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Mechanical milling of gas-atomized Al-Ni-Mm (Mm = misch metal) alloy powders

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Abstract

Al-14Ni-14Mm (Mm = misch metal) alloy powders rapidly solidified by the gas atomization method were subjected to mechanical milling (MM). The microstructure, hardness, and thermal stability of the powders were investigated as a function of milling time using X-ray diffraction (XRD), transmission electron microscopy (TEM), and differential scanning calorimetry (DSC) methods. In the early stages of milling, a cold-welded layer with a fine microstructure formed along the edge of the milled powder (zone A). The interior of the powder remained unworked (zone B), resulting in a two-zone microstructure, reminiscent of the microstructures in rapidly solidified ribbons containing zones A and B. With increasing milling time, the crystallite size decreased gradually reaching a size of about 10 to 15 nm and the lattice strain increased reaching a maximum value of about 0.7 pct for a milling time of 200 hours. The microhardness of the mechanically milled powder was 132 kg/mm2 after milling for 72 hours and it increased to 290 kg/mm2 after milling for 200 hours. This increase in microhardness is attributed to a significant refinement of microstructure, presence of lattice strain, and presence of a mixture of phases in the alloy. Details of the microstructural development as a function of milling time and its effect on the microhardness of the alloy are discussed.

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Authors and Affiliations

  1. the Rapidly Solidified Materials Research Center, Chungnam National University, 305-764, Taejon, South Korea

    Soon-Jik Hong (Graduate Student), Taek-Soo Kim (Postdoctoral Research Fellow) & Byong Sun Chun (Professor and Director)

  2. the Department of Metallurgical and Materials Engineering, Colorado School of Mines, 80401-1887, Golden, CO

    C. Suryanarayana (Research Professor)

Authors
  1. Soon-Jik Hong
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  2. Taek-Soo Kim
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  3. Byong Sun Chun
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  4. C. Suryanarayana
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Hong, SJ., Kim, TS., Chun, B.S. et al. Mechanical milling of gas-atomized Al-Ni-Mm (Mm = misch metal) alloy powders. Metall Mater Trans A 32, 821–829 (2001). https://doi.org/10.1007/s11661-001-0098-6

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  • DOI: https://doi.org/10.1007/s11661-001-0098-6

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