Material and optical study of aluminum and copper decorative alloys prepared by control of grain size

研究了JIS A1070、JIS A5020铝合金和铜-3%Al合金的光学性能与表面形貌和晶体取向的关系，并对粗晶铜合金的装饰性能进行了比较。结果表明：(1)JIS A1070铝合金的晶体腐蚀表面分为两类：一类是表面光滑、规则反射率高的晶体；(2)A型晶体有(310)或(100)面，所有B型晶体都有(110)面。(3)波状夹具的长度方向基本上平行于B型晶体的<lt；100</sup>方向。(4)由于B型晶体有一个适当分散的方向(<lt；对于Cu3%Al合金：(5)晶体的腐蚀表面被归类为…再分为四种类型：一种(A型)是表面光滑的晶体；第二种(B1型)是具有条纹图案的晶体；第三种(B2型)是表面参差不齐的晶体，如波纹状；最后一种(C型)是长方体不均匀的晶体。(6)B1型晶体的条纹是由晶面和蚀刻面的交点形成的。从这些结果来看，对于装饰合金来说，重要的是使具有条纹图案的晶面有适当的分散方向，以显示多种反射。因此，经适当的冷加工和热处理制备的由随机取向的晶体组成的合金板是适合作为内饰材料的。此外，腐蚀剂对刻蚀表面的控制将能够产生呈现复杂反射的多种形貌的晶体表面。这些工艺的适当结合可以生产出良好的装饰材料。特别是，铜铝和铜锌(马鲁莫黄铜[0！R])合金有望成为体现西方生活方式的工艺品或室内产品的新材料。较少

We investigate the relationship between the optical properties to surface morphology and crystal orientations of JIS A1070- and JIS A5020-aluminum alloys, and Cu-3%Al alloys, and then compared the decorative property of Cu alloys having coarsened grains.The following results were obtained as follows.Concerning JIS A1070 aluminum alloys :(1) The etched surface of crystals are classified into two types : one (type A) is the crystal which has smooth surface and shows high regular reflectance ; the other one (type B) is the crystal which has jagged surface such as a wavy pattern.(2) Type A crystals have the (310) or (100) plane and all of type B have the (110) plane.(3) The longish direction of wavy jag is virtually parallel to the <100> direction of type B crystal.(4) Since type B crystals have a properly dispersed direction (<80 degree), the brilliancy of each type B crystal can be shown by a multiform reflection.Concerning to Cu-3%Al alloys :(5) Etched surface of crystals are classified … More into four types : one (type A) is the crystal which has smooth surface ; the second one (type B1) is the crystal having stripe pattern ; the third one (type B2) is the crystal which has jagged surface such as a wavy pattern ; and last one (type C) is the crystal having cuboid unevenness.(6) The stripe pattern of type B1 crystal is created as intersection of crystal plane and etched plane.From these results, it is important for a decorative alloy to have a properly dispersed direction of crystal plane having stripe patterns with a view to showing a multiform reflection. Accordingly, the alloy plates composed of random oriented crystals prepared by proper cold working and heat treatment are found to be suitable for interior materials. Furthermore, the control of etched surface by etchant will be able to create the multiform morphology of crystal surface showing complex reflection. A proper combination of these processes can produce a good decorative material. Especially, Cu-Al and Cu-Zn (Marumo Brass 【〇!R】) alloys can be expected as new materials for crafts or interior products embodying western life style. Less