Mn對噴射沉積Al-25Si-xFe-yMn合金中Fe相的影響

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

摘要: 通過噴射沉積工藝制備了Al-25Si-xFe-yMn(Mn/Fe質量比在0～1之間)系列合金的沉積坯,利用SEM、XRD和EDX對這些沉積坯的微觀組織進行分析.結果表明,添加Mn元素,將生成顆粒狀的α-Al₁₅(Fe,Mn)₃Si₂,取代了針狀的δ-Al₄FeSi₂和β-Al₅FeSi相,從而顯著地改善高硅鋁合金中的Fe相的形貌,并且隨著Mn/Fe質量比的提高,沉積坯中顆粒狀的α-Al₁₅(Fe,Mn)₃Si₂含量也增加,而針狀相的含量卻減少,當Mn/Fe質量比增加到0.83或1時,在沉積坯中只發現顆粒狀的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.