Cavitation-resistant intergranular precipitates enhance creep performance of θ′-strengthened Al-Cu based alloys

Rakhmonov, Jovid; Bahl, Sumit; Shyam, Amit; Dunand, David C.

doi:10.1016/j.actamat.2022.117788

Cited by 45 publications

(9 citation statements)

References 39 publications

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“…Mn and Ag show a strong segregation tendency at the Al/θ′-Al 2 Cu interface, which provides powerful chemical bonds. Solute segregation can compensate for a lattice mismatch at the semi-coherent interface between Al and θ′-Al 2 Cu; the chemical interaction of solutes at the interface helps reduce the interface energy [ 14 ]. In the kinetics aspect, the thermal diffusion coefficient of the Mn atom is much lower than that of other atoms, which means that if it were introduced into the alloys, it would diffuse very slowly at high temperatures and could hinder the diffusion of other atoms, which is what we would expect, because it serves as a “coarsening barrier” and helps to hinder the suppression of the freely available vacancies in the Al matrix for Cu jumping (which leads to the coarsening of θ′-Al 2 Cu) [ 66 , 69 ].…”

Section: Resultsmentioning

confidence: 99%

“…After solution–aging, the fine and dispersed θ′-Al 2 Cu metastable phase precipitates in the Al-Cu alloy matrix, which has a semi-coherent relationship with the matrix and can effectively block dislocation movement and pin grain boundaries, thus improving the high-temperature strength and creep resistance of the alloy [ 6 , 7 ]. For Al-Cu alloys, the rich microstructure of θ′-Al 2 Cu provides the best strength and thermal stability for high-temperature applications [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. θ′-Al 2 Cu has a four-angle distorted fluorite structure (space group I4/MMM) where a = 0.404 nm and C = 0.580 nm.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys

Fu,

Yang,

Wang

et al. 2024

Materials

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This paper mainly investigated the effect of the Mn/Ag ratio on the microstructure and room temperature and high-temperature (350 °C) tensile mechanical properties of the as-cast and heat-treated Al-6Cu-xMn-yAg (x + y = 0.8, wt.%) alloys. The as-cast alloy has α-Al, Al2Cu, and a small amount of Al7Cu2 (Fe, Mn) and Al20Cu2 (Mn, Fe)3 phases. After T6 heat treatment, a massive dispersive and fine θ′-Al2Cu phase (100~400 nm) is precipitated from the matrix. The Mn/Ag ratio influences the quantity and size of the precipitates; when the Mn/Ag ratio is 1:1, the θ′-Al2Cu precipitation quantity reaches the highest and smallest. Compared with the as-cast alloy, the tensile strength of the heat-treated alloy at room temperature and high temperature is greatly improved. The strengthening effect of the alloy is mainly attributed to the nanoparticles precipitated from the matrix. The Mn/Ag ratio also affects the high-temperature tensile mechanical properties of the alloy. The high-temperature tensile strength of the alloy with a 1:1 Mn/Ag ratio is the highest, reaching 135.89 MPa, 42.95% higher than that of the as-cast alloy. The analysis shows that a synergistic effect between Mn and Ag elements can promote the precipitation and refinement of the θ′-Al2Cu phase, and there is an optimal ratio (1:1) that obtains the lowest interfacial energy for co-segregation of Mn and Ag at the θ′/Al interface that makes θ′-Al2Cu have the best resistance to coarsening.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys

Fu,

Yang,

Wang

et al. 2024

Materials

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“…In addition, at high temperatures, the grain boundary will produce viscous flow under stress, and the grain may slide along the grain boundary. At low stresses, grain size is the main factor affecting diffusion creep, and the type and volume fraction of grain boundary precipitates play an important role in the rate of diffusional creep [17]. Therefore, the phenomenon of fine grain delamination is not conducive to high-temperature strength.…”

Section: Resultsmentioning

confidence: 99%

Arc additive remanufacturing of a new type of Al–Cu–Ni aviation case: Microstructure and high-temperature properties under T6 heat treatment

Dai

Zhang

Miao

et al. 2023

Science and Technology of Welding and Joining

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A new Al-Cu-Ni alloy was repaired by arc additive remanufacturing and T6 heat treatment. The results show that the grain size in the upper part of the weld is slightly larger than that in the lower part, and the whole distribution is uniform without delamination. The orientation of grains in the weld is disordered, and most of them are stable crystal structures with a large angle. The average tensile strength at 300°C is 148.3 MPa, the yield strength is 106.6 MPa and the elongation is 10.5%. δ-Al 3 CuNi and γ -Al 7 Cu 4 Ni increase the strength of grain boundary, and the strength of θ and θ are dispersed from the α-Al matrix during aging, which are the main reasons for obtaining high-temperature properties.

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“…More recently, Chakrabarti et al 5 suggested that this lath-shaped phase could be a precursor of the Q phase, named Q′. The addition of copper has also been reported as an element that reduces the negative effects of natural aging [ 5 , 6 , 7 ]. Recent studies by Gökçe et al [ 8 , 9 ] on Al-Cu and Al-Cu-Mg alloys revealed that high-strength, Al-based powder metallurgy alloys were developed with good microstructures from the premixed elemental components with an increase in the strength of the base Al powder by 5-times from 84 MPa to 466 MPa.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu Content on the Alloy Tensile Properties of Al-Cu Based Alloys Tested at 25 °C and 250 °C: Application of the Concept of Quality Index

Girgis

Samuel

et al. 2023

Materials

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The present work was performed on three versions of a newly developed alloy coded T200 containing 6.5% Cu, 0.1% Fe, 0.45% Mg, and 0.18% Zr in addition to A319 and A356 alloys (grain refined and Sr-modified). Tensile bars were subjected to 13 different heat treatments prior to testing at either 25 °C or 250 °C. The tensile data were analyzed using the quality index method. The results obtained showed that, due to the high copper content in the T200 alloy coupled with proper grain refining, the alloy possesses the highest quality as well as improved resistance to softening when tested at 250 °C among the five alloys. The results also demonstrate the best heat treatment condition to maximize the use of the T200 alloy for automotive applications. Grain-refined alloy B, treated in the T6 temper and tested at 250 °C, exhibited the best combination of the four tensile parameters, i.e., UTS, YS, %El, and Q-values: 308 MPa, 304 MPa, 2.3%, and 352 MPa, respectively, which are comparable with those obtained from the 356 alloy: 309 MPa, 305 MPa, 2.8%, and 375 MPa in the same order.

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Cavitation-resistant intergranular precipitates enhance creep performance of θ′-strengthened Al-Cu based alloys

Cited by 45 publications

References 39 publications

Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys

Effect of Mn/Ag Ratio on Microstructure and Mechanical Properties of Heat-Resistant Al-Cu Alloys

Arc additive remanufacturing of a new type of Al–Cu–Ni aviation case: Microstructure and high-temperature properties under T6 heat treatment

Effect of Cu Content on the Alloy Tensile Properties of Al-Cu Based Alloys Tested at 25 °C and 250 °C: Application of the Concept of Quality Index

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