| 摘要 |
PROBLEM TO BE SOLVED: To enable the control of thickness while forming a reaction layer in the interface between a first metal and a second metal member by allowing the solid second metal member to contact with the molten first metal surface and also, solidifying the molten metal while oscillating the second metal member with the propagation of ultrasonic wave. SOLUTION: As the first metal, e.g. Mg or Mg alloy is used and the solid second metal member e.g. Al alloy, is brought into contact with the molten first metal surface and the molten first metal is solidified while oscillating the second metal member with the propagation of the ultrasonic wave. Further, the interface reaction layer is discovered on the first metal surface by separating the second metal member from the first metal during solidifying. Then, the interface reaction layer formed on the first metal surface can be utilized as the surface hardened layer by suitably selecting the kinds of the first metal and the second metal member. A crucible 6 charging ADC12, is heated in a prescribed condition, and when the molten metal becomes a prescribed temp. after forcibly air-cooling, the tip part of the metal bar 5 of SUS304 is dipped into the molten metal, and the ultrasonic wave oscillation under a prescribed condition is applied to obtain the joined part of both metals.
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