摘要
采用机械合金化(MA)及热压烧结工艺制备纳米晶Fe3Al块体材料。采用X射线衍射、透射电镜、扫描电镜等对MA粉体及热压块体的相及显微组织进行分析,并对热压块体的力学性能及断口形貌进行了测试分析。结果表明:Fe72Al28混合粉在球磨过程中,Al逐渐溶入Fe中,形成Fe(Al)过饱和固溶体,纳米晶粉体的结构有序度较低。在1200℃,保温1h下真空热压烧结,Fe(Al)转变为有序的DO3-Fe3Al,同时发生晶粒长大。Fe3Al块体晶粒尺寸为40.1nm,相对密度大于96%,维氏硬度626.8 HV,三点弯曲强度985MPa;弯曲断口为脆性断口,但也呈现出一定韧性断裂特征。
Nanocrystalline Fe3Al bulk material was fabricated by mechanical alloying （MA） and subsequent vacuum hot-pressing. Phases and microstructure of the mechanically alloyed powders and hot pressed bulk were analyzed by means of XRD,TEM and SEM. Mechanical properties of the hot pressed Fe3 Al were also investigated. The results show that a supersaturated Fe （Al） solid solution forms by means of the dissolution of Al into Fe during ball milling of the blended Fe and Al elemental powders. The nanocrystalline Fe（Al） powder formed during ball milling has a lower degree of ordering. The Fe（Al） solid solution is transformed into the ordering DO3-Fe3 Al after vacuum hot pressing the MAed powder at 1200 ℃ for lb. The average crystalline size of Fe3Al is 40.1nm. Its relative density is higher than 96% . Vickers-hardness and bending strength of the Fe3Al bulk are 626.8 and 985MPa, respectively. The bending fracture of the hot-pressed Fe3Al is brittle with some ductile fracture characteristics.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2009年第5期127-130,共4页
Transactions of Materials and Heat Treatment
基金
合肥工业大学科技创新基金资助项目(103-037016)
关键词
机械合金化
FE3AL
热压烧结
显微组织
力学性能
mechanical alloying（MA）
Fe3Al
hot-pressing
microstructure
mechanical properties
