Al-Mg-Si系合金の曲げ加工性(オーガナイズドセッション,材料と組織)

概要

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Aluminum alloys for autobody sheets are attracting attention in terms of the weight reduction of vehicles that will alleviate the global warming probrem. Among them, some Al-Mg-Si alloys have already been applied to a part of autobodies 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, the behavior of cracking caused by bending has been investigated on sheet specimens of five alloys with different Mg_2Si, excess Si and Cu contents in order to clarify the influence of the difference in composition. Special care has been taken to observe the cracked surface by fracturing the specimen into two pieces with the aid of what is called liquid metal embrittlement by gallium. Such observation has never applied since the specimen cannot be separated into two pieces by usual bending procedures. As a result, cracks were found to become deeper when the amount of Mg_2Si or excess Si increased, and they initiated at grain boundaries.
一般社団法人日本機械学会の論文
2004-09-23