To enable a highly tough material to be produced at low cost by the presence of such a crystal assembly that nanocrystals are oriented in the identical azimuth in the crystals of an alloy system capable of forming noncrystalline state.
In an alloy system capable of forming noncrystalline state, such an alloy being in noncrystalline state that the composition is deviated from the stoichiometric composition pref. to the extent so as to be easier to form deposits by about 1-5% is treated under heating at a temperature not higher than the crystallization temperature to obtain such an alloy-based nanocrystal assembly that nanocrystals each about 10-60nm in size are oriented in the identical azimuth in crystal grains each 1-10μm in size. A material afforded by the above nanocrystal assembly has a yield strength about 10 times that of a material with crystal grains each 1-2μm in size, and about 30 times that of a material with ordinary crystal grains each 20-40μm in size. This material with nanocrystal assembly is high in stretchability, and is hard to be broken.
KIKUCHI TAKEHIKO
OGAWA KAZUYUKI
MIYAZAKI SHUICHI
MATSUNAGA TAKESHI
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