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Electrolytic titanium ZL108 alloy heat treatment process optimization and rapid solidification

Author: ZhangJianBo
Tutor: WangJieFang
School: Zhengzhou University
Course: Condensed Matter Physics
Keywords: ZL108D alloy orthogonal test heat treantment ripid solidification morphology mechanical property
CLC: TG166.5
Type: Master's thesis
Year: 2007
Downloads: 42
Quote: 1
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Abstract


In this paper, the effect of the key heat-treatment factors on the mechanical property of the eutectic Al-Si alloy of ZL108 adding titanium by electrolysis (the alloy of ZL108D) is investigated. And the optimization heat treatment is achieved through a further test. At the same time, the ribbons of ZL108D are made by the single roller method, and the morphology of the rapidly solidified alloys is investigated.The range analysis of the orthogonal test shows that, to tensile strength and yield strength, the significance consequence of the heat treatment factors is: solution temperature>aging temperature>solution time>aging time and that of the hardness is: aging temperature>solution temperature>solution time>aging time, and the temperature is far more important than the time. With the increasing of solution temperature and the decreasing of aging temperature, the mechanical property increase.The variance analysis shows that, to the tensile strength, the yield strength and the hardness, the significance consequence of the factors is: solution temperature>aging temperature>solution time>aging time. The temperature is more important than the time. That is consistent with the results of the range analysis.The further test verifies the experimental law gotten from the orthogonal test, and the more optimizational heat treatment has been obtained which is solution temperature: 545°C, solution time: 7h, aging temperature: 175°C, and aging time: 10h, and the tensile strength, the yiled strength and the Vicker-hardness can reach 385MPa, 344MPa and 154.Through the single test, the Vicker-hardness doesn’t chang obviously with the variation of the solution time and can reach its maximum when the solution time is about 6h. With the increasing of the aging time, the vicker-hardness varies obviously, and reaches its maximum when aging time is 12h. At the same time, the area, the diameter and the roundness of the Si phase become big with the increasing of the solution time, as a result, its morphology and distribution has been changed. And when the solution time reach 7h, the roundness, the distribution and the size of the Si fit well and that have good effect on the mechanical property of this alloy.The results of the test of the same alloys made by the single roller method shows that, through the test of DSC, there are obvious differences between the endothermal curve of the ribbons made by the single roller method and that of the alloys produced by the metallic gravity casting method, and that can be due to the cooling rate differences which causes the diffeneces of solid solubility, which accelerate the formation and the variation of the precipitiated phase of the former. Through the test of XRD, it can be gotten that the robbions’ lattice constants are much smaller than that of the ideal substitution solid solution and the alloys produced by the metallic gravity casting method, which due to the increasing of the lattice deformation caused by the increasing of the solid solubility. And there are sharp diffraction peaks belonging to Al, and no other obvious peaks are discovered. These prove that the alloy agents have dissolved in the basal body entirely.Through the test of SEM and the metallographic microscrope, the morphology of the alloys which rapidly solidifies is much refiner than that of the alloys produced by the metallic gravity casting method. Through the test of TEM, it can be gotten that the morphology of the ribbons is made up ofα-Al and Al-Si eutectic area, and the grain size ofα-Al reach the magnitude of um, and the size of Si existing in the eutectic area reach the magnitude of nm.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Heat treatment > The heat treatment of non-ferrous metals and their alloys > The heat treatment of titanium and its alloys
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