高成形合金2013板材の開発および低コスト構造への適用研究

摘要

航空機の機体に使用されているアルミニウム合金は，rn高強度の2000系，7000系合金がはとんどであり，特にrn引張荷重が主で繰り返し荷重を受ける胴体や主翼下面にrnは，破壊靭性や疲労強度の良好な2024合金が多く用いrnられている。%Influences of chemical composition and manufacturing conditions, e. g. solution heat treatment and artificial aging, on the mechanical properties of 2013 alloy were investigated. Furthermore, the structures utilizing the good formability and weldability of 2013 alloy were designed and partly produced experimentally. An increase of copper content was more effective than that of silicon or magnesium for improving the strength. It was concluded that mechanical properties of 2013 alloy were equal to, or better than, those of 2024-T 3 alloy. In addition, it was confirmed that the application of 2013 alloy to the parts which need high formability or good weldability was good for the reduction of manufacturing cost. From these results, 2013 alloy is acceptable as a substitute material for 2024 alloy.