球磨参数对MgNi非晶热稳定性能的影响

采用带高温附件的X射线衍射仪(XRD)、差热分析仪(DTA)等研究了磨球配比、球料比、球磨速度、球磨时间等参数对MgNi样品的结构、热稳定性能的影响及其在加热过程中的相变规律。结果表明MgNi非晶的热稳定性能随着样品中球磨能量的增加而降低。当样品的球磨能量较低时(球磨时间短、球磨速度低、球料比小、磨球配比中大球质量大而小球数量少),非晶样品只有一个放热峰,对应着Mg2Ni和Mg Ni2晶体相的生成;当样品的球磨能量较高时则出现二个放热峰,分别对应着Mg2Ni、MgNi2晶体相的生成。

The effects of the parameters of ball milling on the thermal stabilities of the as-milled MgNi amorphous

The effects of the parameters of ball milling such as the rate of ball weight, ball to powder weight ratio and the velocity and time of milling on the structural characteristics, thermal stability and phase transformation of the MgNi specimens were investigated by means of X-ray diffraction with high temperature accessory (XRD) and differential thermal analysis (DTA) in this paper. The thermal stabilities of the MgNi amorphous would be reduced with the increasing in the energy of ball milling. When the energy of the as-milled MgNi sample was not high enough (the velocity and time of ball milling was little, ball to powder weight ratio was low, the weight of big balls was higher but the number of small ones was less), the DTA curves of the amorphous specimens consists of only one exothermic peak corresponds to crystallization to Mg_2Ni and MgNi_2 phases. On the other hand, when the energy of ball milling was high enough, the DTA curves of the samples consists of two exothermic peaks which corresponds to crystallization into Mg_2Ni, MgNi_2 phases, respectively.