退火时间对FeCuSiBAl纳米晶/非晶复合材料的纳米压痕力学行为的影响

Effect of annealing time on nanoindentation mechanical behaviors of a FeCuSiBAl nanocrystalline/amorphous composite

采用充氩气的电弧熔炼加单辊甩带法制备一种FeCuSiBAl非晶合金,然后在831K下恒温退火,研究退火时间对非晶合金的显微组织与纳米压痕力学行为的影响。结果表明,FeCuSiBAl非晶合金退火时在非晶基体中产生纳米晶,纳米晶化程度随退火时间延长而增加。在60min退火时间内,合金的硬度随退火时间延长而增大,退火时间超过60min后,硬度开始下降。退火以及降低载荷都导致合金的弹性模量增大。

An FeCuSiBAl amorphous alloy was fabricated using arc melting technique plus single-roller melt-spinning method. The effects of annealing time on the microstructures and nanoindentation mechanical behaviors of the amorphous alloys were investigated. The results show that nanocrystals nucleated in the amorphous matrix after the alloy was isothermally annealed at 831 K. The nanocrystallization degree increases with increasing the annealing time. Nanoindentaion testing results indicated that the hardness increases with increasing the annealing time until it reaches 60 minutes, after which the hardness starts to decrease. Both annealing and decreasing the load lead to the increase of the elastic modulus.