Strain rate response of a Zr-based composite fabricated by Bridgman solidification |
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| Authors: | Jun-wei Qiao Yong Zhang Ji-heng Li Guo-liang Chen |
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| Institution: | (1) School of Mechanical Engineering, North China University of Water Conservancy and Electric Power, Zhengzhou, 450011, China;(2) Joint Laboratory of Nanostructured Materials and Technology, Nanjing University of Science and Technology, Nanjing, 210094, China;(3) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China |
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| Abstract: | Zr58.5Ti14.3Nb5.2Cu6.1Ni4.9Be11.0 bulk metallic glass matrix composites, containing β-Zr dendrites, were fabricated by Bridgman solidification at the withdrawal
velocity of 1.0 mm/s through a temperature gradient of ∼45 K/mm. Subjected to the increasing compressive strain rates, the
monotonic increasing and decreasing were obtained for the maximum strength and the fracture strain, respectively. The results
show that high strain rate may induce the insufficient time for the interaction between shear bands and the crystalline phase,
and early fracture occurs as a result. The fractographs are consistent with the mechanical properties, and the failure mode
of the present Zr-based composites is in agreement with the frame of the ellipse criterion. |
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