Mn对喷射沉积Al-25Si-xFe-yMn合金中Fe相的影响

Effect of Mn on Fe phases in spray-deposited Al-25Si-xFe-yMn alloys

摘要: 通过喷射沉积工艺制备了Al-25Si-xFe-yMn(Mn/Fe质量比在0～1之间)系列合金的沉积坯,利用SEM、XRD和EDX对这些沉积坯的微观组织进行分析.结果表明,添加Mn元素,将生成颗粒状的α-Al₁₅(Fe,Mn)₃Si₂,取代了针状的δ-Al₄FeSi₂和β-Al₅FeSi相,从而显著地改善高硅铝合金中的Fe相的形貌,并且随着Mn/Fe质量比的提高,沉积坯中颗粒状的α-Al₁₅(Fe,Mn)₃Si₂含量也增加,而针状相的含量却减少,当Mn/Fe质量比增加到0.83或1时,在沉积坯中只发现颗粒状的α-Al₁₅(Fe,Mn)₃Si₂.

Abstract: Al-25Si-xFe-yMn alloys with the mass ratio of Mn to Fe between 0 and 1 were synthesized by spray deposition.The microstructure of the spray-deposited preforms was investigated by SEM,XRD and EDX.The results indicated that Mn addition could improve the morphology of Fe phases through forming particulate α-Al₁₅ (Fe,Mn)₃Si₂ phase to replace acicular δ-Al₄FeSi₂ and β-Al₅FeSi phases.When the mass ratio of Mn to Fe increased,the amount of particulate α-Al₁₅ (Fe,Mn)₃Si₂ phase would increase,whereas the amount of acicular phases reduced.When the mass ratio of Mn to Fe increased to 0.83 or 1,only particulate α-Al₁₅ (Fe,Mn)₃Si₂ phase could be observed in the deposited preform.