Influence of lowering basal stacking fault energy on twinning behaviours

Wei, Bingqiang; Wu, Wenqian; Gong, Mingyu; Yu, Shuwei; Ni, Song; Song, Min; Wang, Jian

doi:10.1016/j.actamat.2022.118637

Cited by 20 publications

(1 citation statement)

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“…High-resolution transmission electron microscopy (HRTEM) observations can provide insights into the twinning structure at the atomic level. Compared to other types, a BCC {112}⟨111⟩-type twinning structure with an ideal twinned boundary (without artifacts) has not yet been reported for practical materials prepared under normal conditions; this phenomenon is simply due to the instability of this ideal twinning structure. , In BCC-type titanium alloys, the presence of hexagonal ω-phase particles at the twinning boundaries has been shown to significantly contribute to the stabilization of this twinning relationship. − …”

Section: Introductionmentioning

confidence: 99%

HRTEM Investigations on the Substructures of the Quenched Pearlite and Martensite

Zhu,

Yue,

Zhou

et al. 2024

Crystal Growth & Design

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The substructures of pearlite and martensite in a water-quenched Fe-1.4C (wt %) binary alloy were investigated via optical microscopy, scanning electron microscopy and high-resolution transmission electron microscopy. In the carbide layers of the quenched pearlite lamellae, θ-Fe3C-type cementite particles and several novel carbides were observed. According to electron diffraction patterns, the crystal structure of twinned martensite could not be characterized as a body-centered tetragonal crystal structure, which is commonly assumed. Instead, the patterns suggested that the twinned martensite could be considered to have a body-centered cubic α-Fe {112}⟨111⟩-type twinning structure accompanied by a metastable ω-Fe phase (ultrafine particles) at the twinning boundaries. Furthermore, high-resolution lattice observations of twinned martensite substructures demonstrated that ω-Fe phase particles could exist independently in regions without twinning structures, indicating that they were not solely caused by overlap at twinning boundaries; thus, this prior assumption was challenged. The mechanism of the formation of new carbides in quenched pearlite and the presence of the ω-Fe phase in the regions without twinning could be reasonably explained by the autotempering or detwinning of the twinned martensite.

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