18K黄金手镯高弹性原因分析

High-Elasticity Analysis of 18-Karat Gold Bracelet

为研究18K黄金手镯高弹性行为,采用弹性模量测试和微观组织观察等方法对样品进行分析。结果表明,合金中存在4种相,其中3种相AuCu、AuCu_3和Au3Cu为基体无序相(Au,Cu)原子有序化后的结果,有序相的含量达到70%。有序相的大量存在可能是合金弹性模量较高的一个原因。手镯表面与截面呈现不同的弹性模量,每种相存在着一定方向的织构,可能是影响手镯弹性模量各向异性的原因。

The high-elasticity of 18-karat gold bracelet has been tested by means of measuring the elasticity modulus and microstructure. It is shown that there are four phases, AuCu, AuCu3 and Au3Cu and （Au,Cu）, in 18-karat gold. AuCu, AuCu3 and Au3Cu are ordered phases produced from the disordered （Au,Cu） phase through the transformation from a disorder to an order state as the temperature declines. The content of the ordered phases is up to 70%, which is a possible reason of high-elasticity. In addition, the elasticity modules of the surface and longitudinal section are different, and each phase has certain texture in the alloy, leading to the anisotropy of elasticity modulus.