308 Al-Mg-Si 系合金の曲げ加工性

概要

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Aluminum alloy sheets are attracting attention since they lighten an automobile body. Among them, some Al-Mg-Si alloys have already been applied practically to a part of automobile bodies because these alloys have hardenability during paint baking and do not cause a stretcher strain pattern. However, their bendability is significantly poor compared to that of steels. Therefore, in this paper, close microstructural observation has been made on the side surface as well as tension surface, in order to clarify the influence of the difference in composition of 9 kinds of Ai-Mg-Si alloys, i.e., amount of Mg_2Si, amount of excess Si, Cu addition, etc. Special care has been taken to the occurrence of the crack and unevenness. As a result, cracks were found to be prone to form when the amount of Mg_2Si or excess Si increased, although the increase in the amount of alloying element, particularly Cu, caused grain refinement.
一般社団法人日本機械学会の論文
2003-09-19