球磨Mg-Ni非晶在热处理过程中的相转变规律

采用差热分析仪（DTA）、带高温附件的X-射线衍射仪（XRD）等研究了球磨Mg-Ni样品的组织结构、热稳定性能及其在加热过程中的相转变规律。结果表明，经400r／min球磨40h后，样品由非晶体组成，其热稳定性能随着对磨过程传递到样品中能量的增加而降低。当球磨Mg-Ni非晶样品的能量较低时，其DTA曲线上只出现一个放热峰，在该温度加热时将发生晶化反应生成Mg2Ni和MgNi2相；当样品的能量较高时则出现两个放热峰，在其对应的初始温度之间加热时则逐步晶化生成Mg2Ni相，在第二个放热峰加热时，样品中的非晶体转变成MgNi2晶体相。

Phase Transformation of As-milled Mg-Ni Amorphous During Heat Treatment

The structural characteristics,thermal stability and phase transformation of the as-milled Mg-Ni specimens were investigated by means of differential thermal analysis(DTA) and X-ray diffraction with high temperature accessory(XRD).The results show that the amorphous structure can be obtained in the alloy after ball milling for 40h at 400r/min,the thermal stabilities of the amorphous would be reduced with the increase of the energy transferring to the samples during the ball milling.When the energy of the milled Mg-Ni sample is not high enough,the DTA curves of the amorphous specimens consists of only one exothermic peak corresponds to the crystallization into Mg_2Ni and MgNi_2 phases.On the other hand,when the energy is high enough,the DTA curves of the samples consists of two exothermic peaks,and the first one corresponds to the crystallization into Mg_2Ni phase,and the second exothermic peak corresponds to MgNi_2 phase.