The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 m or less.

An R-T-B based alloy strip containing dendritic crystals including a R.sub.2T.sub.14B phase, wherein on at least one surface, the average value for the widths of the dendritic crystals is no greater than 60 m, and the number of crystal nuclei in the dendritic crystals is at least 500 per 1 mm square area.

An Fe-based amorphous alloy ribbon reduced in iron loss, less deformed, and highly productive in a condition of a magnetic flux density of 1.45 T is provided. One aspect of the present disclosure provides an Fe-based amorphous alloy ribbon having first and second surfaces, and is provided with continuous linear laser irradiation marks on at least the first surface. Each linear laser irradiation mark is formed along a direction orthogonal to a casting direction of the Fe-based amorphous alloy ribbon, and has unevenness on its surface. When the unevenness is evaluated in the casting direction, a height difference HLwidth WA calculated from the height difference HL between a highest point and a lowest point in a thickness direction of the Fe-based amorphous alloy ribbon and the width WA which is a length of the linear irradiation mark on the first surface is 6.0 to 180 m.sup.2.

The invention provides a method of producing an amorphous alloy ribbon, the method including a step of producing an amorphous alloy ribbon by discharging a molten alloy through a rectangular opening of a molten metal nozzle having a molten metal flow channel along which the molten alloy flows, the opening being an end of the molten metal flow channel, onto a surface of a rotating chill roll, in which, among wall surfaces of the molten metal flow channel, a maximum height Rz(t) of a surface t, which is a wall surface parallel to a flow direction of the molten alloy and to a short side direction of the opening, is 10.5 m or less.

A cooling roll includes flow channels piercing a side surface of the cooling roll in a rotation-axis direction. The flow channels are arranged at uniform spacing on two or more concentric circles having a rotation axis of the roll as a center. A manufacturing apparatus of an amorphous alloy strip includes the cooling roll. Thereby, the amorphous alloy strip having a large thickness can be manufactured in industrial scale.

Disclosed is a pipe made of an iron-base material, having a corrosion prevention layer formed on the surface thereof. The corrosion prevention layer includes a ZnSn sprayed coating including Sn in a content of more than 1% by mass and less than 50% by mass and the balance composed of Zn. Alternatively, the corrosion prevention layer includes a ZnSnMg sprayed coating including Sn in a content of more than 1% by mass and less than 50% by mass, Mg in a content of more than 0.01% by mass and less than 5% by mass and the balance composed of Zn. Preferably, the sprayed coating of the corrosion prevention layer includes at least any one of Ti, Co, Ni and P, and the content of each of these elements is more than 0.001% by mass and less than 3% by mass.

A hermetically sealed container is equipped inside thereof with: a melting furnace; a cooling roll for subjecting the molten metal tapped from the melting furnace to primary cooling to form a casting; and a rotatable cooling drum which receives the casting formed by the cooling roll and which subjects the casting to secondary cooling. The cooling drum has: a tubular member elongated in one longitudinal direction and having a receiving opening which is formed to open on one side of the tubular member to receive therein the casting, and a discharge opening which is formed to open on an opposite side of the tubular member to discharge the casting that has been subjected to the secondary cooling; and a transfer means for transferring the casting received from the receiving opening toward the discharge opening in response to the rotation of the tubular member.

An alloy ribbon that is an alloy ribbon containing a metal as a main component, and has a recess on at least one principal surface, in which a depth of the recess is 5% or more and 75% or less of an average thickness.

A lightweight aluminium or magnesium alloy comprises aluminium or magnesium and one or more alloying elements, including dispersoid forming elements increasing the liquidus temperature of the alloy. The alloy is ejected in a molten state from at least one nozzle and is rapidly solidified. The lightweight alloy is produced from at least one lightweight metal based composition that comprises predominantly aluminium or magnesium. This composition is heated, in a first heating step, to a first temperature that is lower than the liquidus temperature of the alloy to produce a melt of the lightweight metal based composition that is supplied through a piping to the nozzle. In the piping, the lightweight alloy melt is heated to have a second temperature that is preferably higher than the liquidus temperature of the alloy. The first temperature reduces the tendency of magnesium to oxidize whilst the second temperature dissolves all of the alloying elements.

A ribbon of elastocaloric material is provided. The ribbon is made from copper alloyed with aluminum and manganese. The ribbon has a length, a width, and a thickness. The length is a longest dimension of the ribbon, and the width is perpendicular to the length. The thickness is perpendicular to both the length and the width, and the thickness is 0.1 mm or less. Further, in a room temperature ambient environment, the ribbon increases in temperature by at least 4 C. upon application of 6% of tensile strain and cools by at least 4 C. when the tensile strain is unloaded.