Ductility Sensitivity to Stacking Fault Energy and Grain Size in Cu–Al Alloys

Tian, Yanzhong; Shibata, Akinobu; Zhang, Zhefeng; Tsuji, Nobuhiro

doi:10.1080/21663831.2015.1136969

Cited by 23 publications

(5 citation statements)

References 31 publications

(61 reference statements)

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“…Materials with higher stacking fault energy are more resistant to defect formation. An increased stacking fault energy indicates materials which are less ductile − (or more brittle) and thus are most susceptible to dissolution by particle fracture (i.e., rather than stacking fault initiation), which is facilitated by the rapid vibration of stimulation at the resonance frequency. This is further validated by the inverse linear correlation between the megasonic ratio and indentation modulus-to-hardness (M I /H) ratio in Figure c, the latter of which serves as a proxy for the ductility of a material (since the M I /H ratio corresponds to the inverse of a yield strain). − Note that here, the indentation modulus was calculated based on the simulated stiffness using data from the MD simulations, while hardness was obtained from microindentation tests in the literature .…”

Section: Resultsmentioning

confidence: 99%

Dissolution Amplification by Resonance and Cavitational Stimulation at Ultrasonic and Megasonic Frequencies

et al. 2022

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Acoustic stimulation offers a green pathway for the extraction of valuable elements such as Si, Ca, and Mg via solubilization of minerals and industrial waste materials. Prior studies have focused on the use of ultrasonic frequencies (20–40 kHz) to stimulate dissolution, but megasonic frequencies (≥1 MHz) offer benefits such as matching of the resonance frequencies of solute particles and an increased frequency of cavitation events. Here, based on dissolution tests of a series of minerals, it is found that dissolution under resonance conditions produced dissolution enhancements between 4×-to-6× in Si-rich materials (obsidian, albite, and quartz). Cavitational collapse induced by ultrasonic stimulation was more effective for Ca- and Mg-rich carbonate precursors (calcite and dolomite), exhibiting a significant increase in the dissolution rate as the particle size was reduced (i.e. available surface area was increased), resulting in up to a 70× increase in the dissolution rate of calcite when compared to unstimulated dissolution for particles with d 50 < 100 μm. Cavitational collapse induced by megasonic stimulation caused a greater dissolution enhancement than ultrasonic stimulation (1.5× vs 1.3×) for amorphous class F fly ash, despite its higher Si content because the hollow particle structure was susceptible to breakage by the rapid and high number of lower-energy megasonic cavitation events. These results are consistent with the cavitational collapse energy following a normal distribution of energy release, with more cavitation events possessing sufficient energy to break Ca–O and Mg–O bonds than Si–O bonds, the latter of which has a bond energy approximately double the others. The effectiveness of ultrasonic dissolution enhancement increased exponentially with decreasing stacking fault energy (i.e., resistance to the creation of surface faults such as pits and dislocations), while, in turn, the effectiveness of megasonic dissolution increased linearly with the stacking fault energy. These results give new insights into the use of acoustic frequency selections for accelerating elemental release from solutes by the use of acoustic perturbation.

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Section: Resultsmentioning

confidence: 99%

Dissolution Amplification by Resonance and Cavitational Stimulation at Ultrasonic and Megasonic Frequencies

et al. 2022

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“…For Cu–Al alloys, the previous investigations have revealed that the deformation mechanisms transfer from wavy slip to planar slip and twinning as SFE decreases via Al addition. Furthermore, superior balance of strength and ductility can be achieved by decreasing SFE . Apart from alloying effect, temperature is another important factor that impacts on SFE .…”

Section: Resultsmentioning

confidence: 99%

“…For metallic materials with face‐centered cubic (FCC) structure, the dislocation activity is sensitive to the stacking fault energy (SFE) and temperature . In this work, the mechanical behaviors of cold‐rolled (CR) and partially recrystallized (PRX) Cu–Al alloys were tested at 293 and 77 K, and mechanisms for mechanical property optimization were investigated.…”

Section: Introductionmentioning

confidence: 99%

Significant Enhancement in Cryogenic Mechanical Properties of Cu–Al Alloy via Minor Recrystallization

et al. 2018

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The mechanical properties of cold-rolled (CR) and partially recrystallized (PRX) Cu-Al alloy are investigated by tensile tests at 77 and 293 K. While the uniform elongation is limited for the CR specimens at both temperatures, uniform elongation is enhanced unprecedentedly from 2.4% at 293 K to 16.5% at 77 K for the PRX specimens. In contrast to the sole contribution of recrystallized grains via wavy slip at 293 K, the prominent uniform elongation at 77 K is attributed to the multiple deformation mechanisms within recrystallized grains and the harmonization of plastic deformation between recrystallized grains and matrix.

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“…For high-SFE metals with a FCC structure, the work hardening rate continuously decreases with the increase of strain, which is ascribed to the operation of cross-slip process as a dynamic recovery mechanism. [207][208][209] However, a typical work hardening rate recovery phenomenon can be found in low SFE metals, in which the work hardening rate keeps almost constant or increases with strain, [210][211][212] showing an improvement in the work hardening capacity. Consequently, a good strength-ductility match usually can be achieved in low SFE FCC metals rather than high SFE ones.…”

Section: Lowering the Stacking Fault Energymentioning

confidence: 99%

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

et al. 2023

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High‐ and medium‐entropy alloys (HEAs/MEAs), also called as multicomponent alloys, are a new class of materials that break through the traditional alloy design concept based on single principal element. However, they do not break away from the magic spell of strength–ductility trade‐off. Therefore, designing HEAs/MEAs with both high strength and high ductility still remains a great challenge nowadays. This article provides a review on the recent progress in mechanical properties of face‐centered cubic (FCC) HEAs/MEAs. First, several traditional strengthening strategies are briefly reviewed, focusing on the strengthening mechanisms and the optimized mechanical properties. Subsequently, various novel strategies for achieving strength–ductility synergy in HEAs/MEAs are summarized, which include lowering the stacking fault energy, regulating the short‐range order, promoting transformation‐induced plasticity, and constructing heterogeneous microstructures. The basic ideas and related underlying mechanisms from these strategies are discussed. Finally, the current challenges and the future outlooks are emphasized and addressed systematically. In brief, the present review is expected to provide a useful guide for the design of HEAs/MEAs with superior mechanical properties.

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Ductility Sensitivity to Stacking Fault Energy and Grain Size in Cu–Al Alloys

Cited by 23 publications

References 31 publications

Dissolution Amplification by Resonance and Cavitational Stimulation at Ultrasonic and Megasonic Frequencies

Dissolution Amplification by Resonance and Cavitational Stimulation at Ultrasonic and Megasonic Frequencies

Significant Enhancement in Cryogenic Mechanical Properties of Cu–Al Alloy via Minor Recrystallization

Strategies for Achieving Strength–Ductility Synergy in Face‐Centered Cubic High‐ and Medium‐Entropy Alloys

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