|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Bulk Metallic Glasses XIX
||Observation of the Invar Effect by In-situ X-ray Diffraction in Fe-based Bulk Metallic Glasses
||Alexander Firlus, Mihai Stoica, Stefan Michalik, Robin E Schäublin, Jörg F Löffler
|On-Site Speaker (Planned)
An anomalously low coefficient of thermal expansion that suddenly increases around the Curie temperature is universally observed in ferromagnetic Fe-based bulk metallic glasses (BMGs). This effect is known as Invar effect and is rare to find in crystalline alloys. While many studies have shown the Invar effect exists in Fe-based BMGs at the macroscopic scale, there is little understanding on how the Invar effect manifests at the atomic scale of amorphous materials.
In this work we studied the Invar effect of quaternary BMGs by in-situ high-energy X-ray diffraction. All diffraction halos contract with increasing temperature and show a transition in the contraction rate around the Curie temperature. Combining atomic-scale information with macroscopic dilatometry and magnetometry, we improve on the understanding of the Invar effect in amorphous materials.
||Magnetic Materials, Other,