(1. 太原理工大學 材料科學與工程學院，太原 030024；
2. 太原理工大學 教育部新材料界面與工程重點實驗室，太原 030024)
摘 要: 在AZ91鎂合金熔體中添加不同含量的La元素進行精煉實驗，定量地測定在973~993 K下、Al含量為8.0%~9.5%時La元素吸收率的變化。結果表明：當La元素添加量大于0.2%、Al含量大于9%時，La的吸收率穩(wěn)定在(75±5)%；當La含量小于0.2%、Al含量小于9%時，La的吸收率隨La添加量的增加而增大。大量的La元素以Al11La3化合物形式存在于鎂合金基體中形成彌散組織。
關鍵字: AZ91鎂合金；La；吸收率
and its influencing factors
（1. College of Materials Science and Engineering, Taiyuan University of Technology,Taiyuan 030024, China;
2. Key Laboratory of Interface Science and Engineering in Advanced Materials,
Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China）
Abstract:AZ91 magnesium alloy with various additions of La were smelted in vacuum electric furnace. The effects of La addition on the influencing factors of La absorption in AZ91 magnesium alloy were investigated. The variation of La absorption was quantitatively measured under the condition of refining temperature 973−993 K and Al content 8.0%−9.5%. The results show that when the La addition is greater than 0.2% and Al content more than 9%, the absorptivity of La is (75±5)%; when the La addition is less than 0.2% and the Al content is less than 9%, the absorptivity of La increases with increasing La addition. Most of La shows in the form of Al11La3 and distributes dispersively.
Key words: AZ91 Mg alloy; La; absorptivity
