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Effect of thermomechanical treatment on microstructure and hardness behavior of AZ63 mag.esium alloy

Acta Metallurg.ca Sinica(Eng.ish Letters) 2009年第6期22卷 401-407页

作者： H. Jafari M.H. Idris A. Ourdjini g. payganeh Department of Materials Eng.neering Faculty of Mechanical EngineeringUniversiti Teknologi Malaysia Department of Materials Eng.neering Faculty of Mechanical EngineeringShahid Rajaee Teacher Training University Department of Materials Eng.neering Faculty of Mechanical Engineering Shahid Rajaee Teacher Training University

Due to their hig. specific streng.h and low density, mag.esium alloys are widely used in many weig.t-saving.applications. This research is aimed at investig.ting.the microstructure and hardness of commercial AZ63 alloy specimens subjected to two different thermomechanical treatments （TMTs）. For the first TMT, after solution treated at the temperature of 380 ℃ for 20 h, AZ63 alloy specimens were 5% cold worked by rolling.process followed by ag.ing.at the temperatures of 150 ℃and 250 ℃ for 3, 9 and 25 h. In the second TMT, the specimens were solution treated at the temperature of 380 ℃ for 20 h, underwent 2% cold worked and quenched in water of 0 ℃. Half of the specimens were then 2% cold worked whilst the rest were rolled to 8% cold worked. All the specimens were then ag.d at the temperatures of 150 ℃ and 250 ℃ for 3, 9 and 25 h. Optical microscope was used to analyze the microstructures of the specimens. Hardness test was too conducted to measure the effect of the treatments on the specimens. Results show that two-step ag.ng.enhances the hardness of the specimens due to the distribution of fine β-phase （Mg.TA112） in the alloy matrix. The results also reveal that, the best hardness from the first TMT was produced by specimen that was pre-ag.d at 150 ℃ whereas, in the second TMT, ag.ng.at 250 ℃ exhibited the best hardness values.

关键词： Thermomechanical treatment Mag.esium alloys Cold work Ag.ng AZ63

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Influence of g.ting.System,Sand g.ain Size,and Mould Coating.on Microstructure and Mechanical Properties of Thin-Wall Ductile Iron

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Journal of Iron and Steel Research International 2010年第12期17卷 38-45页

作者： Hassan Jafari Mohd Hasbullah Idris Ali Ourdjini Majid Karimian g.olamhassan payganeh Department of Materials Eng.neering Universiti Teknologi Malaysia Department of Materials Eng.neering Shahid Rajaee Teacher Training University

Two g.ting.systems namely stepped and tapered runners were used to cast strip samples with different thicknesses by CO2/silicate process using.sand g.ain sizes of AFS 151 and 171. To assess the effect of mould coating.on the properties of thin wall ductile iron, half of the moulds were coated whilst the rest were not coated. Molten metal with the carbon equivalent of 4.29% was prepared and poured at 1 450 ℃. Microstructure of the specimens was analyzed by optical and scanning.electron microscopes. Count, area fraction, roundness and diameter of the g.aphite nodules of the samples were measured by imag. analyzer. Brinell hardness and tensile tests of all the samples were also conducted. The results show that by using.stepped runner g.ting.system with uncoated and coarse sand mould, roundness and count of the g.aphite nodules decrease whereas diameter and area fraction increase. Althoug. fine sand and coated mould cause long.r distance of molten metal travel, hardness and streng.h of the samples decrease.

关键词： thin-wail ductile iron g.ting.system sand g.ain size mould coating mechanical property mierostructure

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