压力及稀释剂对块体纳米晶Fe_3Al组织和性能的影响  

Effects of Pressure and Attenuant on Microstructure and Mechanical Properties of Bulk Nano-crystalline Fe_3Al

作　　者：喇培清[1] 刘雪梅[1] 卢学峰[1] 杨洋[1] 王利[1] 陈经民[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料国家重点试验室

出　　处：《特种铸造及有色合金》2011年第8期691-695,共5页Special Casting & Nonferrous Alloys

摘　　要：采用透射电镜(TEM)、X射线衍射(XRD)和压缩试验,研究了氩气压力和稀释剂对铝热法制备的块体纳米晶Fe3Al材料组织和性能的影响。结果表明,在氩气压力分别为3、6、9MPa和稀释剂含量分别为0、20%、40%条件下制备的Fe3Al块体材料均为DO3有序结构,晶粒尺寸≤30nm;随氩气压力增加,材料晶粒尺寸无明显变化,但随稀释剂含量增加,材料晶粒尺寸明显减小。屈服强度随压力增加而提高,但与晶粒尺寸间无明显对应关系。当稀释剂含量不同时,材料晶粒尺寸与屈服强度呈反Hall-Petch关系。Effects of argon pressure and attenuant on microstructure and mechanical properties of bulk nano-crystalline Fe3Al prepared by thermit reaction in condition of different pressure of 3,6,9MPa and attenuant contents of 0,20% and 40%were investigated by TEM（transmission electron microscope） and XRD（X-ray diffraction） and compression testing.The results reveal that crystal structure of the bulk Fe3Al materials prepared belongs to DO3 order with the grain size less than 30 nm.Grain size of the prepared materials is almost independent of the argon pressure,however,with increasing in attenuant content,the grain size is greatly decreased.In addition,yield strength of the prepared materials is improved with pressure increase,however,it is absent of the observed function with grain size.With different attenuant content,an anti-Hall-Petch rule is followed between the grain size and the yield strength.

关 键 词：块体纳米晶 铝热法 稀释剂 氩气压力 

分 类 号：TB383.1[一般工业技术—材料科学与工程]