Growth and Microstructure‐Dependent Hardness of Directionally Solidified WC–W2C Eutectoid Ceramics. Issue 7 (26th March 2015)

• Record Type: Journal Article
• Authors: Chen, Wei‐Ting; Meredith, Caleb H.; Dickey, Elizabeth C.; Trice, R.
• Is Part Of: Journal of the American Ceramic Society. Volume 98:Issue 7(2015)
• Page Start: 2191
• Page End: 2196
• Publication Date: 2015-03-26
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13561
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13561-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Directionally solidified WC–W₂C ceramics containing 40 at% carbon, corresponding to the WC–W₂C eutectoid composition, were produced by laser surface melt processing. The resulting microstructures showed a lamellar‐type eutectic/eutectoid microstructure with the WC minor phase embedded in the W₂C matrix phase. The interlamellar spacing (λ) in the eutectoid regions followed the relationship <italic>V</italic>λ^3.8 = constant, with the smallest spacing of 331 ± 36 nm achieved in the 3.24 mm/s processed sample. The indentation hardness increased with decreasing interlamellar spacing, and a Vickers indentation hardness of 28.5 GPa was achieved in the sample with the smallest interlamellar spacing. The directionally solidified WC–W₂C materials show enhanced indentation mechanical properties in comparison to previously reported WC–Co composites and WC‐based materials.</p> </abstract>