Impact of anisotropic growth on kinetics of solid-state phase transformation

Song, Shaojie; Liu, Feng; Jiang, Yihui

doi:10.1016/s1003-6326(11)61262-4

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…This could result in a decrease in the Avrami exponent, which falls between 1 and 2. [ 46–48 ] To summarize, it can be deduced from the structural characterization and the Avrami exponent that the shear‐induced ordering transformation of the DLC film should proceed via anisotropic growth along the sliding direction with heterogeneous nucleation of a 2D graphitic layered structure. We note that a recent paper reports consistent results for a similar material (a silicon oxide‐doped DLC film), whereby a structural transformation of the near‐surface region due to repeated sliding in air leads to reduced friction.…”

Section: Resultsmentioning

confidence: 99%

Unraveling the Friction Evolution Mechanism of Diamond‐Like Carbon Film during Nanoscale Running‐In Process toward Superlubricity

Wang

Zhang

et al. 2020

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Diamond‐like carbon (DLC) films are capable of achieving superlubricity at sliding interfaces by a rapid running‐in process. However, fundamental mechanisms governing the friction evolution during this running‐in processes remain elusive especially at the nanoscale, which hinders strategic tailoring of tribosystems for minimizing friction and wear. Here, it is revealed that the running‐in governing superlubricity of DLC demonstrates two sub‐stages in single‐asperity nanocontacts. The first stage, mechanical removal of a thin oxide layer, is described quantitatively by a stress‐activated Arrhenius model. In the second stage, a large friction decrease occurs due to a structural ordering transformation, with the kinetics well described by the Johnson–Mehl–Avrami–Kolmogorov model with a modified load dependence of the activation energy. The direct observation of a graphitic‐layered transfer film formation together with the measured Avrami exponent reveal the primary mechanism of the ordering transformation. The findings provide fundamental insights into friction evolution mechanisms, and design criteria for superlubricity.

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Section: Resultsmentioning

confidence: 99%

Unraveling the Friction Evolution Mechanism of Diamond‐Like Carbon Film during Nanoscale Running‐In Process toward Superlubricity

Wang

Zhang

et al. 2020

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Structural evolution in 0.67(Sm Bi1−)FeO3-0.33BaTiO3 solid solution and its effect on multiferroic properties at room temperature

Wang

Zhu

et al. 2019

Materials Chemistry and Physics

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Effect of Austenite Grain Size on the Bainitic Transformation in a 690 MPa Grade High-Strength Multi-Functional Construction Steel

Chen

Zhao²,

et al. 2022

Metals

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A high-strength low-carbon construction structural steel was investigated in the laboratory. The various austenite grain sizes were obtained by austenitizing the steel at different temperatures. The effect of austenite grain size on bainite transformation was studied by the dilatometer. The results show that the microstructure of high-strength low-carbon structural steels mainly includes granular bainite, lath-like bainite and martensite-austenite (M-A). The microstructure changes from granular bainite to lath-like bainite with the increase in austenitizing temperature or austenite grain size. When the samples were heated at the lower temperature of 860 °C, the bainite starting temperature was relatively high, which was mainly attributed to the promotion of the granular bainitic nucleation and the formation of the solute-depleted regions in the austenite. Compared to 860 and 1260 °C, the bainite transformation rate in the specimen austenitized at 1000 °C is the highest because of the small prior austenite grain size and larger transformation driving force.

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Impact of anisotropic growth on kinetics of solid-state phase transformation

Cited by 3 publications

References 15 publications

Unraveling the Friction Evolution Mechanism of Diamond‐Like Carbon Film during Nanoscale Running‐In Process toward Superlubricity

Unraveling the Friction Evolution Mechanism of Diamond‐Like Carbon Film during Nanoscale Running‐In Process toward Superlubricity

Structural evolution in 0.67(Sm Bi1−)FeO3-0.33BaTiO3 solid solution and its effect on multiferroic properties at room temperature

Effect of Austenite Grain Size on the Bainitic Transformation in a 690 MPa Grade High-Strength Multi-Functional Construction Steel

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