中文摘要：

采用镶嵌式扩散偶技术制备Ni-Al扩散偶,在Al熔点和Ni熔点之间的不同温度保温不同时间进行扩散处理。研究Ni-Al固/液扩散偶的组织结构演变及形成机理。结果表明：在Ni基被完全消耗之前,扩散偶的组织结构为Ni/Ni2Al3/NiAl3/Al＋NiAl3,Ni基耗完之后继续保温一段时间,Ni2Al3消失,整个扩散偶均由Al＋NiAl3的混合组织组成;Ni2Al3层是保温过程中第一个出现的也是唯一出现的连续单相层,NiAl3层则是在冷却过程中形成的;Al基中存在粗大块状和弥散细小状的NiAl3析出相,在NiAl3析出相之间存在无析出区,从界面附近到远离界面,NiAl3析出相和无析出区的尺寸逐渐变小。

英文摘要：

The diffusion couples of Ni/Al were prepared using embedded diffusion couple technology,then,treated at different temperatures between the melting point of Al and Ni for different holding times.The microstructure evolution and forming mechanism of Ni-Al solid/liquid diffusion couple at different temperatures for different holding times were investigated through embedded diffusion couple technology.The results show that the structures of the diffusion couples are Ni/Ni2Al3/NiAl3/Al＋NiAl3 before the Ni substrate is fully consumed.If Ni substrate is consumed completely and heat is hold for some time,Ni2Al3 layer disappears and the structure changes into Al＋NiAl3.Ni2Al3 layer forms first and is only single-phase layer during holding time and NiAl3 layer forms during cooling.The large bulk and small particle NiAl3 precipitate in the Al substrate.At the same time,the non-precipitation zones also emergence because of Ni-poor.From the vicinity of the interface to the distance,the NiAl3 precipitates and the size of non-precipitation zones gradually become small.