Abstract
The effect of Cu and Zr additions and annealing temperature on electrical conductivity and hardness of the Al–1.5 wt.% Mn alloy in the form of as-cast ingots and cold rolled sheets has been investigated. It is shown that due to the formation of low alloyed aluminum solid solution and Al20Cu2Mn3 and Al3Zr (L12) phase nanoparticles, the 1.5MnCuZr alloy is superior to the base 1.5Mn alloy both in the hardness (up to two times) and electrical conductivity (up to 30%) after metal processing and annealing. A new alloy can be considered as a replacement for existing 6201 type conductive alloys.
Highlights
IntroductionWrought AA3003 type aluminum alloys containing 1%–1.5% Mn are characterized by high manufacturability (in particular, in the manufacture of sheet metal) and good corrosion resistance [1,2,3,4].Due to the manganese addition their strength is higher in comparison with unalloyed aluminum (1xxx series)
Wrought AA3003 type aluminum alloys containing 1%–1.5% Mn are characterized by high manufacturability and good corrosion resistance [1,2,3,4]
It was found that the entire amount of manganese, as well as most of copper and zirconium, dissolved in the aluminum solid solution during solidification, which allowed both high alloy processability during cold rolling and the formation of Al20 Cu2 Mn3 and Al3 Zr dispersoids during annealing
Summary
Wrought AA3003 type aluminum alloys containing 1%–1.5% Mn are characterized by high manufacturability (in particular, in the manufacture of sheet metal) and good corrosion resistance [1,2,3,4].Due to the manganese addition their strength is higher in comparison with unalloyed aluminum (1xxx series). Alloys with the addition of zirconium are the most suitable for solving this problem [16,17,18,19] This element (usually in an amount of 0.3%–0.4%) is an effective hardener in aluminum alloys due to the formation of Al3 Zr (L12 ) phase secondary precipitates, which are less than 10 nm in diameter [20,21]. These nanoparticles are formed during annealing via decomposition of the supersaturated as-cast (Al). The strength of the alloys does not exceed 250 MPa, which is lower than that of the 6xxx alloys that are used as conductive materials
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