The interaction of deformation twins with long-period stacking ordered precipitates in a magnesium alloy subjected to shock loading

Zhang, Fan; Ren, Yu; Yang, Zhiqing; Su, Huhu; Zhou, Lu; Tan, Chengwen; Peng, Hailong; Watanabe, Kentaro; Li, Bin; Barnett, Matthew; Chen, Mingwei

doi:10.1016/j.actamat.2020.01.064

Cited by 34 publications

(6 citation statements)

References 62 publications

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“…The black area in the IPF maps is mainly the LPSO phase. The EBSD system cannot recognize the LPSO phase due to the lack of corresponding grain parameters [20,21] instead, was significantly larger than that of others. This suggests that the degree of grain refinement gradually increases with the increase of deformation temperature.…”

Section: Microstructure Evolutionmentioning

confidence: 79%

Effects of temperature-induced variation of the second phase on the microstructure, texture and properties of Mg-RE-Zn alloys

Lu,

Wu,

et al. 2024

Mater. Res. Express

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In this paper, the Mg-9.32Gd-3.72Y-1.68Zn-0.72Zr (wt%) alloy has undergone three times of repetitive upsetting extrusion deformation. Alloys with different morphologies and distribution patterns of the second phase have been prepared by varying the deformation temperature in each pass. The effects of the second phase on microstructure, texture and mechanical properties are investigated. The results show that (i) the second phase, including Mg5Gd and LPSO phase, has an important effect on the dynamic recrystallization (DRX) behavior of the alloy. (ii) Appropriate lamella distance and block phase size can promote the activation of the slip system and effectively weaken the texture strength. (iii) The DT sample has an effective combination of fine grain strengthening and second phase strengthening due to the reasonable second phase distribution and size, which greatly improves the UTS and YS of the alloy.

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Section: Microstructure Evolutionmentioning

confidence: 79%

Effects of temperature-induced variation of the second phase on the microstructure, texture and properties of Mg-RE-Zn alloys

Lu,

Wu,

et al. 2024

Mater. Res. Express

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“…In the dark field (DF) images, the laths attributed to the yellow circle are 80 nm, and both of them extend through the whole specimen, which further means the additional spots is not caused by the overlapping of α 2 and γ phase. Thus, the closely packed diffraction spots are considered to result from the LPSO phases [13][14][15][16][17]19,20]. In addition, the six equal divisions formed by the extra diffraction spots and the vertical relationship between (100) and ( 001) indicate that the LPSO phase corresponds to a 6H structure.…”

Section: Resultsmentioning

confidence: 99%

“…LPSO phases have been widely researched in Mg alloys, and they usually present various types of structures depending on the chemical compositions and processing craft [13][14][15]. These LPSO phases are demonstrated to not only heavily interact with the deformation twins [16,17], but also effectively increase the critical resolved shear stress of the basal plane [18]. Thus, the existence of LPSO phases would significantly improve comprehensive properties of Mg alloys, especially the strength and creep resistance at high temperatures [19,20].…”

Section: Introductionmentioning

confidence: 99%

Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy

Zhang

Wang

et al. 2020

Materials Research Letters

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In the present work, we have extensively examined the alternative-band microstructure of a Ti-47Al-2Cr-2Nb alloy fabricated via direct laser deposition by means of high resolution transmission electron microscopy and selected area electron diffraction. The studied samples exhibit two types of long-periodic stacking ordered phase with 6H and 18R structures, which were never reported for those obtained by traditional approaches. Moreover, the ordered phases possess stacking sequences of ABCBACA and ABCABCBCABCACABCABA, being analogous to the periodically arranged stacking faults in α 2 and γ phases, respectively. With the presence of these unusual structures, the as-deposited sample tends to have superior mechanical properties. IMPACT STATEMENTUnusual ordered phases with long periodic stacking structures, seldom reported in the TiAl alloys obtained by traditional approaches, were comprehensively characterized, and demonstrated to possess excellent mechanical properties.

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“…In this process, the twins engulf and rotate the precipitate. In other cases, precipitates can be sheared by twins (Clark, 1965;Zhang et al, 2020), although these cases are thought to be less common, and more study is needed. Some recent studies show interesting results that may lead to a better understanding of the precipitate-twin interaction, such as that written by Liu et al (2018b).…”

Section: Interaction With Precipitatesmentioning

confidence: 99%

Strengthening magnesium by design: integrating alloying and dynamic processing

Prameela¹,

Peng²,

Hollenweger³

et al. 2021

Preprint

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Magnesium (Mg) has the lowest density of all structural metals and has excellent potential for wide use in structural applications. While pure Mg has inferior mechanical properties; the addition of further elements at various concentrations has produced alloys with enhanced mechanical performance and corrosion resistance. An important consequence of adding such elements is that the saturated Mg matrix can locally decompose to form solute clusters and intermetallic particles, often referred to as precipitates. Controlling the shape, number density, volume fraction, and spatial distribution of solute clusters and precipitates significantly impacts the alloy's plastic response. Conversely, plastic deformation during thermomechanical processing can dramatically impact solute clustering and precipitation. In this paper, we first discuss how solute atoms, solute clusters, and precipitates can improve the mechanical properties of Mg alloys. We do so by primarily comparing three alloy systems: Mg-Al, Mg-Zn, and Mg-Y-based alloys. In the second part, we provide strategies for optimizing such microstructures by controlling nucleation and growth of solute clusters and precipitates during thermomechanical processing. In the third part, we briefly highlight how one can enable inverse design of Mg alloys by a more robust Integrated Computational Materials Design (ICMD) approach.

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The interaction of deformation twins with long-period stacking ordered precipitates in a magnesium alloy subjected to shock loading

Cited by 34 publications

References 62 publications

Effects of temperature-induced variation of the second phase on the microstructure, texture and properties of Mg-RE-Zn alloys

Effects of temperature-induced variation of the second phase on the microstructure, texture and properties of Mg-RE-Zn alloys

Unusual ordered phases with long periodic stacking structures in an additively manufactured TiAl alloy

Strengthening magnesium by design: integrating alloying and dynamic processing

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