Cu对铝热法制备的Fe_3Al-10%Ni块体纳米晶材料组织和性能影响  

Effects of Cu on Microstructure and Mechanical Properties of Fe_3Al-10%Ni Bulk Nanocrystalline Prepared by Aluminothermic Reaction

作　　者：喇培清[1] 刘雪梅[1] 刘辉[1] 卢学峰[1] 魏玉鹏[1] 白亚平[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实验室,兰州730050

出　　处：《航空材料学报》2011年第6期7-11,共5页Journal of Aeronautical Materials

基　　金：国家自然科学基金(51164022)

摘　　要：通过铝热法制备了Cu含量为2%,4%,6%(质量分数,下同)的Fe3Al-10%Ni块体纳米晶材料,用光学显微镜(OM),电子探针(EPMA),X-射线衍射仪(XRD)和透射电镜(TEM)表征了材料的微观结构,并测定了材料的维氏硬度和室温压缩性能。结果表明:Cu含量低(2%)时,合金保持无序bcc结构,晶粒尺寸显著下降;高Cu含量(4%和6%)使合金发生B2型有序化转变。添加Cu元素提高了材料的硬度,但不利于材料塑性的提高。添加2%和6%的Cu元素使材料的屈服强度明显增加,而添加4%的Cu元素使材料的强度明显下降。Effects of Cu additions on microstructure and mechanical properties of Fe3Al-10%Ni bulk nanocrystalline prepared by aluminothermic reaction were studied.The microstructure was studied by OM,EPMA,XRD and TEM,and the hardness and compressive strength were measured.The results reveal that the low Cu content（2%） maintained the bcc crystal structure and resulted in a sharp decrease of the average grain size.However,high Cu contents（4% and 6%） caused the structure ordering to B2.The hardness increased after adding Cu.A high Cu content was not benefit to the plasticity.The yield strength increased slightly at 2% and 6% Cu,but decreased a lot at 4% Cu.

关 键 词：块体纳米晶 铝热法 Cu元素 塑性 

分 类 号：TG113.2[金属学及工艺—物理冶金]