アルミニウム合金の半凝固接合プロセス

概要

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The semi-solid joining process of aluminum alloy was investigated. Hyper eutectic Al-25 mass% Si alloy was melted in an electric furnace. The melt was stirred with a ceramic stirrer while cooling. The stirrer was then changed to an aluminum insert (A2017) and stirring was continued for the duration of the semi-solid temperature region. After solidification, specimens were quenched into water and sectioned for analysis of macro- and micro-structures along the weld region. The area ratio of un-bonded, melt-down and normal bonded area were measured. Effects of insertion temperature, rotation time, rotation speed, and surface conditions of specimen on bonded area ratio were reviewed. EPMA line analysis data and calculated concentration of copper were also studied, and the influence of rotation conditions on shear strength was investigated. The research shows that cast-in aluminum alloy materials can be obtained by optimizing the surface conditions of insert material, stirring temperature, and time of semi-solid processing.
Japan Foundry Engineering Societyの論文