Papers by Author: Dmitri V. Louzguine-Luzgin

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Authors: Guo Qiang Xie, Dmitri V. Louzguine-Luzgin, Mikio Fukuhara, Akihisa Inoue
Abstract: Large-size Ni-based bulk metallic glass (BMG) composite samples exhibiting simultaneously high strength, enhanced plasticity and improved conductivity were produced by spark plasma sintering of mixed glassy powder blended with high-conductive Cu particulates. This opens new possibilities for the applications of the BMG composites as functional and structural materials.
Authors: Alain Reza Yavari, S. Pang, Dmitri V. Louzguine-Luzgin, Akihisa Inoue, N. Lupu, N. Nikolov, G. Heunen
Authors: Guo Qiang Xie, Dmitri V. Louzguine-Luzgin, Mikio Fukuhara, Hisamichi Kimura, Akihisa Inoue
Abstract: We investigated consolidation behavior of gas-atomized Cu50Zr45Al5 metallic glassy alloy powders by a spark plasma sintering (SPS) process. Density of the sintered samples increased with an increase in sintering temperature. The nearly full density samples without crystallization could be attained by the SPS process at sintering temperature of 693 K under pressure of 600 MPa. The produced samples exhibited high-strength and met large-size requirement. The SPS process makes it possible to fabricate the large-size bulk metallic glasses without limitation of dimensions and alloy system.
Authors: Hidemi Kato, Dmitri V. Louzguine-Luzgin, Akihisa Inoue, Hyoung Seop Kim, Sun Ig Hong
Authors: Guo Qiang Xie, Dmitri V. Louzguine-Luzgin, Hisamichi Kimura, Fumihiro Wakai, Akihisa Inoue
Abstract: Spark plasma sintering (SPS), as a developed rapid sintering technique, has a great potential for producing larger metallic glassy alloy specimens in a variety of shapes than those fabricated by casting methods, and can readily produce composites by dispersing crystalline particles in the glassy matrix. In this study, the Ni52.5Nb10Zr15Ti15Pt7.5 bulk metallic glassy matrix composites dispersed homogeneously with ceramics ZrO2 particulates were fabricated by the SPS process. The plastic ductility of the Ni52.5Nb10Zr15Ti15Pt7.5 glassy matrix composites was improved by adding ZrO2 particulates into the glassy alloy. The matrix of the fabricated composites maintained a glassy phase after the SPS process.
Authors: K. Ota, K. Hajlaoui, G. Vaughan, Marco Di Michiel, Dmitri V. Louzguine-Luzgin, Akihisa Inoue, Alain Reza Yavari
Authors: Jean-Louis Uriarte, Dmitri V. Louzguine-Luzgin, Alain Reza Yavari
Authors: Qing Sheng Zhang, Wei Zhang, Dmitri V. Louzguine-Luzgin, Akihisa Inoue
Abstract: A new series of bulk metallic glasses were developed by addition of Fe into the ternary Zr60Cu30Al10 alloy. Although Fe-Cu element pair shows distinct immiscibility with a large positive heat of mixing, substitution of Fe for Cu significantly improves the glass-forming ability of the ternary Zr60Cu30Al10 alloy. The critical diameter for glass-formation increases from 8 mm for Zr60Cu30Al10 alloy to 20 mm for Zr60Cu25Fe5Al10 and Zr62.5Cu22.5Fe5Al10 alloys. As compared with the ternary Zr60Cu30Al10 alloy, the new quaternary Zr-Cu-Fe-Al alloys show lower liquidus temperatures. The Zr60Cu25Fe5Al10 and Zr62.5Cu22.5Fe5Al10 alloys, the best BMG-formers in this alloy system, are found to locate very near a Zr-Cu-Fe-Al eutectic point. The new Zr-Fe-Cu-Al bulk metallic glasses exhibit high strength of about 1700 MPa. The plastic strain increases from 7.8% to 11.3% with increasing the content of Fe from 0 to 12.5%. The finding of a Ni-free Zr-based bulk glassy alloy with the extremely high glass-forming ability is expected to extend the future application of bulk metallic glasses.
Authors: Lj. Ouyang, Dmitri V. Louzguine-Luzgin, Hisamichi Kimura, T. Ohsuna, Srinivasa Ranganathan, Akihisa Inoue
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