STP600: Fractography: Fracture Energy and Quantitative Metallographic Correlation for Tungsten-Silver Composite Materials

    Warke, WR
    Associate professor, Illinois Institute of Technology, Metallurgical and Materials Engineering Department, Chicago, Ill.

    Witter, GJ
    Manager, Advanced ENgineering, Electronics Products Division, Fansteel, Inc., North Chicago, Ill.

    Pages: 15    Published: Jan 1976


    Abstract

    Tungsten-silver materials were made by two different powder metallurgical techniques which resulted in alloys having a wide latitude of structural variation in terms of volume fraction, particle size, and distribution. A correlation of GIc, the critical strain energy release rate, was made with the quantitative metallographic parameters ¯L3Ag, the mean intercept length within the silver phase; C, the contiguity of the tungsten phase; and VνAg, the volume fraction of the silver phase. A term composed of these three parameters was found to have a good correlation with GIc for all the alloys. A study of the fracture surfaces of each alloy by energy-dispersive X-ray analysis shows the silver content of the fracture surfaces decreases as the toughness of the alloys decreases.

    Keywords:

    fractography, crack propagation, fatigue (materials), fracture properties, metal particle composites, tungsten, silver


    Paper ID: STP29195S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP29195S


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