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Zr48Cu36Ag8Al8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 rmin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AlZr2和AlAg3相.Zn8Cu36Ag8l8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Zr48Cu36Ag8Al8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 effect of annealing temperature on the microstructure evolution of Zr48Cu36Ag8Al8 bulk metallic glass was investigated by X-ray diffraction (XRD),differential scanning calorimetry (DSC) and transmission electron microscopy (TEM).Results show that the as-cast Zr48Cu36Ag8Al8 alloy by rapid solidification exhibits a typical characteristic of an amorphous structure.After annealed at 703 K for 20 min,a homogeneous amorphous matrix is separated into two different glassy phases,namely,phase separation occurs.Because phase separation structure will compete with the amorphous matrix during isothermal annealing,this structure is easily decomposed and transformed into the crystalline phases AlZr2 and AlAg3 with annealing temperature increasing.The microstructure of Zr48Cu36Ag8Al8 bulk metallic glass undergoes the local structure transformation,phase separation and nano-crystallization transformation during heat treatment in the supercooled liquid region,which implies that the rnicrostructure of Zr48Cu36Ag8Al8 bulk metallic glass is sensitive to the annealing temperature.In addition,the formation of phase separation will accelerate the formation ofnano-crystals.
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