The effect of iron and manganese on the recrystallization behavior of hot-rolled and solution-heat-treated aluminum alloy 6013

Journal Article · Mon Jan 01 00:00:00 EST 1996 · Metallurgical Transactions, A

OSTI ID:203515

Jeniski, Jr, R A ^[1]; Thanaboonsombut, B ^[2]; Sanders, Jr, T H ^[3]

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1. Alcoa Technical Center, Alcoa Center, PA (United States)
2. National Metal and Materials Technology Center, Bangkok (Thailand)
3. Georgia Inst. of Technology, Atlanta, GA (United States). School of Materials Science and Engineering

The influence of manganese and iron addition on the recrystallization behavior of a hot-rolled Al-Mg-Si-Cu alloy has been investigated. In the as-cast ingot, some manganese remains in supersaturated solid solution and, during the preheating step, precipitates as fine (0.1 to 0.3 {micro}m) dispersoids {alpha}-Al{sub 12}Mn{sub 3}Si and {alpha}(AlFeMnSi), depending on the local iron content. The presence of the dispersoids increases the alloy`s resistance to recrystallization. The remaining manganese along with iron forms coarse (30 to 100 {micro}m) {alpha}(AlFeMnSi) phases in the interdendritic channels upon solidification. During rolling, these coarse phases are broken up and the matrix surrounding the phases is highly strained. The highly strained regions around the precipitates are preferential sites for the nucleation and growth of new, strain-free, recrystallized grains. Decreasing the iron content decreases the amount of coarse {alpha}(AlFeMnSi) constituent phase and increases the recrystallization resistance of the alloy for a given concentration of manganese. For iron-free alloys, coarse {alpha}-Al{sub 12}Mn{sub 3}Si phase forms during solidification. The increased recrystallization resistance is attributed to the lower probability for particle-stimulated recrystallization. In this research, alloys containing varying amounts of manganese and iron with levels of magnesium, silicon, and copper consistent with the nominal composition of 6013 were hot deformed and solution heat treated to produce microstructures ranging from fully recrystallized to unrecrystallized.

• OSTI ID: 203515
• Journal Information: Metallurgical Transactions, A, Vol. 27, Issue 1; Other Information: PBD: Jan 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
33 ADVANCED PROPULSION SYSTEMS
ALUMINIUM BASE ALLOYS
RECRYSTALLIZATION
MAGNESIUM ALLOYS
SILICON ALLOYS
COPPER ALLOYS
IRON
METALLURGICAL EFFECTS
MANGANESE
AEROSPACE INDUSTRY
MATERIALS
INTERMETALLIC COMPOUNDS
SOLID SOLUTIONS
PRECIPITATION
NUCLEATION
GRAIN GROWTH
HOT WORKING
HEAT TREATMENTS
CHEMICAL COMPOSITION