Co_(66)Fe_4V_2Si_8B_(20)金属玻璃的结构弛豫和晶化的研究  

STRUCTURAL RELAXATION AND CRYSTALLIZATION IN THE METALLIC GLASS Co_(66)Fe_4V_2Si_8B_(20)

作　　者：何思明[1] 冯志蓉[1] 

机构地区：[1]四川大学

出　　处：《钢铁研究学报》1989年第1期55-62,共8页Journal of Iron and Steel Research

摘　　要：用倒扭摆、DSC和TEM研究了金属玻璃Co_(66)Fe_4V_2Si_5B_(20)的结构弛豫和晶化过程。在结构弛豫阶段,内耗与温度近似呈指数增加,激活能有一较宽分布。预退火后内耗降低,但在预退火温度以下的降温和升温过程中内耗有回复性,长期等温退火内耗趋近一平衡值。用局域结构单元切变变换模型讨论了内耗的微观机制。在晶化过程中,从500 ℃至650 ℃出现三个内耗峰与DSC分析的三个放热峰对应,内耗峰高与(?)/f,呈线性关系,在峰温附近切变模量发生软化。认为相转变的内耗是在晶化进行时,外加切应力促进或加速接近临界的晶核界面运动所引起的能量损耗。另用TEM观察了非晶微观结构的变化。The structural relaxation and crystallization process in metallic glass Co66Fe4V2Si8B20 were investigated by inverted torsion pendulum, TEM and DSC techniques. It is found that the internal friction increases exponentially with increasing temperature in structural relaxation processes and activation-energies have a wide distribution. The value of internal friction decreases after pre-annealing, but it is recoverable during cooling and heating below annealing temperature. The internal friction asymptotically...

关 键 词：结构弛豫 CO Fe4V2Si8B 金属玻璃 晶化过程 等温退火 能量损耗 激活能 变换模型 晶核 

分 类 号：TF4-55[冶金工程—钢铁冶金]