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利用激光铸造技术成功制备以原子百分比配置的Ni75Al25-xSix(x=0,20)多相金属间化合物合金.使用X射线衍射(XRD)、光学显微镜和扫描电子显微镜(SEM)对合金进行物相鉴定及显微组织分析.使用显微硬度计对其进行显微硬度测试.结果表明,未添加Si元素的合金主要由Ni3Al、γ-Ni和少量的NiAl相组成.显微组织呈细小、均匀的树枝晶,在枝晶间分布有层片状组织.添加原子分数20%的Si元素的合金,除了Ni3Al和-γNi外,还包括Al3Ni2和较多的NiAl相;显微组织呈均匀、致密的网状树枝晶生长;平均显微硬度742 HV,约为未添加Si元素合金的1.9倍.
The Ni75Al25-xSix (x = 0, 20) multi-phase intermetallic compound alloy with atomic percentage configuration was successfully prepared by laser casting technology.The phase of the alloy was characterized by XRD, optical microscope and scanning electron microscope Identification and microstructure analysis.Using a microhardness tester to test the microhardness of the alloy.The results show that the alloy without adding Si element mainly consists of Ni3Al, γ-Ni and a small amount of NiAl phase.The microstructure is fine and uniform Of the dendrite distributed in the dendritic lamellar structure.Add Si atomic percentages of 20% of the alloy, in addition to Ni3Al and -γNi, but also include Al3Ni2 and more NiAl phase; microstructure was uniform and compact Of the network dendrite growth; average microhardness of 742 HV, about 1.9 times the alloy without adding Si.