Novel hard materials with controlled (W_0.5Al_0.5)C grain shapes: in-situ high pressure preparation and mechanical properties

Zhuhui QIAO 1,2), Xianfeng MA 2), Huaguo TANG 2), Wei ZHAO 2) and Jianwei LIU 2) 1) State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China 2) CAS Key Laboratory of Rare Earth on Advanced Materials and Valuable Utilization of Resources, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

摘 要：A novel hard material with various （W0.5Al0.5）C grain shapes was successfully prepared through mechanical alloying and in-situ high-pressure sintering process. X-ray diffraction apparatus and scanning electron microscopy were used to characterize the phase and the microstructures of the samples. The novel hard materials with "fibrous", "rounded" and "plate-like" grains, which do not contain sharp edges, have the improved mechanical properties. The bulk boundless （W0.5Al0.5）C hard material with various （W0.5Al0.5）C grain shapes possesses good mechanical properties and light weight. The formation mechanism for the non-equilibrium （W0.5Al0.5）C grains during in-situ high-pressure sintering is also discussed.

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