Improving mechanical properties of an AZ91 alloy by properly combining aging treatment and torsion deformation

Zhu, Yujuan; Liu, Feiya; Xin, Renlong; Song, Bo; Qing, Liu

doi:10.1016/j.msea.2020.139156

Cited by 16 publications

(7 citation statements)

References 48 publications

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“…Especially when deformed at low temperatures, there is a large stress concentration near the grain boundary due to the small slip system, which will promote the nucleation and growth of twins. Twin boundaries can act as a dislocation slip barrier, interacting with the W phase, dislocations, and twins, resulting in increased yield stress [30].…”

Section: Discussionmentioning

confidence: 99%

“…Secondly, the precipitates can hinder dislocation and grain boundary movement, facilitate dislocation accumulation, and increase the content of low-angle grain boundaries [29]. Thirdly, the precipitates introduced by the pre-aging treatment will strongly interact with the {10-12} extension twins during the subsequent plastic deformation, thereby improving the mechanical properties of Mg alloys [30]. Moreover, the precipitates were pre-introduced by pre-aging treatment to promote non-basal slip and texture weakening during plastic deformation [29].…”

Section: Introductionmentioning

confidence: 99%

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Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg–Zn–Gd–Er Alloys

Che

Lu²,

Liu³

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The mechanical behavior of solution heat-treated and pre-aged Mg-6Zn-1Gd-1Er alloys during hot compression (from 180 to 330 °C) has been investigated. The results showed that the flow stress curves of the pre-aged sample (PAS) intersected with that of the solution heat-treated sample (SHTS) during hot compression. At 180 °C, when the true strain is 0.27 and 0.47, the PAS showed larger and smaller stress (210.80 MPa vs. 207.58 MPa and 205.67 MPa vs. 207.93 MPa) than the SHTS, respectively. These phenomena were due to the stronger interaction of W phase and dislocations/twins under the strain of 0.27, while dynamic recrystallization softening occurred under the strain of 0.47. When the temperature increased to 330 °C, the flow stress of PAS and SHTS showed an opposite trend to that of 180 °C. Continuous dynamic recrystallization and particle stimulated nucleation based on slip operations are the main deformation mechanisms under 330 °C. At the true strain is 0.33 and 0.53, the PAS has smaller and larger stress (61.32 MPa vs. 63.69 MPa and 58.75 MPa vs. 57.09 MPa) than the SHTS, respectively. The increasing deformation resistance of dynamic precipitation improved the flow stress under smaller strain and dynamic recrystallization decreased the flow stress under high strain, which resulted the opposite phenomena of SHTS.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg–Zn–Gd–Er Alloys

Che

Lu²,

Liu³

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…[1][2][3][4][5] Among the commercially available magnesium alloys, the Mg-Al-Zn (AZ) series is widely used due to its relatively good mechanical properties and low costs. [6][7][8][9][10][11] For instance, the AZ31 alloy (Mg-3Al-1Zn wt%) has excellent plasticity and formability, making it widely used in aircraft and automobile manufacturing. [12][13][14][15][16] To further improve high-temperature strength and creep resistance, rare-earth (RE) magnesium alloys have been developed.…”

Section: Introductionmentioning

confidence: 99%

A Rolled Mg–8Al–1Sm–1Zn Alloy with High‐Strength Ductility via Single‐Pass Liner Rolling

Zhang,

Yu,

et al. 2024

Adv Eng Mater

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The microstructure and mechanical properties of Mg‐8Al‐1Sm‐1Zn alloy prepared by multi‐pass conventional rolling and single‐pass liner rolling were investigated in this paper. The alloy was subjected to multi‐pass conventional rolling with a cumulative deformation of 60% and single‐pass liner rolling with a deformation of 60% after solution‐treated (T4 temper) at 400 °C, respectively. The results showed that the best mechanical properties were obtained by single‐pass liner rolling at 400 °C with a deformation of 60% deformation under the combined effect of grain refinement and precipitation strengthening. The average grain size of the alloy is 7.2 μm, the microhardness is 80 HV, The tensile yield strength, ultimate tensile strength and elongation at room temperature are 255Mpa, 285MPa and 12.7%, which are 14.9%, 15.3%, and 10.4% higher than those of the conventional multi‐pass rolled alloy, respectively.This article is protected by copyright. All rights reserved.

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“…For example, the torsional deformation of AZ31 alloy can help strengthen the alloy by generating twin lamellae, profile dislocations, and weakened texture [ 14 ], while the pre-twinned AZ31 alloy shows higher strength [ 15 ]. It has also been observed that torsion can improve the tensile strength, compressive strength, and asymmetry of AZ91 alloy [ 16 ], and the strength of the alloy increases with the twisting angle.…”

Section: Introductionmentioning

confidence: 99%

Deformation Mechanism, Microstructure, and Mechanical Properties Evolution of Mg–Gd–Y–Zr Alloy during Cold Torsion

Xiao

Yang

et al. 2021

Materials

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Mg–Gd–Y–Zr alloy was subjected to torsion of various strain levels at room temperature. Obvious traces of basal slip were observed in the twisted alloy. Dislocations of <c+a> were also observed, but there were no signs of significant sliding. Even in the sample whose equivalent strain became 0.294, 101¯0 twinning and 101¯2 twinning were rarely seen. The deformation mode with predominant basal <a> dislocations and subordinate <c+a> dislocations resulted in a modified Y fiber texture with a basal pole slightly dispersed at about 70° from the twist axis. Mechanical tests revealed that the tensile strength and compressive strengths increased simultaneously after twisting.

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Improving mechanical properties of an AZ91 alloy by properly combining aging treatment and torsion deformation

Cited by 16 publications

References 48 publications

Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg–Zn–Gd–Er Alloys

Hot Compression Mechanical Behavior of Solution Heat-Treated and Pre-aged Mg–Zn–Gd–Er Alloys

A Rolled Mg–8Al–1Sm–1Zn Alloy with High‐Strength Ductility via Single‐Pass Liner Rolling

Deformation Mechanism, Microstructure, and Mechanical Properties Evolution of Mg–Gd–Y–Zr Alloy during Cold Torsion

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