Laser process for forming dispersion alloy layer from powder on metallic base

A process for forming a dispersion alloy layer on a metallic base, comprising the steps of:

• applying to a metallic base either an alloy powder made of an alloy system, which will separate into two or more multi-liquid phases at a temperature equal to or higher than its melting point and will solidify, when quenched, with its individual liquid phases being separate and in which the ratio of the minimum to the maximum specific weight of the separately solidifying liquid phases is 0.3 or higher, or a mixed powder which can compose said alloy system;
• irradiating the alloy or mixed powder on said metallic base with a laser beam to melt the same, while oscillating said laser beam with a frequency of 10 to 500 Hz in a direction generally perpendicular to a primary relative moving direction to agitate the melt of said alloy or mixed powder on said metallic base;
• and
• moving said laser beam in said primary relative moving direction relative to said metallic base to quench said melt to solidify at a quenching rate of 10.sup.3 deg/sec or higher thereby to form on said metallic base a dispersion alloy layer in which the solid particles of at least one of said phases are dispersed in the matrix of the remaining one of said phases.