ALUMINUM ALLOY HAVING VISIBLE GRAINS AND ALUMINUM ALLOY COLORED BY DOUBLE ANODIZATION

Embodiments relate to a type of aluminum alloy with grains visible to naked eyes. The aluminum alloy may have an average grain size of at least 100 [mu]m. The aluminum alloy can be produced by a process such as casting, extrusion, solutionizing, aging, and etching. The solutionizing causes recrystallization of aluminum and causes grains of the aluminum to grow. Compared with the solutionizing, theaging is performed at lower temperature but enhances strength of the aluminum alloy. The etching makes grain boundaries of the aluminum alloy more prominent, rendering the grains of the aluminum alloy visible to a naked human eye. 实施方案涉及一种具有对肉眼可见的晶粒的铝合金。铝合金可以具有至少100μm的平均晶粒尺寸。铝合金可以通过诸如铸造、挤压、固溶化、老化和蚀刻的工艺来生产。固溶化导致铝的再结晶并导致铝的晶粒生长。与固溶化相比，老化在更低的温度进行，但增强了铝合金的强度。蚀刻使铝合金的晶粒边界更加突出，使铝合金的晶粒对人的肉眼可见。