Effect of preheat temperature on the orientation relationship of (Mn,Fe)Al{sub 6} precipitates in an AA 5182 aluminum-magnesium alloy

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(94)00261-F· OSTI ID:27892

Ratchev, P; Verlinden, B; Van Houtte, P ^[1]

---

1. Katholicke Univ. Leuven (Belgium). MTM Dept.

The pressure on the automobitive industry to produce lighter cars with reduced fuel consumption causes a demand for new materials able to replace steel for car body panels. Some of the materials considered for this are aluminium alloys, especially Al-Mg alloys of the 5xxx series. The precipitation of the (Mn,Fe)Al{sub 6} phase during preheating of a commercial AA 5182 Al-Mg alloy was studied by means of scanning electron microscopy, transmission electron microscopy and selected area electron diffraction. The existence of two different morphologies with low and high aspect ratio (called here rhomboidal and platelike) was confirmed. The influence of preheating parameters on the precipitation was found to be close to the one known for Al-Mn alloys. It was found that the platelike dispersoids bear orientation relationships with the matrix of type [100]{sub m}{parallel}[{bar 2}10]{sub pp} and (0{bar 1}1){sub m}{parallel}(001){sub pp}, which are not yet reported in the literature. On the other hand it was shown that rhomboidal precipitates do not follow any orientation relationship with the matrix. The more harmful influence on recrystallization and hot ductility of the rhomboidal precipitates compared to the platelike ones is discussed.

• OSTI ID: 27892
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 2 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
AUTOMOBILES
EFFICIENCY
HEAT TREATMENTS
IRON ADDITIONS
MAGNESIUM ALLOYS
MANGANESE ADDITIONS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MORPHOLOGY
PRECIPITATION
SAMPLE PREPARATION