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通过X射线衍射(XRD)、差示扫描量热法(DSC)和透射电子显微镜(TEM)研究了退火温度对Zr_(48)Cu_(36)Ag_8Al_8金属玻璃微观结构演化的影响。结果表明,快速凝固获得的样品为典型的非晶态结构。当样品在703 K保温20 min时,均一的非晶基体相分离成2种非晶合金,即,发生相分离。由于相分离结构与非晶基体在等温退火过程是竞争的关系,这个结构很容易向晶化态进行转变,形成AlZr_2和AlAg_3相。Zr_(48)Cu_(36)Ag_8Al_8金属玻璃的微观结构在过冷液相区等温退火过程中经历了局部结构转变,相分离以及纳米晶转变,这个过程意味着Zr_(48)Cu_(36)Ag_8Al_8金属玻璃的微观结构对退火温度十分敏感。此外,相分离的形成可以加速纳米晶的形成。
The effects of annealing temperature on the microstructure evolution of Zr48Cu36Cu_8Al_8 metallic glass were investigated by XRD, DSC and TEM. The results show that the sample obtained by rapid solidification is a typical amorphous structure. When the sample is incubated at 703 K for 20 min, the uniform amorphous matrix phase separates into two types of amorphous alloy, that is, phase separation occurs. Due to the competitive relationship between the phase separation structure and the amorphous matrix in the isothermal annealing process, the structure is easily transformed into the crystalline state to form AlZr2 and AlAg3 phases. The microstructure of the Zr_ (48) Cu_ (36) Ag_8Al_8 metallic glass undergone local structural transformation, phase separation and nanocrystalline transformation during the isothermal annealing of the supercooled liquid region. This process implies that the microstructure of the Zr_ (48) Cu_ (36) Ag_8Al_8 The microstructure of metallic glass is very sensitive to annealing temperature. In addition, the formation of phase separation can accelerate the formation of nanocrystals.