Existence of hexagonal tabular β-phase in Al-Mg-Si alloys containing noble metal elements

0573471 - ÚPT 2024 RIV NL eng J - Journal Article
Tsuchiya, T. - Uttarasak, K. - Lee, S. - Ahmed, A. - Mikmeková, Šárka - Nishimura, K. - Nunomura, N. - Shimizu, K. - Hirayama, K. - Toda, H. - Yamaguchi, M. - Tsuru, T. - Nakamura, J. - Ikeno, S. - Matsuda, K.
Existence of hexagonal tabular β-phase in Al-Mg-Si alloys containing noble metal elements.
Materials Today Communications. Roč. 35, June (2023), č. článku 106198. ISSN 2352-4928. E-ISSN 2352-4928
Institutional support: RVO:68081731
Keywords : Al-Mg-Si alloy * Over-aging * Mg2Si * Microstructure * Novel metal elements * Transmission electron microscopy
OECD category: Materials engineering
Impact factor: 3.8, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S2352492823008899

The hexagonal tabular ß-Mg2Si phase (hex-ß) co-existed with conventional truncated octagonal shaped ß-Mg2Si (con-ß) in Al-1.0 mass% Mg2Si alloy containing a small amount of noble metal elements (NMEs, Cu, Pt, Ag, Pd or Au) at the over-aged condition of 673 K. As this hex-ß laid on the {111} plane of the Al matrix, and its six edges were parallel to 110ß, its orientation relationship with the Al-matrix is as follows:{111Al //{111}ß and 110Al //110β was the same as our previous report of (hex-ß) in an ingot of Al-1.0 mass%Mg2Si- 0.5 mass% Cu alloy just homogenized at 723 K for 4 days, without cold-rolling, solution heat treatment, and aging. There is no significant difference in the lattice parameter of ß-Mg2Si by added NMEs. The formation of hex-ß was suggested to be related to defects in the Al-matrix, for example, by segregation of NMEs at the interface, altering the stacking fault energy, or introducing partial dislocations.
Permanent Link: https://hdl.handle.net/11104/0343909