Method of producing amorphous alloy excellent in flexural strength and impact strength
AssigneeJapan Science and Technology Corporation
InventorsAkihisa Inoue, Tao Zhang, Nobuyuki Nishiyama
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Abstract
A molten alloy was pressure-solidified under a pressure exceeding one atmospheric pressure to eliminate casting defects. The molten alloy was solidified by applying a cooling rate difference to the surface and the interior of the molten alloy to allow a compressive stress layer to remain on the surface of the amorphous alloy ingot and a tensile stress layer in the interior portion. Thus, a amorphous alloy sheet having a thickness of 1 mm or more and excellent in bending strength and impact strength is obtained.
Claims2
A method of producing an amorphous alloy excellent in bending strength and impact strength, the method including the steps of:
- eliminating casting defects by pressure-solidifying molten alloy under a pressure exceeding one atmospheric pressure;
- and
- solidifying the molten alloy by cooling a surface of the molten alloy at a cooling rate approximately 50% larger than a critical cooling rate, which is a lowest cooling rate at which the molten alloy forms an amorphous alloy, then cooling inside of the molten alloy at nearly around the critical cooling rate such that a compressive stress layer remains on the surface of the amorphous alloy and a tensile stress layer in the interior thereof.
Dependencies are inferred from the claim text.