热爆合成Ni-Al金属间化合物的物相及组织结构  

Phase constitution and microstructure of Ni-Al intermetallic compounds fabricated by thermal explosion

作　　者：崔洪芝[1] 魏娜[1] 赫庆坤[1] 白斌[1] 

机构地区：[1]山东科技大学材料科学与工程学院,山东青岛266590

出　　处：《材料热处理学报》2013年第7期1-5,共5页Transactions of Materials and Heat Treatment

基　　金：国家自然基金资助项目(51072104;51272141);山东省"泰山学者"计划(ts20110828);山东省博士基金(BS2010CL038)

摘　　要：以Ni粉和Al粉为原料,通过热爆反应合成及空冷制备Ni-Al系金属间化合物。利用X射线衍射仪、电子探针和显微硬度计分析了合成试样的物相组成、显微组织及硬度。结果表明:当Ni、Al摩尔比为1∶1时,反应生成物为单一的枝晶状NiAl相;当Ni、Al摩尔比为3∶1时,生成物组织形态复杂,主要由枝晶状β-NiAl、粗大块状和网状γ-Ni3Al、不规则的块状或者短棒状γ'-Ni3Al、板条状和针片状M-NiAl组成。因为γ'-Ni3Al在β-NiAl晶粒内部析出造成的应力场、NiAl中富含大量Ni及非平衡冷却,有利于β-NiAl转变成M-NiAl。Thermal explosion method was employed to produce Ni-Al intermetallic compounds using elemental Ni and Al powder mixture.The phase constitution,microstructure and microhardness of the products were investigated by means of X-ray diffraction,electron probe microanalysis and microhardness test.The results indicate that a uniform dendritic structure consisting of single NiAl is obtained with the composition of Ni∶Al=1∶1（molar ratio）.When the molar ratio of Ni∶Al is 3∶1,the phases are mainly composited of β-NiAl phase with dendritic structure,γ′-Ni3Al phase with irregular block and net-like morphology,γ′-Ni3Al phase with irregular and pointed strip-like morphology and M-NiAl phase with needle-like and lath-shaped morphology.The precipitation of γ′-Ni3Al causes the stress field,the NiAl is a Ni-rich phase and the cooling process is non-equilibrium,these are all beneficial for the β-NiAl phase transforming to M-NiAl phase.

关 键 词：NIAL NI3AL 热爆合成 物相组成 组织结构 

分 类 号：TG132.2[一般工业技术—材料科学与工程]