银-微量稀土银饰品材料的研究

研究了添加微量稀土(质量分数小于0.07%)银饰品材料的硬度随变形量及温度的变化规律, 用扫描电镜观察了材料的显微组织和第二相分布, 同时对材料的抗硫化性能进行了试验。结果表明, 添加质量分数为0.06%左右的微量稀土能够细化晶粒, 稀土以固溶或球状第二相形式存在, 可以强化合金, 有效地延缓了材料的回复与再结晶, 提高了银饰品材料的抗时效软化能力。其中银钇合金表现了较好的抗硫化物腐蚀的能力。

A Study on Silver-rare Earths Ornamental Materials

Some tests on silver ornamental material are carried out by adding rare earths, less than 0.07%,to investigate the dependence of hardness on the temperature and degree of deformation. Microstructure and second phase distribution of the alloys are observed with a scanning electron microscope. A test on sulphidization corrosion resistance of the alloys is carried out. The results show that addition of a trace of rare earth(about 0.06%) can fine the particles of the silver alloys. The rare earths are distributed in the alloys in the form of solid solution or spherical second phase, thus strengthening the alloys, delaying their recovery and recrystallization and improving the age softening resistance of silver ornamental materials. Ag Y alloys have a better ability to resist sulphidization corrosion.