Microstructure, Hardness Evolution, and Thermal Stability Mechanism of Mechanical Alloyed Cu-Nb Alloy during Heat Treatment

Lei, Ruoshan; Wang, Mingpu; Xu, Shiqing; Wang, Huanping; Chen, Guangrun

doi:10.3390/met6090194

Cited by 8 publications

(7 citation statements)

References 35 publications

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“…The ultra-high yield and ultimate tensile strengthsare achieved simultaneously with good ductility and strain hardening of the NC Cu-1at.% Nb than that of the NC Cu have been observed [7]. These improved properties are the effect of smaller grain size (it has been found that Nb atoms stabilize effectively grain size in Cu [82,83]), solid solution hardening, andlattice stresses associated with supersaturation of Nb in Cu matrix.GSFE shows thatall energies decrease then in Cu and SFE/USFE is lowered by Nb as well. Partial dislocation may be emitted more easily due to Nb content in Cu matrix.…”

Section: Stacking Fault Energies In Copper In 4d Transition Metal Alloysmentioning

confidence: 90%

Generalised stacking fault energies of copper alloys - density functional theory calculations

Muzyk

Kurzydłowski

2019

J min metall B Metall

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Generalised stacking fault energies of copper alloys have been calculated using density functional theory. Stacking fault energy of copper alloys is correlated with the d-electrons number of transition metal alloying element. The tendency to twiningis also modified by the presence of alloying element in the deformation plane. The results suggest that Cu-transition metal alloys with such elements as Cr, Mo, W, Mn, Re are expected to exhibit great work hardening rate due to the tendency to emission of the partial dislocations.

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Section: Stacking Fault Energies In Copper In 4d Transition Metal Alloysmentioning

confidence: 90%

Generalised stacking fault energies of copper alloys - density functional theory calculations

Muzyk

Kurzydłowski

2019

J min metall B Metall

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“…The first is work hardening when the particles are plastically deformed during the collisions with balls causing the increase of dislocation density [29]. The second mechanism is the grain refinement (Hall-Petch hardening) [28,30]. The next strengthening mechanism is dispersion hardening where the nanoparticles blocking the dislocation movement are homogenously distributed in the matrix.…”

Section: Discussionmentioning

confidence: 99%

Effect of Initial Powders on Properties of FeAlSi Intermetallics

et al. 2019

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FeAlSi intermetallics are materials with promising high-temperature mechanical properties and oxidation resistance. Nevertheless, their production by standard metallurgical processes is complicated. In this study, preparation of powders by mechanical alloying and properties of the samples compacted by spark plasma sintering was studied. Various initial feedstock materials were mixed to prepare the material with the same chemical composition. Time of mechanical alloying leading to complete homogenization of powders was estimated based on the microstructure observations, results of XRD and indentation tests. Microstructure, phase composition, hardness and fracture toughness of sintered samples was studied and compared with the properties of powders before the sintering process. It was found that independently of initial feedstock powder, the resulting phase composition was the same (Fe3Si + FeSi). The combination of hard initial powders required the longest milling time, but it led to the highest values of fracture toughness.

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“…Copper and its alloys are widely used in automobile, electronic, and electric power industries due to their high strength, high thermal and electrical conductivity, and good ductility, as well as because they can be easily shaped [1][2][3][4][5][6]. To satisfy applications in the frame materials in large-scale integrity circuits, besides the requirement of high strength and high electrical conductivity, excellent recrystallization resistance is also needed.…”

Section: Introductionmentioning

confidence: 99%

Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy

Chen

Jiang

et al. 2018

Metals

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In this paper, the precipitation, recrystallization, and evolution of twins in Cu-Cr-Zr alloy strips were investigated. Tensile specimens were aged at three different temperatures for various times so as to bring the strips into every possible aging condition. The results show that the appropriate aging parameter for the 70% reduced cold-rolled alloy strips is 723 K for 240 min, with a tensile strength of 536 MPa and an electrical conductivity of 85.3% International Annealed Copper Standards (IACS) at the peak aged condition. The formation of fcc (face-centered cubic) ordered Cr-rich precipitates (β) is an important factor influencing the significant improvement of properties near the peak aged condition. In terms of crystallographic orientation relationships, there are basically two types of β precipitates in the alloy. Beyond the Cr-rich precipitates (β (I)) formed during the early aging stages, which mimic a cube-on-cube orientation relationship (OR) with the matrix, another Cr-rich precipitate (β (II)) is observed in the peak aged condition. β (II) is coherent with the matrix, with the following ORs: [111] β (II) //[100] Cu , {02-2} β (II) //{02-2} Cu and [011] β (II) //[211] Cu , {200} β (II) //{-111} Cu. These precipitates have a strong dislocation and grain boundary pinning effect, which hinder the dislocation movement and crystal boundary migration, and eventually delay recrystallization and enhance the recrystallization resistance of the peak aged strips. During the subsequent annealing process, the transition phase β gradually loses the coherence mismatch and grows into a larger equilibrium phase of chromium with a bcc (body-centered cubic) structure (β), resulting in the reduction of the pinning effect to dislocations and sub-grains, so that recrystallization occurs. Annealing twins are formed during the recrystallization process to release the deformation energy and to reduce the drive force for interface migration, eventually hindering grain growth.

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Microstructure, Hardness Evolution, and Thermal Stability Mechanism of Mechanical Alloyed Cu-Nb Alloy during Heat Treatment

Cited by 8 publications

References 35 publications

Generalised stacking fault energies of copper alloys - density functional theory calculations

Generalised stacking fault energies of copper alloys - density functional theory calculations

Effect of Initial Powders on Properties of FeAlSi Intermetallics

Precipitation, Recrystallization, and Evolution of Annealing Twins in a Cu-Cr-Zr Alloy

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