Coincidence of collective relaxation anomaly and specific heat peak in a bulk metallic glass-forming liquid

Journal Article · Tue Jul 21 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.92.024202· OSTI ID:1207052

Jaiswal, Abhishek ^[1]; Podlesynak, Andrey ^[2]; Ehlers, Georg ^[2]; Mills, Rebecca ^[2]; O'Keeffe, Stephanie ^[3]; Stevick, Joseph ^[3]; Kempton, James ^[3]; Jelbert, Glenton ^[3]; Dmowski, Wojciech ^[4]; Lokshin, Konstantin ^[4]; Egami, Takeshi ^[4]; Zhang, Yang ^[1]

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1. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)
2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
3. Liquidmetal Technologies, Rancho Santa Margarita, CA (United States)
4. Univ. of Tennessee, Knoxville, TN (United States)

The study of multicomponent metallic liquids' relaxational behavior is still the key to understanding and improving the glass-forming abilities of bulk metallic glasses. Here, we report measurements of the collective relaxation times in a melted bulk metallic glass (LM601Zr₅₁Cu₃₆Ni₄Al₉) in the kinetic regime (Q: 1.5–4.0Å^–1) using quasielastic neutron scattering. The results reveal an unusual slope change in the Angell plots of this metallic liquid's collective relaxation time around 950°C, beyond the material's melting point. Measurement of specific heat capacity also reveals a peak around the same temperature. Adams-Gibbs theory is used to rationalize the coincidence, which motivates more careful experimental and computational studies of the metallic liquids in the future.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC05-00OR22725; NRC-HQ-12-G-38-0072; RB14187
• OSTI ID: 1207052
• Alternate ID(s): OSTI ID: 1198712
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Vol. 92, Issue 2; ISSN 1098-0121
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE