Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 612, Issue -, Pages 115-122Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2014.06.020
Keywords
Hard metals; Compressive strength; Strain-rate dependence; Spark plasma sintering
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Funding
- Dr.-Erich-Kruger Foundation
- Structure Design of Novel High-Performance Materials via Atomic Design and Defect Engineering (ADDE) Cluster of Excellence - European Union (European Regional Development Fund)
- Saxon Ministry of Science and Fine Arts (SMWK)
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The strain-rate dependence of WC-Co hard metals with binder contents of 6, 8, 10 and 12 wt% was investigated. The materials were processed by spark plasma sintering and exhibited WC grain sizes of about 200 nm. Static compressive strength was investigated using a servo-hydraulic testing machine. Dynamic compression tests were performed in an instrumented drop-weight tester as well as a modified Split-Hopkinson pressure bar (MSHPB). The compressive strength of the cylindrical test specimens increased with decreasing Co content and increasing strain rate, from 4370 MPa for WC-12Co under quasi-static loading to 6660 MPa for WC-6Co under dynamic loading. For the evaluation of the fracture mechanisms, the fragment size of the broken parts was determined by optical particle analysis. The results indicated an increase in microcrack density with increasing strain rate. Based on the findings, different model curves were fitted to the experimental data to describe the strain-rate dependent compressive strength with respect to Co content. (C) 2014 Elsevier B.V. All rights reserved.
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