Ultrafast heating of metallic glasses reveals disordering of the amorphous structure. (1st February 2016)

• Record Type: Journal Article
• Authors: Küchemann, Stefan; Samwer, Konrad
• Is Part Of: Acta materialia. Volume 104(2016)
• Page Start: 119
• Page End: 124
• Publication Date: 2016-02-01
• Subjects: Metallic glasses -- Supercooled liquid -- Liquid–liquid phase transition -- Specific heat capacity -- Synchrotron measurements; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2015.11.039
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: Studies of the transition from the supercooled liquid into the high temperature liquid of a glass forming metal is commonly hindered by incipient crystallization processes. In this contribution we show that a metallic glass exhibits a significant sudden increase in the specific heat while crossing the transition from the supercooled liquid into the high temperature liquid without crystallizing. At this increase, high temporal resolution X-ray studies show that the liquid structure changes and the crystallization behavior also deviates from the common Zr2 (Cu, Al)-phase formation. We associate the increase in specific heat capacity with the disordering of the amorphous structure like a scenario of a first order liquid–liquid phase transition. Graphical abstract: