The influence of precipitation transformation on Young's modulus and strengthening mechanism of a Cu–Be binary alloy

Huang, Xiaxu; Xie, Guoliang; Liu, Xinhua; Fu, Huadong; Shao, Lei; Hao, Zifan

doi:10.1016/j.msea.2019.138592

Cited by 30 publications

(12 citation statements)

References 35 publications

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“…Two factors could be considered: the ∑3 boundaries and the size and morphology of β phases. The vast majority of boundary friction [21,29]. Based on the TEM observations in Figure 12, given r = 20-100 nm for β particles, the calculation results of σ p is 165-43.65 MPa, which indicated that the strength contribution of secondary precipitations decreased with the increase of particle size.…”

Section: Resultsmentioning

confidence: 92%

“…The Orowan mechanism which is also called the by-passing mechanism is usually believed to be the main strengthening mechanism when particles are hard to be deformed with the matrix. For the by-passing mechanism [21,29]:…”

Section: Resultsmentioning

confidence: 99%

“…where σ p is the increase of yield strength caused by Orawan mechanism, M is proportional constant which is 3.06 for the fcc polycrystalline matrix, G is the shear modulus of Cu matrix, b is the Burgers vector, ν is the Poissons ratio, r is the mean radii of the particles and λ is the cutting distance of dislocations which can be determined by [29]:…”

Section: Resultsmentioning

confidence: 99%

“…Burgers vector, ν is the Poissons ratio, r is the mean radii of the particles and λ is the cutting distance of dislocations which can be determined by [29]:…”

Section: Resultsmentioning

confidence: 99%

“…Two factors could be considered: the ∑3 boundaries and the size and morphology of β phases. The vast majority of boundary friction Burgers vector, ν is the Poissons ratio, r is the mean radii of the particles and λ is the cutting distance of dislocations which can be determined by [29]:…”

Section: Resultsmentioning

confidence: 99%

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Microstructure and Mechanical Evolution of Cu-2.7Be Sheets via Annealing

Liu

Wang

Yao

et al. 2020

Metals

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The microstructure and mechanical properties of cold-rolled Cu-2.7Be sheets under various annealing processes and conditions were investigated in this research. The increased beryllium content in the Cu-2.7Be alloy facilitates the formation of brittle secondary phases. Consequently, the study highlights the functionality of annealed Cu-2.7Be alloys as more favorable dynodes than the traditionally used Cu-2.0Be alloys. The mechanism of recrystallization used for the transformation of Cu-2.7Be alloys was that of continuous static recrystallization (cSRX). Moreover, the relationship between the orientation of the β phases and that of the surrounding Cu-matrix was determined to be (111)α∥(110)β and (011)α∥(001)β. The β phase has a body-centered cubic (bcc) structure with a = b = c = 0.281 nm. The β phase undergoes a morphology transformation from primitive lath-shaped β particles to quadrangle-shaped β particles during the annealing process. Such transformations could potentially have an effect on the mechanical properties of Cu-2.7Be sheets. There was a noticeable decline in the yield strength of the Cu-2.7Be after annealing, and the samples annealed at 770 °C for 15 min achieved the elongation with deep and uniform dimples caused by suitable β particle sizes, appropriate grain sizes, and the maximum volume fraction of ∑3 boundaries.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Burgers vector, ν is the Poissons ratio, r is the mean radii of the particles and λ is the cutting distance of dislocations which can be determined by [29]:…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Microstructure and Mechanical Evolution of Cu-2.7Be Sheets via Annealing

Liu

Wang

Yao

et al. 2020

Metals

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Modular Combinatorial Development of Crystal‐Glass Nano‐Heterostructured Copper Alloys with Ultrahigh Strength and Large Deformability

Zhou,

Yuan,

Huang

et al. 2024

Adv Funct Materials

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Overcoming the strength‐ductility trade‐off in metals and alloys entails the optimization of the compositions and dedicated microstructural design, which remains experimentally laborious and challenging. Here, a combinatorial method is devised to construct a Cu‐Ti alloy library encompassing diverse compositions, microstructures, and mechanical properties, allowing to efficiently identify a copper alloy with an unprecedented yield strength of 3.8 GPa and high deformability. The exceptional properties are attributed to a crystal‐glass nano‐heterostructure (CGNH) consisting of nanograins, nano twins, and glassy phases. Ultrahigh strength stems from the extreme strengthening of structural‐unit refinement and the avoidance of softening caused by grain‐boundary sliding through the inclusion of glassy phases between nanograins. Remarkable deformability is associated with the activation of homogeneous flow in nanosized glassy phases, complemented by coordinated nanocrystal rotation. The CGNH architecture offers a potent route to overcome the trade‐off between alloy strength and deformability.

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