镍元素对18K金固溶强化的影响

Effect of Ni content on strengthening solid solution of 18 carat gold alloy

采用氧气乙炔火枪制备了4种镍质量分数分别为0,2.5,5,8%的18K金合金;利用显微硬度仪和X射线衍射仪研究了镍质量分数对18K金固溶强化的影响。其研究结果表明:随着镍质量分数的增加,合金的硬度不断增加;这主要是由于镍质量分数的增加提高了合金的固溶度,加强了固溶强化机制。此外,镍元素对金的固溶强化效果要强于其他补口元素,这也是合金硬度提高的原因。

Four kinds of 18 K gold alloys containing 0,2. 5,5 and 8 % Ni respectively were prepared using oxygen acetylene gun. The effect of Ni content on strengthening the solid solution of 18 carat gold alloys was investigated using by micro-hardness tester and X-ray diffractometer. Results show that the hardness of the alloys was increased with the Ni content; the increase of Ni content improved the solid solubility of the alloy,resulting in an enhanced solid solution strengthening mechanism. In addition,the solid solution strengthening effect of Ni content on Au is stronger than other mending elements,which is the another explanation of the increased hardness.