Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

Król, M.; Snopiński, Przemysław; Pagáč, Marek; Hajnyš, Jiří; Petrů, Jana

doi:10.3390/ma13204557

Cited by 9 publications

(8 citation statements)

References 52 publications

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“…A promising and efficient way to achieve the greenhouse gas emission reduction is the application of lightweight materials [ 4 , 5 , 6 ]. Typical materials, such as carbon steel and cast iron, can be replaced by materials with a higher strength to density ratio.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

et al. 2021

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To date, numerous investigations have shown the beneficial effect of ultrasonic vibration-assisted forming technology due to its influence on the forming load, flow stress, friction condition reduction and the increase of the metal forming limit. Although the immediate occurring force and mean stress reduction are known phenomena, the underlying effects of ultrasonic-based material softening remain an object of current research. Therefore, in this article, we investigate the effect of upsetting with and without the ultrasonic vibrations (USV) on the evolution of the microstructure, stress relaxation and hardness of the AlMg3 aluminum alloy. To understand the process physics, after the UAC (ultrasonic assisted compression), the microstructures of the samples were analyzed by light and electron microscopy, including the orientation imaging via electron backscatter diffraction. According to the test result, it is found that ultrasonic vibration can reduce flow stress during the ultrasonic-assisted compression (UAC) process for the investigated aluminum–magnesium alloy due to the acoustic softening effect. By comparing the microstructures of samples compressed with and without simultaneous application of ultrasonic vibrations, the enhanced shear banding and grain rotation were found to be responsible for grain refinement enhancement. The coupled action of the ultrasonic vibrations and plastic deformation decreased the grains of AlMg3 alloy from ~270 μm to ~1.52 μm, which has resulted in a hardness enhancement of UAC processed sample to about 117 HV.

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Section: Introductionmentioning

confidence: 99%

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

et al. 2021

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“…where a, t 0 , and p are fitting parameters. The stress decrease with time during the SR test can be described by Equation (12) [1,2]:…”

Section: Methodsmentioning

confidence: 99%

“…Alloys containing between 5.6 and 10.8 wt% of Li are a compromise with good ductility and acceptable strength. The mechanical properties of Mg-Li alloys were studied in several papers [9][10][11][12]. Metal-matrix composites (MMC) based on Mg-Li alloys possess many advanced properties: increased strength and creep resistance, improved high temperature properties, increased wear resistance, and increased dimension stability because of decreased thermal expansion [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Trojanová

Drozd

Lukáč

et al. 2021

Metals

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Stress-relaxation tests were performed during plastic deformation at room temperature of three magnesium Mg–Li alloys reinforced with 10 vol% of short Saffil fibers. For comparison, the composite with the Mg matrix was studied. The time dependencies of the stress decrease were analyzed with the aim to determine the activation volume and the main types of thermally activated processes occurring during plastic flow. The Mg4Li matrix alloy exhibited the hcp structure, while the composite with the Mg12Li matrix alloy had the bcc structure. The third alloy, Mg8Li, combined both phases, hcp and bcc. The stress acting in the matrix was divided into two components: the internal stress and the effective stress. Activation volume and stress-sensitivity parameters were determined as a function of effective stress and strain. While the values of the activation volume depending on the effective stress lay on one “master” curve, the strain dependence was different for all materials. The main thermally activated process in the hcp structure was the dislocation motion in the noncompact planes, while in the bcc structure, massive recovery processes connected with an increase in dislocations were identified.

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“…The correlation coefficient R = 0.98563. The mean relative error AARE (Average Absolute Relative Error) is 4.002 %, which is less than 10 %, indicating that the error is small [27,28]. The correlation coefficient and the mean relative error are calculated as shown in Eqs.…”

Section: Establishment and Verification Of Constitutive Equationmentioning

confidence: 99%

Analysis of thermal deformation behavior and workability of 37CrS4 special steel

Yang¹,

Wang²,

Xue³

2023

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In order to optimize the thermal forging process of 37CrS4 special steel, single-pass thermal pressing tests are conducted, and a strain compensation Arrhenius constitutive equation is proposed based on the stress-strain curves of 37CrS4 at the temperature of 900-1100 • C and the strain rate of 0.1-10 s −1 . The stress values calculated from the equation are in good agreement with the counterparts in the thermal simulation compression test. The high correlation between the calculated and experimental data verifies the correctness of the strain compensation based on Arrhenius constitutive equation. According to the dynamic material model and instability criterion, the processing maps of 37CrS4 are established. It is concluded that 37CrS4 is more suitable for thermal working at a strain rate of 0.1-0.37 s −1 and temperature of 1000-1100 • C.

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Hot Deformation Treatment of Grain-Modified Mg–Li Alloy

Cited by 9 publications

References 52 publications

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

Ultrasound Effect on the Microstructure and Hardness of AlMg3 Alloy under Upsetting

Studying the Thermally Activated Processes Operating during Deformation of hcp and bcc Mg–Li Metal-Matrix Composites

Analysis of thermal deformation behavior and workability of 37CrS4 special steel

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