Formation of yittrium oxide in cemented carbides

Xiaofeng LiCollege of Materials Science and Engineering, North University of China, Taiyuan, P.R. China;The State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P.R. China

Yong LiuThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P.R. ChinaCorrespondence[email protected]

Te HuThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P.R. China

Bin LiuThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P.R. China

Congzhang QiuThe State Key Laboratory of Powder Metallurgy, Central South University, Changsha, P.R. China;Changsha Advanced Material Industry Research Institute, Changsha, P.R. China

Zhanyong ZhaoCollege of Materials Science and Engineering, North University of China, Taiyuan, P.R. China

Bin LiuCollege of Materials Science and Engineering, North University of China, Taiyuan, P.R. China

Peikang BaiCollege of Materials Science and Engineering, North University of China, Taiyuan, P.R. China

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Abstract

Rare-earth (RE) elements are helpful in improving the mechanical properties of cemented carbides. In this work, the formation of Y₂O₃ in functionally graded cemented carbides is investigated using transmission electron microscopy. The results indicate that Y₂O₃ can stabilize the Co phase with the face-centred cubic structure (α-Co), since it has a cubic structure similar to the high-temperature Co phase. The α-Co phase has a higher plasticity than ε-Co, and this suggests a possible mechanism for the role of RE elements in toughening cemented carbides.

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Formation of yittrium oxide in cemented carbides

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Formation of yittrium oxide in cemented carbides

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