Enhancing the age-hardening response of rolled AZ80 alloy by pre-twinning deformation

Wang, Chunpeng; Xin, Renlong; Li, Dongrong; Song, Bo; Wu, Mingyu; Liu, Qing

doi:10.1016/j.msea.2016.10.094

Cited by 53 publications

(31 citation statements)

References 38 publications

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“…Nevertheless, the mechanical properties especially the elongations for TD5RD4‐A36 sample at every individual test are much better than that of the directly aged sample. The yield strength in certain direction is slightly smaller than that of a previous work, in which the grains were completely twinned with almost no twin boundaries left . However, the peak strength is much larger especially in tension thanks to the largely improved elongation for the present sample.…”

Section: Resultscontrasting

confidence: 77%

“…Recently, we confirmed that pre‐twinning deformation in wrought AZ80 alloy sheets could promote continuous precipitation and inhibit discontinuous precipitation during the subsequent aging treatment, which is of great benefit to the improvement of ductility and yield asymmetry . In the previous work, grains were completely twinned by single path compression with almost no twin boundaries left in the microstructure .…”

Section: Introductionsupporting

confidence: 55%

“…Instead, continuous precipitates with finer size, more uniform distribution and higher density formed in the twins. According to the previous literature, the number density of continuous precipitates in twins is larger by one order than that in SS‐A sample . This greatly enhances the effect of precipitation hardening.…”

Section: Resultsmentioning

confidence: 81%

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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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Section: Resultscontrasting

confidence: 77%

Section: Introductionsupporting

confidence: 55%

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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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“…The tensile properties obtained in this work were also compared with those of other high strength Mg–Al–Zn alloys from reported literatures, as shown in Table . It indicates that both TYS and UTS of RS/PM alloy extruded at 170 °C are superior to those of all reported Mg–Al–Zn alloys.…”

Section: Resultsmentioning

confidence: 53%

Super‐High Strength Mg–7.5Al–0.8Zn Alloy Prepared by Rapidly Solidified Powder Metallurgy and Low Temperature Extrusion

et al. 2017

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In this work, Mg-7.5Al-0.8Zn alloy with super-high tensile strength are fabricated by rapidly solidified powder metallurgy (RS/PM) and low temperature extrusion technology. By reducing extrusion temperature from 340 to 170 C, the α-Mg grains are significantly refined and numerous nanoscale β-Mg 17 Al 12 particles are obtained. The RS/PM alloy extruded at 170 C possesses the lowest grain size of %550 nm. The nanoscale β-phase particles stimulate the nucleation of dynamically recrystallized (DRXed) grains and restrain the growth of DRXed grains. The RS/PM alloy extruded at 170 C exhibits mechanical properties with a tensile yield strength of 448 MPa, an ultimate tensile strength of 480 Mpa, and a microhardness of 137 HV. These excellent mechanical properties result from low temperature extrusion are mainly attributed to the ultra-fine DRXed grains and the high-density dislocations and subgrains.

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“…They have higher Al content which helps harden the alloys via solution or precipitation strengthening. Continuous precipitates and discontinuous precipitates, which have the same chemical composition but distinguished morphology and precipitation behavior, are the two major strengthening phases in Mg-Al series alloys [17][18][19][20][21]. It has been reported that discontinuous precipitates could take effect in enhancing strength, while continuous precipitates, which would be coarsened faster at higher ageing temperature, could not in effect strengthen alloys [20,22].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Aged and Hot Rolled AZ80 Magnesium Alloy Sheets

Zhao

et al. 2019

Crystals

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This study focused on the effects of ageing for various time at 175 °C before hot rolling on microstructure and mechanical properties of AZ80 magnesium alloys. The amount of γ-Mg17Al12 increased in line with ageing time and during the rolling process could facilitate the fine grains and sub-grains, which resulted in an inhomogeneous or bimodal microstructure, and weakening basal-type texture intensity or occurrence of double-peak texture. However, a larger quantity of γ-Mg17Al12 distributed on the matrix in the alloy aged for 240 min, or the precipitates decorating the grain boundaries in the alloy aged for 75 min, were detrimental to the mechanical properties, and lower ultimate tensile strength with elongation were obtained in the two alloys as a result. When the alloy was aged for 200 min, it showed an optimum mechanical property with its yield strength of 281 MPa, ultimate tensile strength of 363 MPa and a medium elongation of 13.3%, which was mainly attributed to the interaction of the hard second phase particles with dislocation movement and the lowest basal-type texture intensity that favored the basal slip.

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Enhancing the age-hardening response of rolled AZ80 alloy by pre-twinning deformation

Cited by 53 publications

References 38 publications

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

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

Super‐High Strength Mg–7.5Al–0.8Zn Alloy Prepared by Rapidly Solidified Powder Metallurgy and Low Temperature Extrusion

Microstructure and Mechanical Properties of Aged and Hot Rolled AZ80 Magnesium Alloy Sheets

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