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Acta Metallurgica Sinica(English Letters) 2022年第4期35卷 636-650页

作者： Zohreh Yazdani mohammad reza toroghinejad Hossein Edris Department of Materials Engineering Isfahan University of Technology84156-83111 IsfahanIran

The strengthening mechanisms of Al-TiAl_(3) nanocomposite, fabricated using cold roll bonding, annealing, and accumulative roll bonding(ARB) on Al sheets sandwiching with pure Ti powder were investigated in the present study. With annealing at 590 ℃ for 2 h, TiAl_(3) intermetallic compound was formed. After subsequent ARB process up to 5 cycles, final composite consists of ultrafine Al grains of less than 500 nm with TiAl_(3) particles larger than 200 nm. The strength and hardness of the final composite are 2.5 and 3.5 times the initial values, with an ultimate tensile strength of 400 MPa, which is dominated by grain-boundary strengthening due to the ultrafine Al grains, and Orowan strengthening due to the small TiAl_(3) particles. For comparison, an alternative fabrication route of cold roll bonding–ARB–annealing was also studied. This study showed that annealing before ARB is a critical factor in producing an ultrafine grain structure containing TiAl_(3) particles.

关键词： Composite Annealing Strength Microstructure Al

Corrosion and wear resistance of coatings produced on AZ31 Mg alloy by plasma electrolytic oxidation in silicate-based K2TiF6 containing solution:Effect of waveform

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Journal of Magnesium and Alloys 2022年第9期10卷 2574-2587页

作者： Maryam Rahmati Keyvan Raeissi mohammad reza toroghinejad Amin Hakimizad Monica Santamaria Department of Materials Engineering Isfahan University of TechnologyIsfahan 84156-83111Iran Yekta Mobaddel Pars Co. Science and Technology CampusYazd UniversityYazd 89158-18411Iran Dipartimento di Ingegneria Università di PalermoViale Delle ScienzeEd.690128PalermoItaly

In this research,plasma electrolytic oxidation coatings were prepared on AZ31 Mg alloy in a silicate-based solution containing K_(2)TiF_(6) using bipolar and soft sparking waveforms with 10,20,and 30%cathodic duty cycles.The coatings displayed a net-like surface morphology consisted of irregular micro-pores,micro-cracks,fused oxide particles,and a sintered structure.Due to the incorporation of TiO_(2) colloidal particles and the cathodic pulse repair effect,most of the micro-pores were sealed.Long-term corrosion performance of the coatings was investigated using electrochemical impedance spectroscopy during immersion in 3.5 wt.%NaCl solution up to 14 days.The coating grown by the soft sparking waveform with a 20%cathodic duty cycle having the lowest porosity(6.2%)and a sharp layer concentrated in F element at the substrate/coating interface shows the highest corrosion resistance.The friction coefficient of this coating has remained stable during the sliding even under 5 N normal load,showing relatively higher wear resistance than other coatings.The coating produced using the equivalent unipolar waveform,as the reference specimen,showed the highest friction coefficient and the lowest wear resistance despite its highest micro-hardness.

关键词： Plasma electrolytic oxidation Pulsed waveforms AZ31 Mg alloy Dipotassium titanium hexafluoride Corrosion resistance Wear resistance

Effects of intermediate Ni layer on mechanical properties of Al–Cu layered composites fabricated through cold roll bonding

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International Journal of Minerals,Metallurgy and Materials 2018年第5期25卷 573-583页

作者： Ali Shabani mohammad reza toroghinejad Alireza Bagheri Department of Materials Engineering Isfahan University of Technology

Layered composites have attracted considerable interest in the recent literature on metal composites. Their mechanical properties depend on the quality of the bonding provided by the intermediate layers. In this study, we analyzed the mechanical properties and bond strengths provided by the nickel layer with respect to its thickness and nature(either powder or coating). The results suggest that bond strength decreases with an increase in the content of nickel powder. At 0.3 vol% of nickel coating, we found the nature of nickel to be less efficient in terms of bond strength. A different picture arose when the content of nickel was increased and the bond strength increased in nickel coated samples. In addition, the results demonstrate that mechanical properties such as bend strength are strongly dependent on bond strength.

关键词： cold roll bonding Al/Ni/Cu composite mechanical testing metallography

冷轧FeCrCuMnNi多相高熵合金退火组织和织构形成的评价（英文）

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Transactions of Nonferrous Metals Society of China 2020年第2期30卷 449-462页

作者： Ali SHABANI mohammad reza toroghinejad Department of Materials Engineering Isfahan University of Technology

研究冷轧态FeCrCuMnNi多相高熵合金经不同退火处理后显微组织和织构的变化。样品经不同温度和不同时间热处理后进行不同的检测和表征,包括X射线衍射和扫描电镜-电子背散射衍射分析。结果显示,FCC1相具有较低的熔点,再结晶温度较低,时间... 详细信息

研究冷轧态FeCrCuMnNi多相高熵合金经不同退火处理后显微组织和织构的变化。样品经不同温度和不同时间热处理后进行不同的检测和表征,包括X射线衍射和扫描电镜-电子背散射衍射分析。结果显示,FCC1相具有较低的熔点,再结晶温度较低,时间较短,且应变较大。此外,与FCC2相比较,粒子激发形核对FCC1相的再结晶更有效。在BCC颗粒周围形成了大量FCC1晶核。FCC2的形核发生在800℃,大部分在晶界和不均匀处形核。此温度下,FCC1相已经完全再结晶。退火过程导致轧制组织的消除,而再结晶样品中的主要成分仍然是黄铜。提高退火温度和延长退火时间导致立方织构的形成,立方织构是低堆垛层错能材料再结晶的主要成分。此外,由于退火孪晶的形成,再结晶过程中形成了D和Rt-Co成分。

关键词：高熵合金 FeCrCuMnNi 再结晶显微组织织构

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镀层厚度对热浸镀锌低碳钢板可成行性的影响

现代冶金（内蒙古） 2009年第3期 56-64页

作者： mohammad reza toroghinejad[伊朗] 张怀军(译) 李德奎(校)

本文评价了热浸镀锌低碳钢板的可成行性，通过采用五种不同镀层重量的镀锌板，分析了镀层厚度对成行性的影响，并且与未采用镀层的镀锌板进行了比较。采用X-射线衍射和计算的织构参数确定镀层的定向结晶，通过采用成形极限图（FLD）对... 详细信息

本文评价了热浸镀锌低碳钢板的可成行性，通过采用五种不同镀层重量的镀锌板，分析了镀层厚度对成行性的影响，并且与未采用镀层的镀锌板进行了比较。采用X-射线衍射和计算的织构参数确定镀层的定向结晶，通过采用成形极限图（FLD）对试样进行单轴拉伸试验和对钢板成行性的评价，确定试样的机械性能。根据试验结果可以断定：通过提高镀层厚度，可以减少基面组元的织构参数，这种变化导致镀层薄板屈服强度的提高，但是降低了板材的延展性。对结果进行综合评价，涂层较厚的镀锌钢板成行性好于没有涂层镀锌钢板的成行性，同时也好于其它镀层较厚的钢板成行性。

关键词：热浸镀锌低碳钢结晶织构薄板成行性成形极限图