• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Probing the atomic structure and physical properties of super-cooled liquid alloys during vitrification

Research Project

Project/Area Number 15K18201
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Physical properties of metals/Metal-base materials
Research InstitutionTohoku University

Principal Investigator

G コンスタンティノス  東北大学, 原子分子材料科学高等研究機構, 助教 (30526794)

Project Period (FY) 2015-04-01 – 2017-03-31
Project Status Discontinued (Fiscal Year 2016)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywordsアモルファス / 金属ガラス / 準結晶
Outline of Annual Research Achievements

The scope of this work is to uncover how the structure of liquid metals changes in their pathway to vitirification. A metallic glass is formed when a melted alloy is cooled rapidly enough so that crystallization is avoided upon solidification. However, the way the atomic structure of the liquid converts to the glassy structure is generally unknown, mainly because the acquisition of structural information in the supercooled liquid regime is hindered by crystallization. In this work we were able to overcome this limitation and achieve in-situ vitrification of various metallic alloys in a high energy synchrotron beam using a state of the art aerodynamic levitation technique. This important achievement allowed the acquisition of structural data in the whole range from the liquid through the super-cooled liquid and the glassy state offering a unique possibility to study the structural evolution during vitrification. The results indicate the existence of three non-crystalline regimes in the liquid’s pathway to vitrification. The structural evolution below the melting temperature deviates from that of the liquid, pointing to a crossover in the evolution of the liquid’s structure. The local order in the short and medium range (SRO and MRO) increases rapidly as the supercooled liquid approaches the glass transition temperature Tg, below which the structure “freezes”. The structural rearrangements in the supercooled liquid are found to be correlated with a rapid increase in viscosity of metallic liquid upon cooling.

Report

(2 results)
  • 2016 Annual Research Report
  • 2015 Research-status Report
  • Research Products

    (7 results)

All 2016 2015

All Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Acknowledgement Compliant: 2 results,  Open Access: 1 results) Presentation (5 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Journal Article] Mechanically induced waves in metallic glass foils2016

    • Author(s)
      N. Panagiotopoulos, M. Yousfi, K. Georgarakis, A.R. Yavari
    • Journal Title

      Materials and Design

      Volume: 90 Pages: 1110-1114

    • DOI

      10.1016/j.matdes.2015.10.149

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Microstructure and mechanical behavior of metallic glass fiber reinforced Al alloy matrix composites2016

    • Author(s)
      Z. Wang, K. Georgarakis, K. Nakayama, Y. Li, A. Tsarkov G. Xie, D. Dudina D. Louzguine, A.R. Yavari
    • Journal Title

      Scientific Reports

      Volume: 24384 Issue: 1 Pages: 1-11

    • DOI

      10.1038/srep24384

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] The structural pathway of metallic liquids to vitrification2016

    • Author(s)
      K. Georgarakis
    • Organizer
      The 11th International Conference on Bulk Metallic Glasses
    • Place of Presentation
      St. Louis, USA
    • Year and Date
      2016-06-05
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Tracing the Pathway of Metallic Liquids to Amorphization (poster)2016

    • Author(s)
      K. Georgarakis
    • Organizer
      AIMR International Symposium 2016 (AMIS2016), Sendai, Japan
    • Place of Presentation
      Sendai, Japan
    • Year and Date
      2016-02-22
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Structural evolution during vitrification of metallic liquids2016

    • Author(s)
      K. Georgarakis
    • Organizer
      International Workshop on Structure and Dynamics of Glasses
    • Place of Presentation
      Tohoku University, Sendai, Japan
    • Year and Date
      2016-02-21
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Probing the structure of glass forming metallic liquids during vitrification2015

    • Author(s)
      K. Georgarakis
    • Organizer
      157th Meeting of The Japan Institute of Metals and Materials
    • Place of Presentation
      Fukuoka, Japan
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research
  • [Presentation] Tracing the Pathway of Liquid Alloys to Vitrification2015

    • Author(s)
      K. Georgarakis
    • Organizer
      International Symposium on Metastable and Nanostructured Materials (ISMANAM 2015)
    • Place of Presentation
      Paris, France
    • Year and Date
      2015-07-13
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited

URL: 

Published: 2015-04-16   Modified: 2018-01-16  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi