| Synthesis and Characterization of Nanocrystalline Ni-Ti and Ni-Cr Powders by Mechanical Alloying |
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| 收稿时间： | 1997-03-28 |
Synthesis and Characterization of Nanocrystalline Ni-Ti and Ni-Cr Powders by Mechanical Alloying |
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| Shenqi CHEN,Yanchun ZHOU,Yiyi LI Shouhua HE. Synthesis and Characterization of Nanocrystalline Ni-Ti and Ni-Cr Powders by Mechanical Alloying[J]. Journal of Materials Science & Technology, 1997, 13(2): 86-90 |
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| Authors: | Shenqi CHEN Yanchun ZHOU Yiyi LI Shouhua HE |
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| Affiliation: | Shenqi CHEN,Yanchun ZHOU,Yiyi LI (Institute of Metal Research,Chinese Academy of Sciences,Shenyang,China)Shouhua HE(Chinese Academy of Science,Beijing,China) |
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| Abstract: | Nanocrystalline powders in the Ni-Ti and Ni-Cr systems were prepared by mechanical alloying (MA) of elemental crystalline powders in an inert atmosphere. The microstructure of the mechanically alloyed powders were characterized by XRD and TEM. The ball-milling process results in a drastic decrease of the crystallite size to the nanometer scale. X-ray diffraction analysis reveals that in the Ni-Cr system, no diffraction peaks from NiCr compound were observed even after 20 h of ball milling; while the lattice parameter of Ni increased with the milling time. In the Ni-Ti system, amorphous alloy was formed. Crystalline intermetallic compounds were obtained by post heat treatment of the amorphous alloy.The crystallization temperature of the amorphous NiTi alloy was obtained be DSC measurement. |
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