Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping

Autor: Baolong Zheng, John E. Smugeresky, Yizhang Zhou, Enrique J. Lavernia
Rok vydání: 2009
Předmět:
Zdroj: Zheng, B.; Zhou, Y.; Smugeresky, J. E.; & Lavernia, E. J.(2009). Processing and Behavior of Fe-Based Metallic Glass Components via Laser-Engineered Net Shaping. Metallurgical and Materials Transactions A, 40(5), pp 1235-1245. doi: 10.1007/s11661-009-9828-y. Retrieved from: http://www.escholarship.org/uc/item/7961j3mz
ISSN: 1543-1940
1073-5623
DOI: 10.1007/s11661-009-9828-y
Popis: In this article, the laser-engineered net shaping (LENS) process is implemented to fabricate net-shaped Fe-based Fe-B-Cr-C-Mn-Mo-W-Zr metallic glass (MG) components. The glass-forming ability (GFA), glass transition, crystallization behavior, and mechanical properties of the glassy alloy are analyzed to provide fundamental insights into the underlying physical mechanisms. The microstructures of various LENS-processed component geometries are characterized via scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), and transmission electron microscopy (TEM). The results reveal that the as-processed microstructure consists of nanocrystalline α-Fe particles embedded in an amorphous matrix. An amorphous microstructure is observed in deposited layers that are located near the substrate. From a microstructure standpoint, the fraction of crystalline phases increases with the increasing number of deposited layers, effectively resulting in the formation of a functionally graded microstructure with in-situ-precipitated particles in an MG matrix. The microhardness of LENS-processed Fe-based MG components has a high value of 9.52 GPa.
Databáze: OpenAIRE
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