Improving Thermal Stability in Cu-Containing Al-Mg-Si Alloys by Precipitate Optimization

被引：0

作者：

Calin D. Marioara

Sigmund J. Andersen

Jostein Røyset

Oddvin Reiso

Sverre Gulbrandsen-Dahl

Tor-Erik Nicolaisen

Inge-Erland Opheim

Jan Fredrik Helgaker

Randi Holmestad

机构：

[1] SINTEF Materials and Chemistry,

[2] Hydro Aluminium R&D Sunndal,undefined

[3] Norwegian University of Science and Technology (NTNU),undefined

[4] SINTEF Raufoss Manufacturing AS,undefined

[5] Steertec Raufoss AS,undefined

[6] DNV GL,undefined

来源：

Metallurgical and Materials Transactions A | 2014年 / 45卷

关键词：

Habit Plane; Precipitate Type; High Number Density; Precipitate Microstructure; Metastable Precipitate;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

It is demonstrated that good thermal stability in Al-Mg-Si-Cu aluminum alloys correlates with a high density of fine lath-shaped, Cu-containing, disordered L-precipitates. Alloys optimized for L retained hardness above 90 HV after 3 weeks over-aging at 473 K (200 °C). Further improvement was achieved by substituting Si by Ge in one alloy. High-angle annular dark-field scanning transmission electron microscopy showed that at peak-hardness conditions, L coexists with more common needle-shaped precipitates, often with Cu-enriched interfaces.

引用

页码：2938 / 2949

页数：11

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