Er在Al-Mg-Mn-Zr-Er合金中的存在形式与析出特征  

Existing Morphology and Precipitate Characteristics of RE Er in Al-Mg-Zr-Er Alloy

作　　者：王旭东[1] 林双平[2] 汤振雷[3] 聂祚仁[2] 

机构地区：[1]太原理工大学材料科学与工程学院 [2]北京工业大学材料科学与工程学院 [3]北京有色金属研究总院

出　　处：《特种铸造及有色合金》2010年第10期965-968,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2007AA03Z514)

摘　　要：利用扫描电镜、透射电镜等分析测试手段,研究了Er在Al-4.7Mg-0.7Mn-0.1Zr-0.3Er合金铸态、均匀化态以及冷轧板中的存在形式及析出特征。结果表明,Er在非平衡凝固条件下部分固溶到基体α-Al中,大部分形成初生Al3Er相断续或连续分布在晶界上,Er容易与Mn、Fe元素发生偏聚,但是很难形成Er-Mn金属间化合物;固溶的Er在均匀化退火过程中以次生Al3Er相形式析出;而沿晶界分布的Al3Er相在随后的热处理过程中并不发生分解回溶,它们在热轧、冷轧过程中破碎;冷轧板中的次生Al3Er相与基体保持良好的共格、半共格关系,可以成为合金中有效的强化相。Existing morphology and precipitate characteristics of RE Er in as-cast,as-homogenized and cold rolled Al-4.7Mg-0.7Mn-0.1Zr-0.3Er alloy were observed by SEM(scanning electron microscope),TEM(transmission electron microscope).The results show that in non-equilibrium solidification condition,minor Er existed in theα-Al solid solution,while major Er is continuously or die-continuously distributed on the grain boundary in form of primary Al3Er phase.Although Er is likely to segregate with Mn and Fe,it is difficult to generate Er-Mn intermetallic compound.Solid solution Er can be precipitated from the alloy in form of sub-Al3Er phase during homogenization annealing process.In addition,continuous or dis-continuous Al3Er phase distributed on the grain boundary would not be decomposed and resolved in subsequently heat treatment,and they are broken during hot rolled or cold rolled process.The dispersely distributed Al3Er phase in the cold rolled plate exhibits desirable coherent/semi-coherent with the matrix,which could be acted as effective strengthening phase in the alloy.

关 键 词：ER Al-Mg-Mn-Zr-Er合金 AL3ER 

分 类 号：TG146.21[一般工业技术—材料科学与工程]