快速凝固Al-Fe-V-Si合金微结构Mossbauer谱研究

MICROSTRUCTURAL MOSSBAUER SPECTRUM ANALYSIS OF RAPIDLY SOLIDIFIED Al-Fe-V-Si ALLOYS

用Mossbauer谱研究了快速凝固Al－Fe－V－Si合金的微结构，结果表明，合金中Fe原子存在α－Al（Fe），α－Al（Fe－Fe）替代固溶体及α－Al13（Fe，V）3Si金属间化合物三种组态，高温热曝露状态除4.3％Fe合金（原子分数）α－Al（Fe－Fe）组态消失外，其它合金组态类型不变，但含量发生相对变化，急冷态和退火态α-Al晶格常数随合金中Fe含量增加呈现不同程度的下降趋势，归因于两种状态组分原子Fe，V和Si含量的变化。

By means of Mossbauer spectroscopy analyses, it is indicated that there are three kinds of configurations for Fe atoms corresponding to α-Al(Fe) and α-Al(Fe-Fe) solid solutions and α-Al13(Fe,V)3Si intermetallic compound in liquid-quenched Al-Fe-V-Si alloys. Except for the absence of α-Al(Fe-Fe) configuration in Al93.3Fe4.3V0.7Si1.7 alloy, the other Fe atomic configurations do not change during the annealing at 755 K for 500 h. However,the relative contents of these configurations have changed. The lattice parameters of α-Al matrix decreased with increasing Fe content (4.3, 5.4, 6.4 (atomic fracti0n, %)) for three RS Al-Fe-V-Si alloys in as-cast and heat-treated states. In addition, the possible configurations of V and Si atoms have been discussed by using the results of Mossbauer spectra and matrix lattice parameters.