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Papers by Author: J.M. Park

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Development of Shear Bands in a Bulk Metallic Glass and Composite upon Cold Rolling

Authors: J.S. Park, H.K. Lim, J.H. Kim, J.M. Park, H.J. Chang, Won Tae Kim, Do Hyang Kim

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Iridium Oxide as a Stimulating Neural Electrode Formed by Reactive Magnetron Sputtering

Authors: In Seop Lee, J.M. Park, Hyun Joo Son, Jong Chul Park, Geun Hee Lee, Y.H. Lee, Fu Zhai Cui

Abstract: Implantable neural prostheses form hybrid interfaces with biological constructs, and the application of electrical fields can restore functions of patients with neurological damages. The various stoichiometric compositions of iridium oxide were synthesized using reactive magnetron sputtering. The charge injection behavior of iridium oxide deposited with an O2/Ar ratio of 0.5 was similar to pure Ir. The charge density of iridium oxide increased with increasing O2/Ar ratio, and increasing thickness of iridium oxide.

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Ti-Based Bulk Metallic Glass with High Cold Workability at Room Temperature

Authors: J.M. Park, J.S. Park, J.H. Kim, Myung Hyun Lee, Won Tae Kim, Do Hyang Kim

Abstract: The cold workability of Ti-based bulk metallic glasses (BMGs) have been investigated. Ti45Zr16Be20Cu10Ni9 BMG with a large compressive plastic strain of 4.7 % shows a high cold workability, i.e. total reduction ratio of 50 % by cold rolling at room temperature. The multiple shear bands formed during rolling are effective in enhancing the plasticity. The cold rolled Ti45Zr16Be20Cu10Ni9 BMG (reduction ratio: 30 %) exhibits a large plastic strain of ~14 %.

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