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Sm(CoCuFeZr)7.4永磁合金時效過程中矯頑力和顯微組織的變化

  • 摘要: 用磁性測量、透射電鏡、Kerr磁光效應觀測和分析了Sm(CoCuFeZr)7.4合金經固溶處理后,等級時效處理后的磁性、顯微組織結構和疇結構。研究了該合金在600℃~1050℃溫度范圍內恒溫時效過程中矯頑力和顯微結構的變化,某些樣品磁性能達到:
    Br≥11.5KGs,BHc≥5.4KQe,(B.H)m≥30.5MGsQe
    合金在高矯頑力狀態下的顯微組織為胞狀。等級時效過程中第一級時效(830℃3分)就形成了胞狀組織,在隨后降低溫度的時效過程中,雖然矯頑力由2.8KOe提高到5.3KOe,但顯微組織結構基本保持不變,矯頑力的提高與兩相成份差增加有關。在800℃長時間恒溫時效,胞狀組織要破壞,第二相變成片狀,在650℃以下時效600分鐘,bHc隨時效時間線性地變化,并且矯頑力的變化很小,680℃以上恒溫時效矯頑力達到峰值后的降低可能與胞狀結構的破壞有關。隨時效溫度的升高,出現矯頑力峰值的時間縮短。時效過程的擴散激活能為34000卡/克原子度。1050℃沒有時效效應。

     

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