Optimization of Hot Deformation Parameters and Constitutive Analysis for As-Cast Mg-5Li-3Zn-0.3Y Alloy Using Processing Maps

Zhou, Yucheng; Chen, Zhaoyun; Ji, Jinqhan; Sun, Zhaohao

doi:10.1007/s11665-018-3565-6

Cited by 9 publications

(4 citation statements)

References 36 publications

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“…This indicates that the occurrence of DRX mechanism is earlier at higher temperature. the normal critical strain for DRX mechanism was 50% of the peak strain in this work, which was less than the 80% of the peak strain reported in previous works [27,28]. Additionally, it can be found that DRX mechanism occurred at a similar work hardening rate for different deformation temperatures.…”

Section: Resultscontrasting

confidence: 72%

“…Constitutive equation and hot processing map of the as-sintered Fe-2.1Cu-0.5C alloy Generally, the activation energy map is useful for evaluating the hot deformation behavior and determining the safe processing window of as-sintered Fe-2.1Cu-0.5C alloy. The activation energy for hot deformation is frequently derived from an Arrhenius-type constitutive equation, which could describe the correlations between the flow stress, temperature, and strain rate [27][28][29][30][31]. This constitutive equations were established based on the true stress-strain curves under different temperatures and strain rates.…”

Section: Resultsmentioning

confidence: 99%

“…Summarizing the above, the constitutive equation of the as-sintered Fe-2.1Cu-0.5C is given below: In order to optimize the processing parameters for hot deformation and control the microstructure of assintered Fe-2.1Cu-0.5C alloy, the hot processing map is constructed to determine the forging parameters by superimposition of the power dissipater map and the instability map based on the dynamic material model approach [27,32]. The industrial hot deformation processing is carried out within the temperature range the stability range to choose the desired forging parameters [27,28,33,34]. The instantaneous total power dissipation (P) could be separated into power content (G) and power co-content (J), which could be represented in relation to the flow stress, strain and strain rate.…”

Section: Resultsmentioning

confidence: 99%

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Hot deformation behavior and processing workability of a powder forged Fe-2.1Cu-0.5C alloy

Wang,

Chen,

Yang

et al. 2024

Mater. Res. Express

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Hot deformation behavior of as-sintered Fe-2.1Cu-0.5C alloy was evaluated through the construction of constitutive equations and a hot processing map. The hot deformation behavior was investigated at different temperatures and strain rates and microstructure observations were subsequently conducted. Flow stress for the initiation of dynamic recrystallization mechanism was determined. Tensile and fatigue strength tests were investigated at room temperature. It was observed that the microstructure of the alloy forged at lower temperature exhibited smaller grain size and its grain size increased with higher forging temperatures. Mechanical testing results revealed that an increase in the forging temperature led to a lower tensile strength and a higher fatigue strength. This change can be attributed to the larger grain sizes and the reduction of microcracks. A forging temperature at 1050 ℃ was recommended to achieve optimal mechanical properties for powder forged Fe-2.1Cu-0.5C products. These results might give some hints for optimizing process conditions and improving mechanical properties of powder metallurgy alloys by the use of constitutive equations and thermal processing maps.

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Section: Resultscontrasting

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Hot deformation behavior and processing workability of a powder forged Fe-2.1Cu-0.5C alloy

Wang,

Chen,

Yang

et al. 2024

Mater. Res. Express

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“…From the following trend of the curve, the trend of four figures' stress-strain curves is consistent, as illustrated in Figure 2b. In the study of Pan [26], Zhou [27], and Chen [28], the special peak of stress also appeared. Chen attributed the sudden change of stress to the change of slip mechanism through microstructure observation.…”

Section: Hot Compression Flow Behaviormentioning

confidence: 99%

Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy

Guo

Xuanyuan

Lia

et al. 2019

Metals

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The dynamic microstructure evolution of Mg-3Sn-2Al-1Zn-5Li magnesium alloy during hot deformation is studied by hot compression tests over the temperature range of 200–350 °C under the strain rate of 0.001–1 s−1, whereafter constitutive equations and processing maps are developed and constructed. In most of cases, the material shows typical dynamic recrystallization (DRX) features, with a signal peak value followed by a gradual decrease. The value of Q (deformation activation energy) is 138.89414 kJ/mol, and the instability domains occur at high strain rate but the stability domains are opposite, and the optimum hot working parameter for the studied alloy is determined to be 350 °C/0.001 s−1 according to the processing maps. Within 200–350 °C, the operating mechanism of dynamic recrystallization (DRX) of Mg-3Sn-2Al-1Zn-5Li alloy during hot deformation is mainly affected by strain rate. Dynamic recrystallization (DRX) structures are observed from the samples at 300 °C/0.001 s−1 and 350 °C/0.001 s−1, which consist of continuous DRX (CDRX) and discontinuous DRX (DDRX). However, dynamic recovery (DRV) still dominates the softening mechanism. At the grain boundaries, mass dislocation pile-ups and dislocation tangle provide sites for potential nucleation. Meanwhile, flow localization bands are observed from the samples at 200 °C/1 s−1 and 250 °C/0.1 s−1 as the main instability mechanism.

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Effects of Cold Rolling on Microstructural Evolution and Mechanical Properties of Mg–14Li–1Zn Alloy

Wang

Qiu

et al. 2019

Adv Eng Mater

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Cold rolling is employed to improve mechanical properties of Mg–14Li–1Zn alloy. Microstructural evolution and mechanical properties are investigated. Results show that, as‐cast and as‐homogenized Mg–14Li–1Zn alloy is mainly composed of β phase with trace amount of tiny α phase particles. During tensile test, the discontinuous α phase leads to intergranular fracture, which is a main reason for the low strength and low elongation. After cold rolling, the distribution of α phase becomes much more dispersive. The tensile fractural morphology changes from brittle intergranular fracture to dimple fracture. The sheet with 70% thickness reduction possesses the ultimate tensile strength of 212 MPa, elongation of 9.4%, and microhardness of 60.12 HV. When the total rolling reduction is 90%, the tensile strength decreases slowly to 210 MPa, but the elongation increases sharply to 19.8%. Strengthening mechanisms of the Mg–14Li–1Zn alloy are attributed to strain hardening and grain refinement. Strain hardening plays an important role in the enhancement of strength. Grain refinement and the appropriate distribution of the α(Mg) can obviously improve the plasticity.

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Optimization of Hot Deformation Parameters and Constitutive Analysis for As-Cast Mg-5Li-3Zn-0.3Y Alloy Using Processing Maps

Cited by 9 publications

References 36 publications

Hot deformation behavior and processing workability of a powder forged Fe-2.1Cu-0.5C alloy

Hot deformation behavior and processing workability of a powder forged Fe-2.1Cu-0.5C alloy

Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy

Effects of Cold Rolling on Microstructural Evolution and Mechanical Properties of Mg–14Li–1Zn Alloy

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