ALUMINUM ALLOY MATERIAL WITH EXCELLENT BENDABILITY AND PROCESS FOR PRODUCING SAME

摘要

Provided is an aluminum alloy material which has excellent bendability and can be bent without roughening the surfaces and which can be produced without requiring the step of straightening. This aluminum alloy material is characterized by being a T4-tempered material of an Al-Cu-Mg-Si alloy that has a composition which contains 1.0-2.5% Cu, 0.5-1.5% Mg, and 0.5-1.5% Si, with the remainder comprising Al and incidental impurities. The aluminum alloy material is further characterized in that the microstructure of the matrix in the inner part thereof comprises recrystallized grains having an average grain diameter of 200 µm or less and that the ratio of the tensile strength to the yield strength (tensile strength/yield strength) as determined through a tensile test of the material is 1.5 or higher.