Fe61Co10Zr2.SHf2.5Nb2W2B20 alloy[J].Journal of Magnetism and Magnetic Materials,2008,320(20):787-791. |
| [5] | M. Vedat Akdeniz;Amdulla O. Mekhrabov .Impurity-Driven Nanocrystallization of Zr-Based Bulk Amorphous Alloys[J].Journal of nanoscience and nanotechnology,2008(2):894-900. |
| [6] | Wang, WM;Niu, YC;Wang, F;Liang, JC;Jin, SF;Zhang, WG;Bian, XF .Electrical resistivity evolution in the annealed amorphous Fe78Si9B13 ribbons[J].Journal of Non-Crystalline Solids,2008(30):3612-3616. |
| [7] | R.D.Conner;R.B.Dandliker;W.L.Johnson .Mechanical properties of tungsten and steel fiber reinforced Zr-41.25Ti_13.75Cu_12.5Ni_10Be_22.5 metallic glass matrix composites[J].Acta materialia,1998(17):6089-6102. |
| [8] | F. Baldwin;N.V. Ravi Kumar;K. Das .Effect of hafnium incorporation on the crystallization and mechanical behavior of a Zr-based bulk amorphous alloy[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2008(1/2):233-242. |
| [9] | M.Iqbal,J.I.Akhter,Haifeng ZHANG,Zhuangqi HU.Crystallization Behaviour and Mechanical Properties of Zr65Cu18Ni9Al8 Bulk Metallic Glass[J].材料科学技术学报(英文版),2007(05):693-696. |
| [10] | Akihiko Hirata;Yoshihiko Hirotsu;T.G. Nieh .Direct imaging of local atomic ordering in a Pd-Ni-P bulk metallic glass using C_s-corrected transmission electron microscopy[J].Ultramicroscopy,2007(2/3):116-123. |
| [11] | Tadakatsu Ohkubo;Takashi Hiroshima .In-situ Electron Diffraction Study of Bulk Amorphous La_(55)Al_(25)Ni_(20) in the Supercooled Liquid Region[J].Materials transactions,2000(11):1385-1391. |
| [12] | Wei S W;Ding B Z;Lei T Q .Crystallization of amorphous Zr65Cu27Al8 alloy with wide supercooled liquid region[J].Materials Letters,1998,37(4/5):263-267. |
| [13] | Hiraga K;Kohmoto O .Microstructure of Fe-Cu-Nb-Si-B soft magnetic alloys studied by transmission electron microscopy[J].Materials Transactions-Japan Institute of Metals,1991,33(09):868-871. |
| [14] | Xing L Q;Eckert J;Loser W et al.Crystallization behaviour and nanocrystalline microstructure evolution of a Zr_(57)Cu_(20)Al_(10)Ni_8Ti_5 bulk amorphous alloy[J].Philosophical Magazine A:Physics of Condensed Matter:Structure,Defects and Mechanical Properties,1999,79(05):1095-1108. |
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