The precipitation behavior of a pretwinned Mg–6Al–1Zn alloy and the effect on subsequent deformation

Zhang, Yin; Liu, Tianmo; Ding, Xuezheng; Xu, Shun; He, Jiejun; Chen, Hongbing; Pan, Fusheng; Lu, Liwei

doi:10.1557/jmr.2014.248

Cited by 23 publications

(13 citation statements)

References 23 publications

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“…When compared to as-cast alloys, wrought Mg alloys can generate profuse {10–12} twins by deformation along special directions [42]. Zhang et al [43] have fabricated an extruded AZ61 rod containing profuse {10–12} twin lamellae by compression along extrusion direction (to a plastic strain of ~3%). The preferential nucleation of precipitates in the twin boundaries and within twins has also been observed in pre-twinned AZ61 alloy during aging at 180 °C.…”

Section: Influences Of Pre-cold Deformation On Aging Precipitationmentioning

confidence: 99%

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: Influences Of Pre-cold Deformation On Aging Precipitationmentioning

confidence: 99%

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

et al. 2019

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“…On the other hand, coarse lath or plate‐like precipitate lamellae that generally nucleate from grain boundaries (i.e., the discontinuous precipitation) can be retarded . Moreover, it was found that precipitate preferred to nucleate from twin boundaries . However, the effects of pre‐generated twins and twin boundaries on the features of precipitates and the mechanical properties have not been systematically investigated.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the Microstructure and Mechanical Property of AZ80 Alloys by Multiple Twinning and Aging Precipitation

Wang

Xin

et al. 2017

Adv Eng Mater

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AZ80 alloy is a relatively inexpensive age-hardenable Mg alloy. To improve its precipitation strengthening effect, the discontinuous precipitates generally nucleating from grain boundaries should be reduced. In this study, the authors applied strain-path change compression on a wrought AZ80 alloy to generate multiple {10-12} twins and then the pre-deformed alloy is subjected to aging at 180 C for different period. The effects of the pre-generated twins on precipitation behavior and hence the mechanical properties are investigated. It is found that multiple {10-12} twins are formed in the AZ80 alloy after two paths of compressions along the transverse and rolling directions. Consequently, continuous precipitation is largely promoted during the subsequent aging process. Moreover, the continuous precipitates preferred to form inside the {10-12} twin lamellae. Discontinuous precipitation is almost inhibited during aging at 180 C for 4-96 h in the sample containing many multiple twins. Compare to the directly peak-aged sample, the pre-twinned and subsequently peak-aged alloys generally exhibit greatly superior mechanical properties. The yield strength, ultimate strength, and elongation for tension along RD are 242 MPa, 476 MPa, and 19.4%, respectively. These excellent properties are attributed to the combined effects of grain refinement, texture weakening, and enhanced precipitate strengthening.

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“…In addition to the effects of twinning on the resulting texture and workability of the alloy [12,13], twinning influence also the precipitation behavior. Numerous studies have been reported on the interactions between twins and pre-existing precipitates within the matrix, and phenomena such as impingement, bypassing or engulfment of precipitates have been observed [14][15][16]. However, few studies have examined the effect of twinning on precipitate formation during deformation [14,17,18].…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have been reported on the interactions between twins and pre-existing precipitates within the matrix, and phenomena such as impingement, bypassing or engulfment of precipitates have been observed [14][15][16]. However, few studies have examined the effect of twinning on precipitate formation during deformation [14,17,18]. Precipitation has been observed on twin boundaries as well as in the interior of twins [4,14].…”

Section: Introductionmentioning

confidence: 99%

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Twin-assisted precipitation during hot compression of an Mg-Gd-Zn-Zr magnesium alloy

Saadati

Khosroshahi

Ebrahimi

et al. 2017

Materials Science and Engineering: A

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Dynamic precipitation in an Mg-Gd-Zn-Zr alloy during hot compression at 350℃ and 450℃ and at strain rates of 0.001-0.1s-1 is investigated. The deformation conditions were designed such as to promote twinning or slip of dislocations. The results indicated that both twinned and non-twinned grains were present at 350℃, with the extent being a function of the applied strain rate. The formation and propagation of {101 ̅ 2}〈1 ̅ 011〉 primary tensile twins within the twinned grains was identified as being at root of the twin-assisted precipitation phenomenon. The precipitates had spherical-morphology in the twinned grains whereas parallel arrays of rod-shaped precipitates formed in the non-twinned grains due to dynamic precipitation on the slip bands and the stacking faults. Twin-assisted precipitates were suppressed by increases in the strain rate at 350℃ because of the shorter time required for solute element diffusion towards the nucleated precipitates at that temperature. Increasing the deformation temperature to 450℃ changed the dominant deformation

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The precipitation behavior of a pretwinned Mg–6Al–1Zn alloy and the effect on subsequent deformation

Cited by 23 publications

References 23 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

Tailoring the Microstructure and Mechanical Property of AZ80 Alloys by Multiple Twinning and Aging Precipitation

Twin-assisted precipitation during hot compression of an Mg-Gd-Zn-Zr magnesium alloy

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