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Microstructure of a V-Containing Cobalt Based Alloy Prepared by Mechanical Alloying and Hot Pressed Sintering

1
School of Chemical Engineering, Shandong University of Technology, Zibo 255049, China
2
School of Mechanical Engineering, Shandong University of Technology, Zibo 255049, China
3
Analysis & Testing Center, Shandong University of Technology, Zibo 255049, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(4), 464; https://doi.org/10.3390/met9040464
Received: 8 March 2019 / Revised: 12 April 2019 / Accepted: 16 April 2019 / Published: 22 April 2019
(This article belongs to the Special Issue Metals Powders: Synthesis and Processing)
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Abstract

In this paper, a bulk V-containing cobalt-based alloy with high chromium and tungsten contents was prepared by mechanical alloying and hot pressed sintering using Co, Cr, W, Ni, V and C pure element powders. XRD, SEM, TEM and Vickers hardness tests were employed to characterize the microstructure and mechanical properties of the mechanical alloyed powders and hot pressed bulk cobalt-based alloy. The results show that all elements can be mixed uniformly and that the Co, Cr, and Ni elements were made into an amorphous state after 10 h ball milling in a high energy ball miller. The microstructure of the prepared bulk alloy was composed of a γ-Co matrix with a large number of nano-twins and fine M23C6 and M12C carbide particles well-distributed in the alloy. The V element was mainly distributed in M23C6-type carbide and no V-rich MC-type carbide was found in the microstructure. The prepared alloy had a high hardness of 960 ± 9.2 HV and good a fracture toughness KIc of about 10.5 ± 0.46 MPa·m1/2. The microstructure formation and strengthening mechanisms of the prepared cobalt-based alloy are discussed. View Full-Text
Keywords: cobalt-based alloy; mechanical alloying; hot pressed sintering; microstructure cobalt-based alloy; mechanical alloying; hot pressed sintering; microstructure
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Li, N.; Yin, F.; Feng, L. Microstructure of a V-Containing Cobalt Based Alloy Prepared by Mechanical Alloying and Hot Pressed Sintering. Metals 2019, 9, 464.

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