The effect of Mn on the mechanical behavior of Al alloys

Manganese has been known to be an alloying element of Al alloys that contributes to uniform deformation. Recently, it was found that as the manganese content increases over 0.5 wt.% in such aluminum alloys as the 6000, and 7000 series alloys, both yield and ultimate tensile strength increase signifi...

Full description

Saved in:
Bibliographic Details
Published in:Metals and materials (Seoul, Korea) Korea), 2000-02, Vol.6 (1), p.13-16
Main Authors: Nam, Soo Woo, Lee, Duck Hee
Format: Article
Language:English
Subjects:
Alloying elements
Alloys
Aluminum alloys
Aluminum base alloys
Corrosion fatigue
Corrosion resistance
Cross slip
Deformation
Dispersion
Dispersions
Ductility
Fatigue strength
Grain size
Low cycle fatigue
Manganese
Mechanical properties
Recrystallization
Tensile strength
Ultimate tensile strength
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Manganese has been known to be an alloying element of Al alloys that contributes to uniform deformation. Recently, it was found that as the manganese content increases over 0.5 wt.% in such aluminum alloys as the 6000, and 7000 series alloys, both yield and ultimate tensile strength increase significantly without decreasing ductility. The added manganese forms a manganese dispersoid of Al6Mn. This dispersoid has an incoherent structural relationship with respect to the matrix, FCC, in retarding the motion of dislocations that increase strength. Once the dislocation is blocked by the dispersoid, it tends to change the slip system by means of cross-slip. This cross-slip allows the deformation to maintain uniformly good ductility. TEM observation has proven the above mentioned activities of dislocation by analyzing the characters of the dislocations around and away from the dispersoids. Adding manganese to aluminum alloys not only enhances tensile strength but also significantly improves low-cycle fatigue resistance. Corrosion resistance is also measurable improved by the addition of manganese. After extrusion, the recrystallization is also retarded so that a very small grain size is maintained, contributing to an improvement in the mechanical properties.
ISSN:1225-9438
1598-9623
2005-4149
DOI:10.1007/BF03026339