The influence of different preparation methods on the microstructures and properties of the in situ bulk-metallic-glass-
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P.F. Sha and Z.W. Zhu Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
D.C. Yu College of Sciences, Northeastern University, Shenyang 110819, China
H.M. Fu, A.M. Wang, H. Li, H.W. Zhang, and H.F. Zhanga) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China (Received 17 September 2014; accepted 10 December 2014)
In this work, the effects of different preparation methods on the microstructures and properties of the Ti45.7Zr33Ni3Cu5.8Be12.5 alloy were systematically studied by both experimental and numerical ways. It is found that the heating methods and the cooling rate during the process of preparation have great influences not only on the morphology and crystalline structure of the solid solutions but also on the thermal stability of the amorphous phase. Furthermore, the different crystalline structures and micromorphologies of the ductile phase will also influence the mechanical properties. And the uniaxial compression tests at room temperature verify that the Ti45.7Zr33Ni3Cu5.8Be12.5 samples obtained by different preparation methods possess different degrees of plasticity. The better comprehensive properties were found for samples with a larger size under the copper mold cooling conditions. The variation of the morphology of the solid solution phase under different preparation conditions is believed to be the vital factor that leads to the diversity in properties.
I. INTRODUCTION
Recently, the in situ bulk metallic glass matrix composites (in situ BMGCs) especially the one with tough dendritic phase gradually became the hot spot in the bulk metallic glass materials due to their distinctive mechanical properties. On the one hand, large numbers of in situ BMGCs having excellent mechanical properties have been developed.1 For example, Hoffman et al.2,3 designed a series of Zr-based and Ti-based in situ BMGCs with considerable plastic deformation and high fracture toughness. Jeon et al.4 successfully developed the in situ bulk metallic glass matrix composites possessing high yield strength (1.3 GPa) and obvious plastic deformation (;7%) through optimizing the conventional Ti–6Al–4V alloy. On the other hand, the deformation mechanism by which the in situ BMGCs with tough dendritic phase aroused a lot of attention. Oh et al.,4 Ha et al.,5 and Qiao et al.6,7 Contributing Editor: Franz Faupel a) Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2014.406 512
J. Mater. Res., Vol. 30, No. 4, Feb 28, 2015
http://journals.cambridge.org
Downloaded: 03 Mar 2015
systematically analyzed and studied the mechanical behavior and microdeformation mechanism of these in situ bulk metallic glass matrix composites. The results revealed that the mechanical behaviors of these composites are not only related to the deformation behaviors of the two phases but also closely to the microstructures of the materials. Furthermore, He,8 Eckert,8,9
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