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DTIC ADA1003533: A Study of Mechanical Alloying of Metal Powders |
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by Defense Technical Information Center |
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This investigation was undertaken primarily to obtain |
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information concerning the chemical and structural |
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homogeneity of mechanically alloyed powders and to |
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determine under what conditions, if any, true solid |
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solutions may be formed. Four different alloy systems |
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were selected for study: (1) 50 w/o Cr - 50 w/o Mo, (2) |
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Type 316 stainless steel, (3) 20.8 w/o Mn - 79.2 w/o Bi, |
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and (4) a Beta-Ti alloy (Ti-11Cr-8Mn-5Mo-3Al). In both |
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the Cr-Mo system and Type 316 stainless steel system, it |
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was established by x-ray diffraction methods that the |
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elemental components had become interdispersed on an |
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atomic scale as a result of high-energy milling, but that |
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a minimum threshold speed is necessary to obtain a |
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significant degree of alloying. However, annealing |
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studies on the milled powders provided strong indications |
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that the solid solutions formed by mechanical alloying |
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are very inhomogeneous from a chemical and structural |
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point of view. Milling difficulties were encountered with |
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the Beta-Ti and Bi-Mn powder systems which precluded any |
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conclusions pertaining to structural or chemical |
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homogeneity in these systems. In both the Bi-Mn and Beta- |
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Ti systems, the tendency toward cold-welding and/or |
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diffusion bonding of the particles was so pronounced that |
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it was not possible to achieve a proper balance of cold- |
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welding and particle fracturing in order to mechanically |
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alloy component metals. |
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Date Published: 2020-01-24 04:44:06 |
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Identifier: DTIC_ADA1003533 |
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Item Size: 59340151 |
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Language: english |
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Media Type: texts |
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# Topics |
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DTIC Archive; Wassel, T K ; ARMY TAN... |
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