Enhancement of plasticity in Ti-based metallic glass matrix composites by controlling characteristic and volume fraction
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J.H. Na California Institute of Technology, Division of Engineering and Applied Science, Pasadena, California 91125
J.M. Park Center for Non-Crystalline Materials, Department of Materials Science and Engineering, Yonsei University, Seodaemun-Ku, Seoul 120-749, South Korea; and IFW Dresden, Institute for Complex Materials, D-01171 Dresden, Germany
W.T. Kim IT Division, Cheongju University, Cheongju 360-764, South Korea
D.H. Kima) Center for Non-Crystalline Materials, Department of Materials Science and Engineering, Yonsei University, Seodaemun-Ku, Seoul 120-749, South Korea (Received 28 April 2010; accepted 28 July 2010)
In this study, Ti-based metallic glass matrix composites with high plasticity have been developed by controlling characteristic and volume fraction of primary phase embedded in the glass matrix. By careful alloy design procedure, the compositions of b/glass phases, which are in metastable equilibrium have been properly selected, therefore the mechanical properties can be tailored by selecting the alloy compositions between the composition of b and glass phases. The relation between the compressive yield strength and volume fraction of b phase is well described using the rule of mixtures. I. INTRODUCTION
A number of bulk metallic glasses (BMGs) have been developed as potential engineering materials having unique properties due to the random atomic configurations. The BMGs exhibit promising properties such as high yield strength and hardness, large elastic limit, and good corrosion resistance.1 Despite these promising properties, the application of the BMGs as a structural material is limited. One of the major drawbacks of the BMGs is their limited plasticity, compared with currently used crystalline alloys. To improve the plasticity of BMGs, a great amount of research has been performed. The main idea for enhancement of plasticity is to introduce some inhomogeniety, ranging atomic scale to micrometer (mm) scale in BMG matrix with an intention either to enhance shear band nucleation or to block shear band propagation. One of the ways to introduce inhomogeniety is to develop metallic glass matrix composites (MGMCs) consisting of crystalline phases distributed in the BMG matrix.2 The MGMCs have been found to exhibit enhanced plasticity, which is not genera)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/JMR.2010.0277 J. Mater. Res., Vol. 25, No. 11, Nov 2010
ally observed in monolithic BMGs.3,4 Such an enhancement of plasticity stems possibly from the formation of multiple shear bands initiated at the interface between the reinforcing agent and the metallic glass matrix, and their confinement in MGMCs.5–8 From this point of view, recently, many researchers have investigated extensively the development of MGMCs mainly in Zr-based metallic glasses.9,10 However, to extend the application fields of the BMGs, more attention should be drawn to the development of BMGs based on common metals such as Ni, Cu, Fe, and Ti.11 In contrast to Zr-based MGMCs, Ti-based MGMCs h
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