镁纳米颗粒烧结过程的分子动力学模拟研究

Molecular dynamics simulation of Mg nanoparticles sintering processes

激光烧结制镁是目前从含镁化合物中提取镁元素的一种重要方法.利用分子动力学模拟来研究纳米颗粒烧结过程和机制,通过在300～900℃范围内在不同温度下烧结的活性纯镁的特性与变形过程的模拟,对添加纯镁粉的烧结生产工艺进行了研究.已知镁熔点为650 K,研究发现在终点温度为650、700、750、800 K时用分子动力学来模拟Mg纳米颗粒的烧结研究达不到模拟的成功率,终点温度为850、900、950和1 000 K时模拟才能成功,在烧结过程中可以产生更高的加热速率,从而有效提高了烧结材料的机械强度.

Laser sintering magnesium is an important method for the extraction of magnesium from magnesium compounds.In this study,molecular dynamics simulations are used to study the sintering process and mechanism of nanoparticles.The properties of active magnesium sintered at different temperatures in the range of 300-900℃are simulated with the deformation process.The sintering production process of adding pure magnesium powder is studied.The melting point of magnesium resources is known to be 650 K,in order to ensure the success rate of this study simulation we found that the molecular dynamics simulation was not successful at the following terminal tempatures at 650 K,700 K,750 K and 800 K,the molecular dynamics simulation have got successful from the following terminal temperature at 850 K,900 K,950 K and 1 000 K,It is possible to produce a higher heating rate during the sintering process,thereby effectively improving the mechanical strength of the sintered material.