Nano-crystal austenitic metal bulk material having high hardness, high strength and toughness, and method for production thereof
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United States of America Patent
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Issued Date -
Jun 15, 2006
app pub date -
Sep 30, 2003
filing date -
Sep 30, 2002
priority date (Note) -
Abandoned
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Abstract
The invention provides a high hard, strength and tough nano-crystal metal bulk material and a preparation process thereof. The metal bulk material comprises an aggregate of metal nano-crystal grains, wherein an oxide, nitride, carbide, boride or the like of a metal or semimetal exists as a crystal grain growth inhibitor between and/or in the nano-crystal grains. The respective fine powders of nano-metal bulk material-forming components are mechanically alloyed (MA), using a ball mill or the like, thereby preparing nano-metal powders. Then, hot forming-by-sintering treatment such as spark plasma sintering, extrusion and rolling or explosive forming is applied to the powders to obtain a high hard, strength and tough nano-crystal metal bulk material.
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