Stamper aluminum prototype material, stamper aluminum prototype and stamper

摘要

The present invention contains 0.5 to 3.0% by mass of Mg, the elements other than Mg including inevitable impurities are 500 ppm or less in total, and the component composition consisting of Al as the balance, and the average crystal grain size are The present invention relates to a stamper aluminum prototype material characterized by having a cast structure having a size of 1000 μm or less and an area ratio of second phase particles of 0.10% or less. According to the present application, it is possible to provide a stamper in which aluminum crystal grains are refined, generation of second phase particles is suppressed, unevenness due to mirror polishing is reduced, and a uniform unevenness pattern is formed by anodizing treatment. it can.