Unified Interpretations of Two Kinds of Needle-Shaped Precipitates Using Transmission Electron Microscopy and Small-Angle Neutron Scattering in Aged Al–Mg2Si(-Cu) Alloys
Amalina Aina Kaharudin, Masato Ohnuma, Seungwon Lee, Taiki Tsuchiya, Yuuki Asada, Ken-ichi Ikeda, Kazuki Ohishi, Jun-ichi Suzuki, Kenji Matsuda, Tomoyuki Homma
TL;DR
This study uses electron microscopy and neutron scattering to analyze needle-shaped precipitates in aluminum alloys, revealing a new phase that affects hardness.
Contribution
The study identifies and characterizes a new precipitate phase (R phase) in Al–Mg2Si alloys and shows how Cu addition influences its formation and properties.
Findings
The R phase forms as a needle-shaped precipitate and partially aligns along the axis of random-type precipitates.
Cu addition stabilizes and promotes the growth of the R phase, enhancing hardness in the alloy.
The R phase is present even in Cu-free alloys but with lower volume fraction and slower growth.
Abstract
This study investigates the nanostructural properties of pseudo-binary Al–1.0Mg2Si (mass%) alloys with and without 0.5Cu using transmission electron microscopy (TEM) and small-angle neutron scattering (SANS). The TEM results show that both alloys exhibit extra electron diffraction spots related to MgSiMg second clusters at peak-aged conditions. High-resolution TEM images have revealed that the second cluster exists as a needle-shaped precipitate that is shorter and thicker than the β″ phase. We found that the second cluster, which we referred to as the R phase in this paper, is more likely to form partially along the longitudinal axis of a random-type precipitate. Thus, the atomic arrangement in the random-type precipitate is not completely random. SANS is used to quantify the size and volume fraction of the observed needle-shaped precipitates since the R phase is difficult to observe…
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Taxonomy
TopicsAluminum Alloy Microstructure Properties · Microstructure and mechanical properties · Aluminum Alloys Composites Properties