放电等离子烧结非晶Fe_(60)(NbTiTa)_(40)颗粒增强铁基复合材料的组织与力学性能  

Microstructure and properties of amorphous Fe_(60)(NbTiTa)_(40) particulate reinforced iron-based matrix composites fabricated by spark plasma sintering

作　　者：唐翠勇[1] 肖志瑜[2] 罗飞[2] 庄哲峰[1] 陈学永[1] 张翔[1] 

机构地区：[1]福建农林大学机电工程学院,福州350002 [2]华南理工大学机械与汽车工程学院,广州510640

出　　处：《粉末冶金材料科学与工程》2015年第6期971-977,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：福建省自然科学基金资助项目(2014J05056);福建省教育厅科技项目(JA13119);高水平大学建设立项(612014049);福建农林大学青年教师科研基金资助项目(2013xjj20)

摘　　要：将Fe_(60)(NbTiTa)_(40)合金粉末与纯铁粉分别进行45 h高能球磨,获得Fe_(60)(NbTiTa)_(40)非晶粉末和粒度约10μm的铁粉,然后通过放电等离子烧结制备Fe_(60)(NbTiTa)_(40)体积分数分别为5%、10%、15%和20%的Fe_(60)(NbTiTa)_(40)颗粒增强铁基复合材料,研究15%Fe_(60)(NbTiTa)_(40)/Fe混合粉末的烧结致密化行为和Fe_(60)(NbTiTa)_(40)非晶粉末含量对材料力学性能的影响。结果表明:Fe_(60)(NbTiTa)_(40)合金粉末经球磨45 h后转变成非晶态,其过冷液相区达到112℃。通过SPS可实现混合粉末的快速致密成形,增强颗粒含量对复合材料的密度影响不大,材料的致密度在97.5%左右。非晶合金粉末的加入可细化基体相的显微组织,并且随Fe_(60)(NbTiTa)_(40)颗粒含量增加,基体相变得更细小和更均匀,复合材料的硬度和强度均显著增大。20%Fe_(60)(NbTiTa)_(40)/Fe材料的显微硬度为232 HV,屈服强度和极限压缩强度分别为650 MPa和743 MPa。Fe60（NbTiTa）40 alloy powder and pure iron powder were respectvely milled in a high-energy planetary ball mill for 45 h to obtain amorphous Fe60（NbTiTa）40 alloy powder and Fe powder with 10μm. The mixed powders with different volume fractions （5%. 10%. 15% and 20%） of amorphous Fe60（NbTiTa）40 alloy powders were then consolidated into amorphous particle reinforced bulk iron-based matrix composites by spark plasma sintering. The densification behaviors of 15% Fe60（NbTiTa）40/Fe mixtures and the effects of Fe60（NbTiTa）40 content on the microstructures and mechanical properties of the iron-based composites materials were investigated. The results show that the initial Fe60（NbTiTa）40 powder are transformed into amorphous structure after milling for 45 h. The amorphous powders exhibit a broad supercooled liquid region of 112 ℃. The mixed powders can achieve rapid densification during SPS, and the relative density of the fabricated composites reaches about 97.5%. The microstructure can be refined by adding amorphous alloy powders. With increasing Fe60（NbTiTa ）40 content, finer and more uniform microstructure can be obtained, resulting in the increase of microhardness and compressive strength of composites obviously. When the content of Fe60（NbTiTa）40 amorphous powders increases to 20%, the composite exhibits a microhardness of 232 HV, a yield strength of 650 MPa and ultimate compressive strength of 743 MPa.

关 键 词：放电等离子烧结 铁基复合材料 非晶合金 颗粒增强 力学性能 

分 类 号：TF124[冶金工程—粉末冶金]