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Powder Metallurgy of Nanostructured High Strength Materials
Eckert J.,Scudino S.,Yu P.,Duhamel C. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nanostructured or partially amorphous Al-and Zr-based alloys are attractive candidates for advanced high-strength lightweight materials. Such alloys can be prepared by quenching from the melt or by powder metallurgy using mechanical attrition techniques. This work focuses on mechanically attrited powders and their consolidation into bulk specimens. Selected examples of mechanical deformation behavior are presented, revealing that the properties can be tuned within a wide range of strength and ductility as a function of size and volume fraction of the different phases.
How to Improve the Ductility of Nanostructured Materials
Eckert J.,Duhamel C.,Das J.,Scudino S.,Zhang Z. F.,Kim, K. B. The Korean Powder Metallurgy Institute 2006 한국분말재료학회지 (KPMI) Vol.13 No.5
Nanostructured materials exhibit attractive mechanical properties that are often superior to the performance of their coarse-grained counterparts. However, one major drawback is their low ductility, which limits their potential applications. In this paper, different strategies to obtain both high strength and enhanced ductility in nanostructured materials are reported for Ti-base and Zr-base alloys. The first approach consists of designing an in-situ composite microstructure containing ductile bcc or hop dendrites that are homogeneously dispersed in a nanostructured matrix. The second approach is related to refining the eutectic structure of a Ti-Fe-Sn alloy. For all these materials, the microstructure, mechanical properties, deformation and fracture mechanisms will be discussed.
Fabrication of Fe-based bulk metallic glass by selective laser melting: A parameter study
Jung, H.Y.,Choi, S.J.,Prashanth, K.G.,Stoica, M.,Scudino, S.,Yi, S.,Kuhn, U.,Kim, D.H.,Kim, K.B.,Eckert, J. Elsevier Ltd 2015 Materials & Design Vol.86 No.-
Soft magnetic Fe-based bulk metallic glass cylindrical specimens with a diameter of 2mm and height of 6mm have been successfully fabricated by selective laser melting (SLM) and the effect of scan speed v and laser power P on the microstructure, thermal stability and soft magnetic properties has been investigated. The results indicate that low v and high P lead to the formation of SLM samples with high relative densities, which can reach values of about 99.7%. This can be ascribed to the optimal energy transfer during processing at low v and high P. Structural and calorimetric studies prove that the SLM samples are fully amorphous. In addition, magnetic measurements reveal that the amorphous structure of the SLM material is identical to the parent atomized powders. Although additional work is required to remove the residual porosity and to avoid the formation of cracks during processing, the present results confirm that additive manufacturing by SLM represents an alternative processing route for the preparation of bulk metallic glass components with designed geometry having excellent magnetic softness.