底材厚度和稀释剂对纳米晶Fe-Al-Ni材料性能的影响  

Effect of substrate thickness and diluents on mechanical properties of nano-crystalline Fe-Al-Ni materials

作　　者：喇培清[1] 李翠玲[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,兰州730050

出　　处：《粉末冶金技术》2011年第3期183-189,共7页Powder Metallurgy Technology

基　　金：国家自然科学基金资助项目(50674051)

摘　　要：通过铝热法分别在不同底材厚度和稀释剂条件下制备了含10%(质量分数)N i的纳米晶Fe3Al材料,对制得的材料进行了金相组织观察,XRD和TEM分析,并测试了应力应变曲线和屈服强度。研究结果表明:随着沉积底材厚度的增加,材料的晶体结构没有发生变化,主要由无序bcc结构的Fe3A l相组成;但材料的平均晶粒尺寸和屈服强度都增大,同时材料在断裂前的最大变形量也呈增大趋势,塑性提高。随着稀释剂的增加,材料的平均晶粒尺寸和屈服强度都呈现先减小后增大的趋势,且在未添加稀释剂的时候其值分别达到最大值;当添加稀释剂为20%(质量分数)的时候,材料中出现了有序B2结构的(200)峰,材料结构趋于有序,同时塑性有所降低,稀释剂为40%(质量分数)时,材料的最大变形量最大,塑性变形能力最强。Effect of substrate thickness and diluents on the microstructure and mechanical properties of nano-crystalline Fe3Al with 10 wt.% Ni prepared by aluminothermy reaction was investigated in the present work.The results show that substrate thickness has no influence on the crystal structure which is composed mainly of Fe3Al phase of disordered bcc structure.With the substrate thickness increasing,both the average grain size and yield strength of the materials improve,at the same time,the maximum deformation before fracture increases,representing the improved plasticity of materials.With the more addition of diluents,the average grain size increases at first and then decreases,which is the same as the change of yield strength;When the diluents is 20 wt%,the B2 structure is discovered in the materials and the plasticity of material decreases.While the diluents reaches 40 wt.%,the plasticity is the best.

关 键 词：纳米晶 FE3AL 底材厚度 稀释剂 组织 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]