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| 1 | 基于物理的2024和7075铝合金简化热变形本构方程(英文)显示文摘通过基于物理方法的本构方程研究2024和7075铝合金的热变形行为。研究温度对铝弹性模量和自扩散系数的影响。研究结果表明,为描述峰值流变应力,铝的晶格自扩散激活能(142 kJ/mol)可作为Zener-Hollomon参数方程的变形激活能,而改进双曲正弦函数中的理论指数可设为5。考虑基于物理的材料参数,可以对2024和7075铝合金的热流变应力进行对比研究。所采用的方法是一个通用工具,可用于热加工的对比研究和合金开发。 | Hamed MIRZADEH | 2015 | Transactions of Nonferrous Metals Society of China2015，25，5： | 17 |
| 2 | A comparative study on the hot flow stress of Mg-Al-Zn magnesium alloys using a simple physically-based approach显示文摘A comparative study was carried out on the hot flow stress of AZ31,AZ61,and AZ91 magnesium alloys.Their hot working behaviors were studied through constitutive analysis based on a simple physically-based approach which accounts for the dependence of the Young's modulus and the self-diffusion coefficient of magnesium on temperature.Since the main difference between these alloys is the difference in their amount of aluminum,the differences in constitutive behavior were quantitatively characterized by relating the hot flow stress to amount of Al,which was not possible without the consideration of physically-based parameters.It was concluded that the used approach in the current work can be considered as a versatile tool in future hot working and alloy development studies. | Hamed Mirzadeh | 2014 | Journal of Magnesium and Alloys2014，2，3： | 8 |
| 3 | Synergistic effect of Al and Gd on enhancement of mechanical properties of magnesium alloys显示文摘The effect of Gd/Al ratio on the properties of as-cast Mg-Gd-Al-Zn alloys was investigated by changing the chemical composition from that of AZ61 to GZ61. At the ratio of 1, the Al_2 Gd phase becomes predominant and Mg_(17)Al_(12) is hardly seen in the microstructure. As a potent inoculant, the Al_2Gd phase resulted in intense grain refinement and enhancement of strength, ductility and toughness. For instance, the tensile strength and elongation to failure of Mg-3Gd-3Al-1Zn alloy were enhanced by ~4% and 180% compared with those of AZ61 alloy, respectively. However, at high Gd/Al ratios, the Al_2Gd phase was replaced by(Mg,Al)_3Gd and Mg5 Gd phases and very large grain sizes were achieved, which led to poor tensile properties and the appearance of cleavage facets on the fracture surfaces. Therefore, it can be deduced that the presence of Gd and Al, in appropriate amounts to reach Gd/Al ratio of ~ 1, is required for the achievement of grain refinement, good ductility, high strength, and the appearance of ductile fracture surfaces in the Mg-Gd-Al-Zn system.Conclusively, the Mg-Gd-Al-Zn alloys can be considered as a new class of structural magnesium alloy and it is superior to both AZ(Mg-Al-Zn) and GZ(Mg-Gd-Zn) series of alloys. | Bita Pourbahari Masoud Emamy Hamed Mirzadeh | 2017 | Progress in Natural Science:Materials International2017，27，2： | 5 |
| 4 | Simple physically-based constitutive equations for hot deformation of 2024 and 7075 aluminum alloys显示文摘 | Hamed MIRZADEH | 2015 | Transactions of Nonferrous Metals Society of Chin2015，，： | 1 |
| 5 | Dependency of Deformation Behavior of Retained Austenite in TRIP Steels on Microstructural and Chemical Homogeneity显示文摘The room-temperature stability of the retained austenite against strain-induced martensitic transformation, its deformation behavior, the response to the bainitic isothermal treatment, the appearance of yield point elongation and other peculiarities of plastic flow, and the mechanical properties of transformation-induced plasticity(TRIP) steel were tailored based on the chemical homogeneity and the relative distribution of the retained austenite, bainite, and ferrite in the microstructure. The presence of ferritic-pearlitic banded structure in the initial microstructure resulted in an inhomogeneous TRIP microstructure, in which the retained austenite and bainite were confined to some bands and it was found to be responsible for the resultant inferior mechanical properties. The appearance of discontinuous yielding for the chemically inhomogeneous material was related to the martensitic transformation of unstable retained austenite at the initial stage of tensile deformation. These results are essential for better understanding of the behavior of advanced high-strength steels and their applications. | Ghavam Azizi Hamed Mirzadeh Mohammad Habibi Parsa | 2015 | Acta Metallurgica Sinica(English Letters)2015，28，10： | 1 |
| 6 | Constitutive relationships for hot deformation of austenite 显示文摘 | Hamed Mirzadeh Jose Maria Cabrera Abbas Najafizadeh | 2011 | Acta Materialia2011，59，16： | 1 |
| 7 | Constitutive Relationships for Hot Deformation of Austenite 显示文摘 | Hamed Mirzadeh Jose Maria Cabrera Hamed Mirzadeh | 2011 | ActaMaterialia2011，，64： | 1 |
| 8 | Surface metal-matrix composites based on AZ91 magnesium alloy via friction stir processing:A review显示文摘This monograph presents an overview of friction stir processing(FSP)of surface metal-matrix composites(MMCs)using the AZ91 magnesium alloy.The reported results in relation to various reinforcing particles,including silicon carbide(SiC),alumina(Al_(2)O_(3)),quartz(SiO_(2)),boron carbide(B_(4)C),titanium carbide(TiC),carbon fiber,hydroxyapatite(HA),in-situ formed phases,and hybrid reinforcements are summarized.AZ91 composite fabricating methods based on FSP are explained,including groove filling(grooving),drilled hole filling,sandwich method,stir casting followed by FSP,and formation of in-situ particles.The effects of introducing second-phase particles and FSP process parameters(e.g.,tool rotation rate,traverse speed,and the number of passes)on the microstructural modification,grain refinement,homogeneity in the distribution of particles,inhibition of grain growth,mechanical properties,strength–ductility trade-off,wear/tribological behavior,and corrosion resistance are discussed.Finally,useful suggestions for future work are proposed,including focusing on the superplasticity and superplastic forming,metal additive manufacturing processes based on friction stir engineering(such as additive friction stir deposition),direct FSP,stationary shoulder FSP,correlation of the dynamic recrystallization(DRX)grain size with the Zener–Hollomon parameter similar to hot deformation studies,process parameters(such as the particle volume fraction and external cooling),and common reinforcing phases such as zirconia(ZrO_(2))and carbon nanotubes(CNTs). | Hamed Mirzadeh | 2023 | International Journal of Minerals,Metallurgy and Materials2023，30，7： | 0 |
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