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Effect of Initial Grain Size on the Hot Deformation Behavior and Microstructural Evolution of Pure Copper

Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 662-678页

作者： H.R.Rezaei Ashtiani a.a.shayanpoor School of Mechanical Engineering Arak University of Technology38135-1177ArakIran

The influences of initial grain size(IGS)with 20μm and 50μm on the hot flow behavior and microstructural changes of pure copper were investigated using hot compression tests at a temperature range of 623–1073 K and strain rate range of 0.001–0.1 s^(-1).The effects of critical stress and corresponding critical strain were studied based on the internal and external processing *** critical stress and strain decreased with increasing temperature and decreasing strain *** investigation results of the microstructure and true strain–stress diagrams showed that dynamic recovery,dynamic recrystallization(DRX),and twinning mechanisms were caused during the hot deformation of pure *** evolution indicated some DRXed fine-grain took place around grain boundary of hot deformed samples with IGS of 20μm whereas DRXed fine-grain took place in interior grains for samples with larger *** results also showed that grain growth is also dependent on IGS as the grain growth rate for samples with the larger IGS is greater than the smaller *** critical strain rate and the temperature were obtained at 0.01 s^(-1) and 973 K,respectively,for the sudden change in the grain growth ***,twinning highly depended on IGS which almost did not happen in fine grain size while the volume fraction of twinning increased with increasing grain size.

关键词： Initial grain size Hot deformation Pure copper Microstructure Dynamic recrystallization(DRX) Twinning

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New constitutive equation utilizing grain size for modeling of hot deformation behavior of AA1070 aluminum

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Transactions of Nonferrous Metals Society of China 2021年第2期31卷 345-357页

作者： H.R.REZAEI ASHTIANI a.a.shayanpoor School of Mechanical Engineering Arak University of TechnologyArak38135-1177Iran

A new phenomenological and empirically-based constitutive model was proposed to modify the term in the original Johnson−Cook constitutive *** new model can be used to describe and predict the flow stress of AA1070 aluminum with different initial grain sizes in the hot working *** developed model considers thermal softening,strain-rate hardening,strain hardening,initial grain size,and interactions with each other and can correctly model the behavior of AA1070 at elevated temperature with different strains,strain rates,and initial grain *** hot flow behavior of AA1070 was investigated through compression tests over wide ranges of temperature from 623 to 773 K,strain rate from 0.005 to 0.5 s−1 and initial grain size from 50 to 450μ*** show that the initial grain size has a significant effect on the flow behavior of ***,correlation coefficient(R),average absolute relative error(AARE),and relative error were examined for comparative predictability of the *** show that flow stresses for different initial grain sizes calculated by the new proposed model perfectly correlate with experimental ones,with a mean relative error of 1.19%,which confirms that the new modified Johnson−Cook relation can give a precise estimation of the hot flow stress of AA1070 aluminum by considering the initial grain size.

关键词： constitutive equation modified Johnson−Cook model initial grain size flow stress hot deformation AA1070 aluminum

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Developing a new constitutive model for hot deformation behaviors of Al/Cu bimetal composites based on their components

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Transactions of Nonferrous Metals Society of China 2022年

作者： Amir Arsalan shayanpoor Hamid Reza REZAEI ASHTIANI School of Mechanical Engineering， Arak University of Technology

In this paper， the hot deformation behavior of Al/Cu bimetal composites was investigated using isothermal compression tests at temperatures of 400–500 ℃， strain rates of 0.001–0.1 s-1by considering the effects of volume fractions of composite components (30%-51% Al). In this regard， new proper constitutive equations were developed using Arrhenius-type and the rule of mixture (ROM) models. Experimental flow stress (FS) showed that processing parameters and volume fraction affect the flow behavior of composite as the volume fraction of copper has a more substantial impact on the flow behavior of the composite rods at elevated temperatures. The values of correlation coefficient (R) and average relative error percentage of the developed Arrhenius-type constitutive equation and ROM model were 0.9826， 0.9742， and 0.9718， and also 0.18%， 1.69%， and -0.84% for volume fractions of 51， 42， and 30% Al， respectively. The results indicate that the newly developed constitutive model can successfully predict the hot working behavior of the considered bimetal composite. Finally， the microstructure of composites was investigated under different processing conditions. The dominant mechanisms for three considered volume fractions were identified at different ranges of temperature， strain， and strain rate specified for the hot deformation of the Al/Cu composite.

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不同成分铝/铜双金属复合材料的热变形行为及其本构模型

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Transactions of Nonferrous Metals Society of China 2023年第12期33卷 3641-3660页

作者： Amir Arsalan shayanpoor Hamid Reza REZAEI ASHTIANI School of Mechanical Engineering Arak University of TechnologyArakIran

通过等温压缩实验,研究Al/Cu双金属复合材料在400~500℃、应变速率0.001~0.1 s^(-1)条件下的热变形行为,并考虑复合材料成分体积分数(Al含量为30%~51%)的影响。采用Arrhenius模型和混合定律(ROM)模型建立新的本构方程。流变应力(FS)实... 详细信息

通过等温压缩实验,研究Al/Cu双金属复合材料在400~500℃、应变速率0.001~0.1 s^(-1)条件下的热变形行为,并考虑复合材料成分体积分数(Al含量为30%~51%)的影响。采用Arrhenius模型和混合定律(ROM)模型建立新的本构方程。流变应力(FS)实验表明,工艺参数和体积分数对复合材料的流变行为有影响,而Cu的体积分数对复合材料的高温流变行为影响更大。对于体积分数为51%、42%和30%Al的复合材料,建立的Arrhenius型本构方程和ROM模型的相关系数(R)分别为0.9826、0.9742和0.9718,其平均相对误差分别为0.18%、1.69%和-0.84%。结果表明,新建立的本构模型能较好地预测双金属复合材料的热加工行为。最后,研究不同工艺条件下复合材料的显微组织,确定三种不同成分Al/Cu复合材料在不同温度、应变和应变速率范围内的主要热变形机制。

关键词：铝/铜双金属复合材料热变形混合定律(ROM) 本构方程力学行为显微组织

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