内氧化Ag-Mg-Ni合金的组织性能研究

摘要

In this study,Ag-Mg-Ni alloy was prepared by adding a trace amount of Mg and Ni to Ag.The purpose was to test the effects of varying Ni content and internal oxidation temperature on the microstructures and properties of the alloy.The experimental results indicate that,with the increase of Ni content,the Ag-Mg alloy shows little change in electrical resistivity and strength and a salient increase of plasticity.When the Ni content exceeds a certain limit,the properties of the alloy will be unstable.The reason is that the refined Ni grains dispersed among the alloy grains slow down the diffusion of O element,decrease the quantity of MgO particles and optimize their distribution.With the rise of internal oxidation temperature,there is an increase of the alloy plasticity and decrease of its strength.This is due to the aggregation and growth of MgO.%通过向Ag中添加微量Mg、Ni形成Ag-Mg-Ni合金,研究不同Ni含量及内氧化温度对合金组织和力学性能的影响.实验结果表明：对于Ag-Mg合金,Ni元素的添加随着Ni元素含量的增加,合金电阻率和强度变化不大,塑性得到显著提高;当Ni元素含量超过一定程度时,合金的性能变得不稳定.这主要是由于分散存在于合金的晶内和晶界Ni粒子细化晶粒,减缓O元素的扩散速率,降低MgO粒子的数量,并优化其分布.对于内氧化温度,随内氧化温度的提高,有利于提高合金的塑性,降低合金的强度.这主要由于氧化镁粒子聚集长大造成.