STP600

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

    Published: Jan 1976


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    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


    Author Information:

    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.


    Paper ID: STP29195S

    Committee/Subcommittee: E08.08

    DOI: 10.1520/STP29195S


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