抗自然时效软化银饰品材料的研究

Study of the Resistance to Natural Aging and Softening of Ornamental Silver

研究了含约 0 .12 % (质量分数 ,下同 )镧和钇的银合金饰品材料的硬度随变形量、温度及淬火时效工艺的变化规律 ,并用电子探针对银饰品材料进行扫描分析。发现微量稀土加入银中可以提高材料的硬度和抗回复软化能力 ,经过低温形变热处理工艺加工的稀土银饰品材料显示了更好的效果 ,可充分发挥材料的潜力。通过电子探针扫描分析发现 ,微量稀土显著地细化了银合金的晶粒 ,微量稀土以固溶或化合物形式分布在合金中 ,有效地延缓了合金的回复和再结晶的进行 。

In order to improve the resistance to natural aging and softening, and property stability of ornamental silver, the dependences of mechanical properties of the silver alloyed with 0 12 wt%(La+Y) on aging temperature have been studied. The experimental results show that the hardness and resistance to softening of Ag can be improved by the addition of small amounts of rare earth elements. SEM analysis indicate that significant grain refinement result. The rare earth additions effectively defer the recovery and recrystallization of silver, thereby improving the resistance to natural aging and softening, and increasing the repeatablility of property.