深拉伸用钢:第一部分
非铁合金的热机械处理(TMT):第一部分
DataPLUS 模块提供上万种金属材料和非金属材料的腐蚀数据、焊接性能、尺寸与公差信息以及涂层信息。 点击这里了解更多。
Overview of Total Materia database 2022 年 1月 12日
Overview of Total Materia database 2022 年 1月 13日
在使用Total Materia几个月之后,以及深刻体验过所有潜在功能之后,我非常感谢你们的卓越工作和持续稳定的升级服务。 Total Materia始终是用来达成这一目的唯一工具。
M. Manfredini Bonfiglioli Industrial Gearmotors 博洛尼亚, 意大利
我们的目标很简单,就是让 Total Materia成为全球工程师在材料领域的首选一站式解决方案
Prof. Dr. Viktor Pocajt, CEOKey to Metals AG
Spangold alloys are a relatively recent discovery and find their place as an exciting progression with regards to their aesthetic characteristics, particularly in the jewelry manufacturing sector. The effect is generated by inducing a surface martensitic-type phase transformation to take place, thus dispersing light to cause a pleasing aesthetic effect.
Most gold alloys in current commercial use contain additions of copper, silver and zinc. Spangold is a family of specially shaped memory-effect alloys in 18 and 23 carat gold that, on heat treatment, give rise to a multicolored spangled surface which is shown to produce the best aesthetic effect on large flat or curved surfaces.
This spangle arises from a rumpling of the surface caused by a change in crystal structure, but the effect is due to more than a simple surface reaction. It goes throughout the bulk alloy and is a reversible effect. Available in yellow and pink shades in both wrought and cast forms, it offers an exciting new effect that cannot be simulated by conventional treatments to the jewelry surface.
Figure 1 shows a highly magnified picture of the effect—an array of needle-shaped surface rumples that give the spangle effect. As a relatively new finding, this kind of material is only now being taken up by designers and manufacturers, albeit in a limited way.
Spangold is a β-phase alloy with a nominal stoichiometry of Au7Cu5Al4 and a nominal composition of 76% Au, 18% Cu, 6% Al by mass. Au7Cu5Al4 alloy is a decoration alloy, which shows fine surface corrugation at room temperature, hence its name, "Spangold".
The texture is caused by inducing a martensitic-type phase transformation to take place within a sample with a polished surface. Transformations of this type are characterized by considerable crystallographic shear and deformation, which causes a previously flat surface to become faceted. The facets then disperse incident light to cause a pleasing aesthetic effect (Figure 2).
Spangold is offset against conventional 18 carat gold, as well as a variety of other finishes such as red-ivory wood, rhodium-plating and precious stones. The vivid and stark contrast of the Spangold finish is an eloquent testimony to the attractiveness of these gold alloys.
The characterization of suitable transformation features led to the successful development of prototype Spangold alloys. In addition to exploiting their novel finish, the use of the prototype Spangold alloys in jewelry also realizes the practical application of structural gold base compounds.
Apart from their decorative qualities, the Spangold alloys based on intermetallic com- pounds can exhibit a number of other salient features pertinent to their application in jewelry. These include density, luster, castabilty, and wear-resistance. These gold compounds possess a wide and novel range of properties and are likely to enjoy continued interest.
Date Published: Jul-2013
输入搜索词:
搜索项
全文 关键字
标题 摘要
The Total Materia database contains a large number of metallography images across a large range of countries and standards.
Using the specifically designed Metallography tab in the menu bar, you can select the material of interest to you from the list of materials with metallography data included.
Metallography data can also be found through our standard quick search and will show relevant data is available through the standard Subgroup page for the material of interest.
Simply enter your material designation in to the "Material" field and select the standard of interest if known, then click "Search".
General information on microstructure can be found along with the relevant chemical composition for the material of interest.
Where available, a series of images will be provided showing a range of structural detail at various levels of magnification.
It is also possible to select different condition options from the "Select condition" drop-down to show metallography images under different process and heat treatment states.
For you’re a chance to take a test drive of the Total Materia database, we invite you to join a community of over 150,000 registered users through the Total Materia Free Demo.