底材对添加不同合金元素的纳米晶Fe_3Al基合金组织和力学性能的影响  

Effect of substrates on microstructures and mechanical properties of bulk nanocrystalline Fe_3Al-based alloy with different alloying elements

作　　者：喇培清[1] 师婷[1] 王鸿鼎[1] 胡苏磊[1] 张丹[1] 卢学峰[1] 魏玉鹏[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实验室,兰州730050

出　　处：《材料科学与工艺》2014年第1期110-117,共8页Materials Science and Technology

基　　金：国家自然科学基金资助项目(51164022)

摘　　要：通过铝热反应法分别在玻璃和铜底材上制备了块体纳米晶Fe3Al、Fe3Al-10Mn、Fe3Al-10Cr合金,研究了不同底材和合金元素对合金显微结构和力学性能的影响.结果表明:玻璃底材上得到Fe3Al-10Mn合金为有序DO3结构,其他均为无序bcc结构;玻璃底材上得到的合金平均晶粒尺寸分别为27 nm、19 nm、23 nm;而铜底材上得到的合金分别为18 nm、15 nm、22 nm;玻璃底材上得到的Fe3Al和Fe3Al-10Mn合金的屈服强度和维氏硬度有所降低,但纯Fe3Al合金的塑性较好,同时玻璃底材上Fe3Al-10Cr合金的维氏硬度和屈服强度分别提高了42.4%和20%,分别为292 HV30和960 MPa;不同合金元素对在玻璃底材上制备的合金塑性影响不大,但屈服强度有所提高.Bulk nanocrystalline Fe3Al, Fe3Al-10Mn and Fe3Al-10Cr alloys were prepared on different substrates including glass and copper by aluminothermic reaction. The effects of substrates and alloying elements on the microstructures and mechanical properties of the resulting samples were investigated. The results show that the ordered DO3 structure exists in Fe3Al-10Mn alloy prepared on glass substrate, while other alloys are disordered bcc structures. The average grain size of alloys prepared on the glass substrate is 27, 19 and 23 nm, repectively. For alloys prepared on the copper substrate, the grain size is 18, 15 and 22 nm. The yield strength and hardness of Fe3Al and Fe3Al-IOMn alloys prepared on the glass substrate decrease slightly compared with those on the copper substrate, while Fe3Al alloy have the better plasticity. The Vickers hardness and yield strength of Fe3Al-10Cr alloy prepared on the glass substrate was increased by 42.4% to 292 HV30 and 20% to 960 MPa, repectively. The alloying elements have little influence on the plasticity but a significant improvement on the yield strength of alloys.

关 键 词：纳米晶Fe3Al 底材 微观组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]