等温处理对含10wt%Mo的纳米晶Fe_3Al性能的影响  

Effect of annealing on mechanical properties of nano-crystalline Fe_3Al with 10 wt% Mo

作　　者：喇培清[1] 李翠玲[1] 杨洋[1] 白亚平[1] 魏玉鹏[1] 卢学峰[1] 郭鑫[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,甘肃兰州730050

出　　处：《材料热处理学报》2011年第6期1-5,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50674051)

摘　　要：通过铝热反应法制备了含10 wt%Mo的纳米晶Fe3Al材料,并对制得的材料进行了600和800℃的等温热处理,利用XRD和TEM研究了等温热处理前后组织的变化,并测试了应力应变曲线和屈服强度。结果表明:等温热处理前后,材料的晶体结构没有发生变化,均由无序bcc结构的Fe3Al相组成;材料经热处理后的平均晶粒尺寸和屈服强度在600～800℃之间增加显著,并在800℃等温热处理8 h后分别达到最大值43 nm和960 MPa;热处理后,材料在断裂前的最大变形量提高了15%左右,并有良好的塑性变形平台,塑性显著提高。等温热处理是一种提高纳米晶材料综合力学性能的可行方法。Bulk nano-crystalline Fe3Al with 10 wt% Mo were prepared by aluminothermic reaction and then were annealed at 600 and 800 ℃.The crystal structure and grain size of the materials were investigated by X-ray diffraction and transmission electron microscopy.Compressive properties of the materials were also tested.The results show that the materials still had disordered bcc structure of Fe3Al phase after annealing.Average grain size and yield strength of the materials increased significantly with increasing annealing temperature at 600-800 ℃,and reached the maxium values of 43 nm and 960 MPa after annealing at 800 ℃ for 8 h,respectively.After annealing,the maxium deformation before fracture increased by about 15%,which indicated the plasticity of the materials is improved markedly.Annealing is beneficial to improve both the yield strength and plasticity of nano-crystalline Fe3Al intermetallics.

关 键 词：FE3AL 纳米晶 等温处理 组织 力学性能 

分 类 号：TG13[一般工业技术—材料科学与工程]