Abstract: A case nitrided aluminum product is produced by contacting an aluminum product with a nitriding agent at a part of a surface thereof at least, and by nitriding the aluminum product at the surface with an ambient gas at a temperature of a melting point of the aluminum product or less while keeping the aforementioned contact. The nitriding agent includes an aluminum powder, and the ambient gas virtually includes a nitrogen gas. The resulting nitriding layer has a depth of 5 micrometers or more, and it exhibits a case hardness of from 250 to 1,200 mHv. Thus, it is possible to form the deep and hard nitriding layer on the aluminum product with ease under the conditions where it has been said to be too difficult to nitride aluminum products. The case nitrided aluminum product can appropriately make sliding parts which require high wear resistance.

Abstract: A hyper-eutectic aluminum-silicon powder containing extremely fine primary crystal silicon, is prepared by atomizing. First, a molten metal of a hyper-eutectic aluminum-silicon alloy containing phosphorus is prepared. This molten metal or melt is atomized with air or an inert gas and quench-solidified. Aluminum-silicon alloy powder containing primary crystal silicon of not more than 10 .mu.m in crystal grain size is obtained. This aluminum-silicon alloy powder contains at least 12 percent by weight and not more than 50 percent by weight of silicon and at least 0.0005 percent by weight and not more than 0.1 percent by weight of phosphorus. When this hyper-eutectic aluminum-silicon alloy powder is employed, it is possible to prepare a consolidate of powder which has improved mechanical properties, and provides a high yield.

Abstract: A solidified amorphous alloy material is produced from a melt of its desired metal material. A melt feeding route is provided with a first-stage quenching zone. The melt is quenched to a predetermined temperature in the first-stage quenching zone. The thus-quenched melt is then introduced into a second-stage quenching and solidification zone, whereby the melt is cooled further and solidified into a solidified material having an amorphous phase.

Abstract: An induction heating apparatus for induction heating a strip metallic sheet material having a given width from one end to the other end of the material in the longitudinal direction while the material is transferred in the longitudinal direction, comprising a high frequency source, a high frequency coil coupled to the high frequency source and including at least one turn winding formed of two coil portions extending along the surface of the material in the lateral direction of the material to exceed the side edges of the material, a first magnetic flux concentrating member provided in the vicinity of one coil portion extending along the one coil portion to exceed the side edges of the material, and a second magnetic flux concentrating member provided in the vicinity of the other coil portion provided locally in the vicinity of the side edges of the material, whereby heating distribution is adapted to be made uniform throughout the width of the material.