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We have investigated metal­metal joining using “unusual wetting”, in which a liquid metal spreads by capillary action on a porous metal surface layer formed under atmospheric oxidation­reduction. Although oxidation­reduction creates an adequate porous structure for “unusual wetting”, it is difficult to subject only a specific area to atmospheric oxidation­reduction treatment, and region-selective “unusual wetting” and joining are not achieved. In this work, we propose the use of laser, which is able to treat regions selectively, to form a suitable structure for “unusual wetting”. A fine asperity structure was observed on the Cu substrate surface after laser treatment. This structure was termed a “surface fine crevice structure”. The wettability of the laser-treated Cu substrate by liquid Bi was determined to confirm region-selective “unusual wetting” on the “surface fine crevice structure”. We also joined two Cu substrates by “unusual wetting” after creating a “surface fine crevice structure”. [doi:10.2320/matertrans.M2015301]

Metal-Metal Joining by Unusual Wetting on Surface Fine Crevasse Structure Formed by Laser Treatment