Regulating precipitate orientation in Mg-Al alloys by coupling twinning, aging and detwinning processes

Liu, Feiya; Xin, Renlong; Wang, Chunpeng; Song, Bo; Liu, Qing

doi:10.1016/j.scriptamat.2018.08.049

Cited by 51 publications

(13 citation statements)

References 26 publications

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“…Thus, twinning-detwinning after aging can achieve a large re-orientation of precipitates. Recently, Liu and Xin et al [11] used coupling twinning, aging, and detwinning method to regulate the precipitates orientation of rolled AZ80 alloy from basal precipitates to prismatic precipitates, as shown in Figure 8. Clearly, the distribution of precipitates with different orientation can also be tailored by controlling twinning process.…”

Section: Deformation Induced Transition In Precipitate Orientationmentioning

confidence: 99%

“…The deformation that was induced by twinning-detwinning after aging can largely change the precipitate orientation in specific Mg alloys [4,11,81,82], as reviewed in Section 3. Liu and Xin et al [11] also confirmed that the change in precipitates orientation via detwinning (from basal-plate precipitates to prismatic-plate precipitates) can enhance the precipitation hardening effect on the yield strength dominated by slipping in rolled AZ80 alloy. Thus, it is expected that the transition of precipitate orientation induced by deformation can further tailor the mechanical properties and expand the application of existing Mg alloys.…”

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

“…It can be used to promote the uniform precipitation, as reported by Li et al [37]. Moreover, it can also be used to generate non-homogeneous distribution of precipitates, as reported by Song et al [27], Wang et al [29] and Liu et al [11]. For example, torsion deformation induces gradient strain in rods, resulting in macroscopic non-uniform distribution of precipitation behavior [27].…”

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

“…For example, torsion deformation induces gradient strain in rods, resulting in macroscopic non-uniform distribution of precipitation behavior [27]. Transition of precipitation behavior relating to deformation twins can induce microscopic non-uniform distribution of precipitates [11,29]. Recently, the heterogeneous structure (e.g.…”

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

“…In recent decades, the structure and strengthening mechanisms of these precipitates have been widely reported [6,7,8,9,10,11,12,13,14,15]. It is considered that it is very important for Mg alloys to enhance the precipitation hardening effect via promoting precipitation nucleation and regulating precipitation shape/orientation [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Regulating Precipitates by Simple Cold Deformations to Strengthen Mg Alloys: A Review

et al. 2019

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Regulating precipitates is still an important issue in the development of high-strength Mg alloys, due to it determining the precipitation hardening effect. Cold deformation, as a simple and low-cost method, can remarkably influence the precipitate features. It is found that pre-cold deformation before aging can be utilized to enhance the precipitation hardening effect of Mg alloys. Moreover, post-deformation after aging could be an effective method to regulate precipitation orientation. In this review, recent research on the regulation of precipitation behavior by cold deformation in Mg-Al, Mg-Zn, and Mg-RE (RE: rare-earth elements) alloy systems was critically reviewed. The changes in precipitate features and mechanical properties of peak-aged Mg alloys via cold deformation were summarized. The corresponding strengthening mechanisms were also discussed. Finally, further research directions in this field were proposed.

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Section: Deformation Induced Transition In Precipitate Orientationmentioning

confidence: 99%

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

Section: Strengthening Mechanism Via Combined Use Of Cold Deformatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regulating Precipitates by Simple Cold Deformations to Strengthen Mg Alloys: A Review

et al. 2019

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Influence of Aging Prior to Extrusion on the Microstructure and Mechanical Properties of an Extruded AZ91 Alloy

et al. 2020

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Herein, aging prior to extrusion is used to regulate the microstructure and mechanical properties of an extruded AZ91 alloys. The results show that pre‐aging can induce numerous precipitates in Mg matrix to refine the recrystallized microstructure during hot extrusion of AZ91 alloys. After extrusion, most precipitates distribute at grain boundaries, suppressing grain growth. Thus, coupling pre‐aging and hot extrusion can effectively enhance the yield strength of the AZ91 alloy and maintain considerable plasticity (>15%) simultaneously. In contrast, the improvement in mechanical properties is not so effective by direct extrusion and subsequent heat treatment. Although the subsequent aging (T6 treatment) can induce dense precipitates inside grains generating strong precipitation hardening, it badly reduce the tensile ductility (to 6.3%) as well. Moreover, the T6 treated sample also exhibits lower yield strength compared with the extruded sample via coupling pre‐aging and hot extrusion. Based on the experimental analyses, the underline mechanisms are discussed.

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Effect of Precipitates in Mg−Sm Alloys on Their Deformation Behavior and Yield Asymmetry

Liu

Tan

et al. 2022

Adv Eng Mater

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The strengthening effect of precipitates in a Mg−0.4Sm (wt%) alloy on dislocation slip and extension twinning (ET) is evaluated by experimental work and viscoplastic self‐consistent (VPSC) modeling. Experimental results reveal that the extruded Mg−Sm alloy consists of rare‐earth texture (<−12−11> // ED) and extrusion texture (<−12−10> // ED) components. After aging precipitation, tensile yield stress is more effectively enhanced than compressive yield stress. Transmission electron microscopy (TEM) analysis confirms that the precipitates in the aged Mg−Sm alloy are of β′ with an orthorhombic crystal structure. The introduction of β′ precipitates in the compression sample stimulates a higher fraction of extension twins. VPSC modeling indicates that the critical‐resolved shear stresses (CRSS) for prismatic slip, pyramidal slip, and basal slip are increased by 75, 30, and 6 MPa, respectively, by aging precipitation, while the precipitation strengthening on ET is negligible. By preferentially hardening against prismatic slip, the compressive and tensile yield asymmetry are increased for the aged Mg−Sm alloy.

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Regulating precipitate orientation in Mg-Al alloys by coupling twinning, aging and detwinning processes

Cited by 51 publications

References 26 publications

Regulating Precipitates by Simple Cold Deformations to Strengthen Mg Alloys: A Review

Regulating Precipitates by Simple Cold Deformations to Strengthen Mg Alloys: A Review

Influence of Aging Prior to Extrusion on the Microstructure and Mechanical Properties of an Extruded AZ91 Alloy

Effect of Precipitates in Mg−Sm Alloys on Their Deformation Behavior and Yield Asymmetry

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