低温烧结制备超细晶FeAl合金及性能的研究  

Microstructure and properties of ultrafine-crystalline FeAl intermetallics produced by ball milling and low-temperature sintering

作　　者：詹肇麟[1,2] 郭丽娜[1] 李莉[1] 刘安强[1] 

机构地区：[1]昆明理工大学真空冶金国家工程实验室,昆明650093 [2]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《粉末冶金技术》2010年第1期3-6,11,共5页Powder Metallurgy Technology

基　　金：国家自然科学基金项目(50671045);云南省中青年学术技术带头人后备人才基金(2007PY01-05)

摘　　要：Fe、Al混合粉末经高能球磨后,在560～620℃进行低温烧结。结果表明,低温烧结温度对合金组织有明显的影响,经过12h球磨,在620℃烧结4h,可以得到超细晶FeAl金属间化合物。SEM、AFM和XRD的分析结果表明,晶粒均匀,呈等轴状,大小约为30nm左右。超细晶FeAl金属间化合物的显微硬度较低,断裂为韧窝断口,呈现塑性变形特征。Ultrafine-crystalline FeAl intermetallics was produced by high-energy ball-milling, then low-temperature sintering at 560 - 620℃. The microstructure and phases of the FeAl alloy were identified by SEM, AFM and XRD methods, and the mechanical properties were investigated. The results show that nano-sized FeAl alloy is obtained after Fe,AI powders are ball-milled for 12h, then sintered at 620 ℃ for 4h. The microstructure of FeAl alloy exhibits homogeneous and equiaxial grains, with size being about 30nm. The plastic formability of the FeAl phase is enhanced by extending the ball-milled time and raising sintering temperature. The nano-sized FeAl alloy possesses lower micro- hardness and tough fracture, showing plastic deformation characteristic.

关 键 词：FEAL合金 金属间化合物 高能球磨 低温烧结 晶粒细化 

分 类 号：TQ174.758[化学工程—陶瓷工业]