Effect of WC/WC grain boundary misorientation angle on the local hardness in WC–Co cemented carbides

IF 5.3 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-01-20 DOI:10.1016/j.scriptamat.2024.116525

Hansheng Chen , Haoruo Zhou , Xiangyuan Cui , Christoph Czettl , Thomas Weirather , Julia Pachlhofer , Pauline Mueller , Tamara Teppernegg , Ralph Useldinger , Sophie Primig , Simon P. Ringer

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Abstract

Grain boundaries (GBs) generally exhibit complex structural and compositional features that significantly affect material hardness. Here, we establish a methodology to correlate the local hardness contributions of the GBs with their frequency distribution and their structural and compositional characteristics, using a submicron WC–Co cemented carbide as a model. An exceptional local hardness of (14.68 ± 0.12) GPa is observed from a 90° WC_{0001}/WC_{10

_{\bar{1}}

_0} GB, unlike the low contributions from other WC/WC GBs. This is linked to pronounced Cr and Co segregation at this GB, due to Cr affinity at the WC_{0001}/Co and WC_{10

_{\bar{1}}

_0}/Co phase boundaries and Co infiltration during liquid-phase sintering. Density functional theory results indicate that a large lattice mismatch, strong W–C covalent bonding, and Cr and Co accumulation increase the elastic strain field, resulting in strong atomic distortion near the interface and contributing to exceptional strengthening. Our findings highlight the critical influence of GB complexities on material hardness.

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.