Microstructure of the Ni binder phase in a TiC–Mo₂C–Ni cermet

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• 作者：Zackrisson ; J. ; Larsson ; A. ; André ; n ; H.-O.
• 关键词：TEM ; SAED ; EDX ; Intermetallic Ni₃Ti ; Hardmetal ; Metal cutting
• 刊名：Micron
• 出版年：2001
• 期刊代码：37_09684328
• 类别：ph
• 出版时间：2001
• 卷：32
• 期：8
• 页码：707-712
• 文件大小：1.50 M

摘要

Cermets are wear resistant materials used in cutting tool applications. The materials are composed of hard phase grains surrounded by a tough binder phase. The mechanical properties are influenced by both phases and grain boundaries. In this work, the detailed microstructure of the Ni binder phase in a TiC–Mo₂C–Ni cermet has been studied using a combination of transmission electron microscopy techniques. A complex contrast was observed in the Ni binder when imaged in the transmission electron microscope. It was found to arise from a combination of dislocations and nanometer sized particles that were present in the Ni matrix. From electron diffraction the particles were identified as intermetallic Ni₃Ti (P6₃/mmc). This result was consistent with energy-dispersive microanalysis and thermodynamics. The orientation relationship between the hexagonal Ni₃Ti particles and the cubic Ni matrix was given by (0001)Ni₃Ti//(111)Ni and [1210]Ni₃Ti//[110]Ni.