预退火对纳米晶Fe_(86)Zr_7B_6Cu_1合金显微组织和软磁性能的影响

Effect of pre-annealing on microstructures and soft magnetic properties of nanocrystalline Fe_(86)Zr_7B_6Cu_1 alloy

研究在常规退火前的高温短时间预退火对非晶Fe86Zr7B6Cu1合金晶化过程的影响,通过分析温度对形核速率和晶粒长大速率的影响规律,讨论预退火对非晶Fe86Zr7B6Cu1合金晶化过程的影响机制。结果表明,合适的预退火引起纳米晶Fe86Zr7B6Cu1合金中结晶α-Fe相的晶粒尺寸的减小和体积分数的增加。非晶Fe86Zr7B6Cu1合金经600℃退火1 h后的结晶α-Fe相的晶粒尺寸和体积分数分别为13.2 nm和65.2%,而在750℃保温2 min再在600℃退火1 h后的结晶α-Fe相的晶粒尺寸和体积分数分别为9.5 nm和72.4%。在750℃保温2 min再在600℃退火1 h后的试样比常规退火得到的试样具有更为优良的软磁性能。

The effect of pre-annealing at higher temperature for short duration before conventional annealing at 600 ℃ for 1 h on the crystallization process of amorphous Fe86Zr7B6Cu1 alloy was studied. The affecting mechanism of pre-armealing on the crystallization process of amorphous Fe86Zr7B6Cu1 alloy is discussed by analyzing the temperature dependence of the nucleation rate and the grain growth rate. R is shown that proper pre-annealing leads to the decrease of the grain size and the increase of the volume fraction of crystalline a-Fe in nanocrystalline Fe86Zr7B6Cu1 alloy. BCC a-Fe with grain size of 9.5 nm and volume fraction of 72.4% is formed in ribbon after it has been pre-armealed at 750 ℃ for 2 rain followed by conventional annealing at 600 ℃for 1 h. The grain size and volume fraction of crystalline a-Fe in ribbon annealed at 600 ℃ for 1 h are 13.2 nm and 65.2%, respectively. Complex permeability spectra show that pre-armealing at 750 ℃ for 2 rain before conventional annealing at 600℃ for 1 h results in a distinct improvement of soft magnetic properties.