Microstructure evolution and deformation mechanisms of a banded-grained 2A97 Al–Cu–Li alloy during superplastic deformation

Zou, Guotong; Ye, Lingying; Li, Jun; Shen, Zhixin

doi:10.1016/j.msea.2023.145178

Cited by 10 publications

(3 citation statements)

References 56 publications

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“…The weighted Burger's vector length (WBVl) in this sample is unevenly distributed; some grains have uniformly low WBVl, whilst others have distinctly higher WBVl (Figures S1d and S5d in Supporting Information ). These microstructures contain all the features commonly observed in super‐plastically deformed alloys, namely: equitaxial grains; a low occurrence of low‐angle grain boundaries; evidence of grain‐boundary sliding (e.g., quadruple‐grain junctions) and large fraction of recrystallized grains (Liu et al., 2012; Myshlyaev et al., 2022; Nuttall & Nicholson, 1968; Zou et al., 2024).…”

Section: Resultsmentioning

confidence: 97%

“…It is generally assumed that for viscoelastic models (e.g., Burgers model) to be physically meaningful the microstructure must be constant. Instead, here the sinusoidal deformation completely reforms the microstructures (Figures 5 and 6, Figures S4 and S6 in Supporting Information ), which transform from initial diversity to a superplastic‐style microstructure (e.g., Liu et al., 2012; Myshlyaev et al., 2022; Nuttall & Nicholson, 1968; Zou et al., 2024). This is in contrast to the non‐sinusoidal samples and other studies (e.g., Bergman et al., 2018) in which the samples retain elements of their original microstructure.…”

Section: Discussionmentioning

confidence: 99%

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Experimental Observation of a New Attenuation Mechanism in hcp‐Metals That May Operate in the Earth's Inner Core

Hunt,

Walker,

Lord

et al. 2024

Geochem Geophys Geosyst

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Seismic observations show the Earth's inner core has significant and unexplained variation in seismic attenuation with position, depth and direction. Interpreting these observations is difficult without knowledge of the visco‐ or anelastic dissipation processes active in iron under inner core conditions. Here, a previously unconsidered attenuation mechanism is observed in zinc, a low pressure analog of hcp‐iron, during small strain sinusoidal deformation experiments. The experiments were performed in a deformation‐DIA combined with X‐radiography, at seismic frequencies (∼0.003–0.1 Hz), high pressure and temperatures up to ∼80% of melting temperature. Significant dissipation (0.077 ≤ Q−1(ω) ≤ 0.488) is observed along with frequency dependent softening of zinc's Young's modulus and an extremely small activation energy for creep (⩽7 kJ mol−1). In addition, during sinusoidal deformation the original microstructure is replaced by one with a reduced dislocation density and small, uniform, grain size. This combination of behavior collectively reflects a mode of deformation called “internal stress superplasticity”; this deformation mechanism is unique to anisotropic materials and activated by cyclic loading generating large internal stresses. Here we observe a new form of internal stress superplasticity, which we name as “elastic strain mismatch superplasticity.” In it the large stresses are caused by the compressional anisotropy. If this mechanism is also active in hcp‐iron and the Earth's inner‐core it will be a contributor to inner‐core observed seismic attenuation and constrain the maximum inner‐core grain‐size to ≲10 km.

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Section: Resultsmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Experimental Observation of a New Attenuation Mechanism in hcp‐Metals That May Operate in the Earth's Inner Core

Hunt,

Walker,

Lord

et al. 2024

Geochem Geophys Geosyst

View full text Add to dashboard Cite

show abstract

“…The content of these elements greatly influences the aging precipitation behavior of such alloys. [ 28 ] In Al–Cu–Li alloys, a higher Li content leads to the formation of a phase with a higher volume fraction, resulting in increased strength; [ 29–31 ] However, excessive Li content can negatively impact the plastic toughness of the alloy by producing a large number of phases. [ 32–34 ] Therefore, the Li content in the third generation of Al–Cu–Li alloys is usually kept below 1.8 wt%.…”

Section: Alloying Elements In Al–li Alloysmentioning

confidence: 99%

Research Progress of New Generation of Aluminum–Lithium Alloys Alloying

Xiao,

An,

Yang

et al. 2024

Adv Eng Mater

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Aluminum‐lithium alloy, being the lightest aluminum‐based alloy, holds significant potential for applications in the aerospace and military sectors. Currently, alloying treatment stands as a crucial method for enhancing the comprehensive performance of aluminum‐lithium alloy. This paper provides an overview of the production process of aluminum‐lithium alloys, encompassing smelting and deformation processing characteristics. Additionally, it outlines the developmental history of the chemical composition for the primary grades of aluminum‐lithium alloy, detailing the copper (Cu) and lithium (Li) content of the main alloying elements. And discusses the influence of various microalloying elements on the alloy’s properties.Additionally, it summarizes the structure, properties, and precipitation morphology of the three primary strengthening phases formed by the alloying of aluminum‐lithium alloys: T1 (Al2CuLi), θ′ (Al2Cu), and δ′ (Al3Li). The analysis also examines the impact of anisotropy on the mechanical properties of the primary dispersion. Finally, the paper addresses the challenges involved in alloying aluminum‐lithium alloys and proposes key research directions for element composition design.This article is protected by copyright. All rights reserved.

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The Influence of Y and Er on the Grain Structure and Superplasticity of Al-Cu-Mg-Based Alloys

Mikhaylovskaya,

Kotov,

Barkov

et al. 2023

JOM

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Microstructure evolution and deformation mechanisms of a banded-grained 2A97 Al–Cu–Li alloy during superplastic deformation

Cited by 10 publications

References 56 publications

Experimental Observation of a New Attenuation Mechanism in hcp‐Metals That May Operate in the Earth's Inner Core

Experimental Observation of a New Attenuation Mechanism in hcp‐Metals That May Operate in the Earth's Inner Core

Research Progress of New Generation of Aluminum–Lithium Alloys Alloying

The Influence of Y and Er on the Grain Structure and Superplasticity of Al-Cu-Mg-Based Alloys

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