Nanoporous metal as a platform for electrochemical and optical sensing

Qiu, Hua‐Jun; Xiao, Li; Xu, Haitao; Zhang, Huijuan; Wang, Yu

doi:10.1039/c4tc01913j

Cited by 84 publications

(72 citation statements)

References 96 publications

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“…In previous reports, many attempts have been made to achieve stress relief and dislocation density reduction in superalloy single crystals to avoid RX. However, no completely successful example has been reported, because the recovery annealing temperature was either too low (below 1000 °C) [40] or too high (over the γ ′ solvus temperature). [26] Cyclic recovery annealing was also employed but proved to be inefficient to reduce the driving force for RX.…”

Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Rafting‐Enabled Recovery Avoids Recrystallization in 3D‐Printing‐Repaired Single‐Crystal Superalloys

Chen

Huang

et al. 2020

Advanced Materials

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The repair of damaged Ni‐based superalloy single‐crystal turbine blades has been a long‐standing challenge. Additive manufacturing by an electron beam is promising to this end, but there is a formidable obstacle: either the residual stress and γ/γ ′ microstructure in the single‐crystalline fusion zone after e‐beam melting are unacceptable (e.g., prone to cracking), or, after solutionizing heat treatment, recrystallization occurs, bringing forth new grains that degrade the high‐temperature creep properties. Here, a post‐3D printing recovery protocol is designed that eliminates the driving force for recrystallization, namely, the stored energy associated with the high retained dislocation density, prior to standard solution treatment and aging. The post‐electron‐beam‐melting, pre‐solutionizing recovery via sub‐solvus annealing is rendered possible by the rafting (i.e., directional coarsening) of γ ′ particles that facilitates dislocation rearrangement and annihilation. The rafted microstructure is removed in subsequent solution treatment, leaving behind a damage‐free and residual‐stress‐free single crystal with uniform γ ′ precipitates indistinguishable from the rest of the turbine blade. This discovery offers a practical means to keep 3D‐printed single crystals from cracking due to unrelieved residual stress, or stress‐relieved but recrystallizing into a polycrystalline microstructure, paving the way for additive manufacturing to repair, restore, and reshape any superalloy single‐crystal product.

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Section: Wwwadvmatde Wwwadvancedsciencenewscommentioning

confidence: 99%

Rafting‐Enabled Recovery Avoids Recrystallization in 3D‐Printing‐Repaired Single‐Crystal Superalloys

Chen

Huang

et al. 2020

Advanced Materials

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“…The catalytic and optical properties of np-Au have also been reviewed by Biener et al [6] and Wittstock et al [7,23] The actuation application of np-Au has been reviewed by Jin and Weissmuller [8]. Quite recently, we also reviewed the sensing application of dealloyed nanoporous metals [24]. As an active research field, to date, besides np-Au, many other nanoporous metals/alloys have also been successfully prepared by dealloying well-designed precursors.…”

Section: Introductionmentioning

confidence: 95%

Using corrosion to fabricate various nanoporous metal structures

Qiu

Liang

et al. 2015

Corrosion Science

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“…However, joining by welding of dissimilar materials is often not possible due to varying physical properties, namely melting temperature, heat conductivity and heat capacity. Moreover, the melting of dissimilar materials can lead to the creation of brittle intermetallic phases [2]. An approach to overcome these limitations is the use of auxiliary elements.…”

Section: Introductionmentioning

confidence: 99%

Fundamental mechanisms and their interactions in shear‐clinching technology and investigation of the process robustness

Wiesenmayer

Han

Mûller

et al. 2019

Materialwissenschaft Werkst

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was das Fügen artungleicher Werkstoffe mit stark unterschiedlichen mechanischen Eigenschaften ermöglicht. Aus der Kombination der Teilprozesse Schneiden und Fügen ergibt sich eine erhöhte Komplexität. Innerhalb der vorliegenden Arbeit werden daher grundlegende Mechanismen beim Schneidclinchen und deren Wechselwirkung sowie die Robustheit des Prozesses untersucht, um die Anwendbarkeit der Technologie zu verbessern. Schlüsselwörter: Fügen / Schneidclinchen / Multi-Material Design / Werkzeug / Prozessrobustheit 2 3 4 5 6 7 8

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Nanoporous metal as a platform for electrochemical and optical sensing

Cited by 84 publications

References 96 publications

Rafting‐Enabled Recovery Avoids Recrystallization in 3D‐Printing‐Repaired Single‐Crystal Superalloys

Rafting‐Enabled Recovery Avoids Recrystallization in 3D‐Printing‐Repaired Single‐Crystal Superalloys

Using corrosion to fabricate various nanoporous metal structures

Fundamental mechanisms and their interactions in shear‐clinching technology and investigation of the process robustness

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