Effect of Cu content on the mechanical properties of an Al–Cu–Mg–Ag alloy

“…As a result, the elongation of the A 3 alloy (about 1.1%) is much less than that of the A 2 alloy (about 6.3%), and hence, the UTS is also decreased. In case of tension at 300°C, both the YS and UTS are increased with Cu content due to the increased precipitation hardening with the Cu content, consistent with the results in [28]. As concluded above, high temperature strength overridingly depends on the precipitation behavior during solutionizing.…”

Section: Contribution To Tension Propertiessupporting

confidence: 86%

Uneven Precipitation Behavior during the Solutionizing Course of Al‐Cu‐Mn Alloys and Their Contribution to High Temperature Strength

Chen

Liao

2018

Advances in Materials Science and Engineering

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e dispersoid precipitation behavior during the solutionizing and aging of Al-xwt.%Cu-1.0 wt.% Mn alloys (x � 2.0, 4.5, and 7.5) and contribution to mechanical properties were investigated using tensile testing and microstructural characterization. A shell-core structure of primary α-Al dendrites is found in Al-Cu-Mn alloys, in which the Cu content in the shell is higher than that in the core. e area of shell zone (Cu-rich) increases with an increase in Cu content in the alloy. Large amounts of fine dispersoid Al-Cu-Mn particles precipitate in solution. An alloy with low Cu content results in only the T Mn (Al 20 Cu 2 Mn 3 ) particles being precipitated. However, in an alloy with high Cu content, AlCu 3 Mn 2 particles are first found to precipitate beside T Mn . However, this precipitation behavior is uneven. e precipitation zones in the solution microstructure are consistent with the Cu-rich regions in the as-cast microstructure. A number of fine particles (dozens nanometer in size) are first found to precipitate on the rod-like T Mn particles during the aging phase. e redissolution and granulation of the eutectic CuAl 2 phase during the solutionizing process result in the formation of particle-free bands between the precipitation zones. e tension test at 300°C demonstrates that the increase in high temperature strength is due to the dispersoid precipitation during solutionizing, and the precipitation behavior in the aging phase has little or no effect, however, largely improves the tensile strength at room temperature. High temperature strength is significantly increased with an increase in Cu content, which correlates to an increase in number and decrease in size of T Mn and AlCu 3 Mn 2 particles.

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“…These elements modify the phase diagram by changing the eutectic composition and temperature. The addition of copper in aluminum alloys results in the formation of Al-2 Cu phase and allows precipitate hardening of the alloy (Xiao et al, 2002). Tensile strength and hardness values generally increase; however, ductility is reduced with copper addition.…”

Section: Introductionmentioning

confidence: 99%

Effects of Copper and Magnesium on Phase Formation Modeling and Mechanical Behavior in AL-CU-MG Alloys

Nafsin¹,

Rashed²

2013

Int J Automot Mech Eng

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The current work emphasizes the establishment of a relationship between microstructure, and copper and magnesium addition in aluminum based alloys. Aluminum alloys containing 4 and 6% copper and 0.50 and 1% magnesium were cast from commercially pure aluminum ingots and homogenized at 400 o C. Images of the microstructures of the as-cast and homogenized alloys were acquired, and image analysis of the phases was performed on the acquired images to obtain area fractions of the phases present in the microstructure. Using the CALPHAD modeling method, thermodynamic modeling of the alloys was carried out in the equilibrium cooling condition since after homogenization for a prolonged time the alloys should reach a close to equilibrium cooling condition. Phase fractions predicted in modeling were matched closely with image analysis data, given that phases present in the homogenized alloys can be interpreted through modeling in the equilibrium cooling condition. EDX analysis of the samples identified the phases present in the alloys as Al 2 Cu, Mg 2 Si and Al 7 Cu 2 Mg. With increasing copper content, it was found both in modeling and experimentally that the amount of Al 2 Cu phase increased, which improved the hardness values of the alloys. However, in the homogenized condition, the hardness values slightly decreased compared to those of the as-cast condition due to retention of a lower fraction of Al 2 Cu phase in the homogenized condition. This was ascertained in the modeling of the alloys. In contrast, Mg 2 Si and Al 7 Cu 2 Mg phases were formed when magnesium was added in the predefined amount; however, these phases were not found to be effective at improving the hardness of the alloys, and the hardness values were barely modified. Apparently, the hardness enhancement after magnesium addition occurred due to a solute effect. To observe the phase effect of magnesium in aluminum alloys, binary alloys of aluminum-magnesium should be cast.

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Effect of Cu content on the mechanical properties of an Al–Cu–Mg–Ag alloy

Cited by 85 publications

References 16 publications

Effect of copper and silicon content on mechanical properties in Al–Cu–Si–Mg alloys

Effect of copper and silicon content on mechanical properties in Al–Cu–Si–Mg alloys

Uneven Precipitation Behavior during the Solutionizing Course of Al‐Cu‐Mn Alloys and Their Contribution to High Temperature Strength

Effects of Copper and Magnesium on Phase Formation Modeling and Mechanical Behavior in AL-CU-MG Alloys

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