感应加热辅助自蔓延高温合成NiAl金属间化合物的组织与性能  

Microstructure and Performance of NiAl Intermetallic Compounds Prepared by Self-Propagation High-Temperature Synthesis with Induction Heating

作　　者：叶明敬 程晓敏[1] 朱晓萌[1] 

机构地区：[1]武汉理工大学材料科学与工程学院,湖北武汉430070

出　　处：《材料保护》2016年第10期45-48,共4页Materials Protection

基　　金：武汉理工大学自主创新研究基金(2015-zy-003)资助

摘　　要：目前,关于感应加热电磁场对Ni/Al粉末混合物加热机制以及原料粒度对合成产物微观形貌和性能的影响报道较少。采用电磁感应加热的方式对Ni粉和Al粉压坯进行点火触发自蔓延合成反应,生成Ni Al金属间化合物。利用XRD、SEM、EDS、纳米压痕等测试技术分析了生成物的相组成、微观结构和力学性能。结果表明:在原料中Al粉的粒径足够大时,电磁感应加热辅助自蔓延合成Ni Al金属间化合物能够实现全液相合成Ni Al单相,持续加载的电磁场、较大的线圈电流可能会抑制晶粒的长大,提高合成产物的力学性能。NiAl intermetallic compounds were prepared by selfpropagation high-temperature synthesis(SHS) reaction which was triggered by electromagnetic:induction heating on the Ni powder and Al powder calender profiling.The phase composition,micros tructure and mechanical properties of synthesized products were studied by XRD,SEM,EDS and nanoindentation.Results showed that when the size of the Al powder particle in raw material was large enough,the induction heating assisted SHS of NiAl intermetallic compounds could achieve a single phase of NiAl in entire liquid phase.Particularly,continuous loading electromagnetic field and larger coil current could restrain the growth of grain and improve the mechanical properties of the synthesized product.

关 键 词：磁感应加热 自蔓延 NIAL金属间化合物 组织结构 力学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]