J. Mater. Sci. Technol. ›› 1997, Vol. 13 ›› Issue (2): 86-90.

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Synthesis and Characterization of Nanocrystalline Ni-Ti and Ni-Cr Powders by Mechanical Alloying

Shenqi CHEN; Yanchun ZHOU;Yiyi LI (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Shouhua HE(Chinese Academy of Science, Beijing 100864, China)   

  • 收稿日期:1997-03-28 修回日期:1997-03-28 出版日期:1997-03-28 发布日期:2009-10-10

Synthesis and Characterization of Nanocrystalline Ni-Ti and Ni-Cr Powders by Mechanical Alloying

Shenqi CHEN; Yanchun ZHOU;Yiyi LI (Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110015, China)Shouhua HE(Chinese Academy of Science, Beijing 100864, China)   

  • Received:1997-03-28 Revised:1997-03-28 Online:1997-03-28 Published:2009-10-10

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摘要： 1.IntroductionNanocrystallinmaterialswithaveragecrystallitesizeintherangofafewnanometers,havebeentheinterestofmanyinVeStigators.Duringthepastseveraly6ars,thepropertiesofthematerialshav-ingphaseorgrainstructuresonacoarsersisescalehavebeenreportedl1].Maptecboques,e.g-,gas-condensationl2j,highenergyreactionndllingandme-chbocalalloyingls],andsol-gelmethodl4l,havebeenusedtosynthesisenanocrystallin....

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.