Kim, Man-Ho Suh, Jin-Yoo Fleury, Eric Han, Su Gyeong Hong, Kyung Tae 2024-01-19T22:02:29Z 2024-01-19T22:02:29Z 2021-09-03 2018-08-28 2045-2322 https://pubs.kist.re.kr/handle/201004/121020 The ultra-small angle neutron scattering (USANS) measures the microscale structure of heterogeneity and the scattering from rough surfaces with small scattering volumes can be neglected. But this is not true in amorphous alloys. The small angle scattering from such surfaces is not negligible, regardless of scattering volume. However, we demonstrate that the unwanted rough surfaces can be utilized to determine the homogeneity and mass density of amorphous metallic glasses using the USANS and surface neutron contrast matching technique. The power law scattering of the homogeneous Cu50Zr50 amorphous alloy disappeared under the surface contrast-matched environment, a mixture of hydrogenated/deuterated ethanol having low surface tension against the metallic alloys, indicating that the scattering originated not from its internal structure but from the rough surface. This confirms the structural homogeneity not only at the atomic level but also on a larger scale of micrometer. On the other hand, the crystallized Cu50Zr50 alloy showed strong power-law scattering under the matching environment due to the structural heterogeneity inside the alloy. This technique can apply to the bulk samples when the transmission is high enough not causing multiple scattering that is easily detected with USANS and when the surface roughness is dominant source of scattering. English NATURE PUBLISHING GROUP AMORPHOUS-ALLOYS X-RAY IMPERFECTIONS DECOMPOSITION PHASE Structural homogeneity and mass density of bulk metallic glasses revealed by their rough surfaces and ultra-small angle neutron scattering (USANS) Article 10.1038/s41598-018-30333-9 1 SCIENTIFIC REPORTS, v.8 SCIENTIFIC REPORTS 8 scie scopus 000442917500058 2-s2.0-85052373708 Multidisciplinary Sciences Science & Technology - Other Topics Article AMORPHOUS-ALLOYS X-RAY IMPERFECTIONS DECOMPOSITION PHASE Ultra-small angle neutron scattering KIST-USANS Bulk metallic glasses rough surface Cu50Zr50