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Surface Modification of AZ31 Magnesium Alloy and Pure Titanium by High Current Pulsed Electron Beam

Author: KuangJun
Tutor: LiGang
School: Liaoning Technical University
Course: Materials Processing Engineering
Keywords: Intense pulsed electron beam AZ31 magnesium alloy Pure titanium Wear resistance Corrosion resistance
CLC: TG166.4
Type: Master's thesis
Year: 2009
Downloads: 73
Quote: 0
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Abstract


Intense pulsed electron beam processing means surface modification technology has been developed rapidly . Occur when the high energy electron beam in a very short pulse within the time when the energy injection to a very thin layer of the material surface , and instantly heated , melted, or even vaporized, and the subsequent curing process, and accompanied by a dynamic stress is produced , and these have may change the physical and chemical and mechanical properties of the surface layer . Nadezhda-2 type of intense pulsed electron beam device AZ31 magnesium alloy and pure titanium surface modification using optical microscopy, scanning electron microscopy , X - ray diffraction and microscopic morphology and structure analysis to deal with the surface of the sample , comparative studies, the results showed that : AZ31 Magnesium Alloy AZ31 magnesium alloy : intense pulsed electron beam treatment appeared typical crater morphology , while craters and the wear resistance and corrosion resistance of the sample before and after electron beam processing around have stress waves generated Zhehen . Wear scar width shorter by the original sample 922μm reduced to 658.67μm of . The resistance increased mainly due to the electron beam rapid solidification of the surface generated by the role of grain refinement and solid solution strengthening . The corrosion potential is elevated by the original sample -1540mV to -1231mV. Electron beam surface modification can lead to surface magnesium , aluminum and metals content and distribution in the form of changes ; rise of the sample surface aluminum elements to improve the main reason for its corrosion . AZ31 Magnesium Alloy intense pulsed electron beam aluminum processing , wear scar width is reduced from the original sample 922μm to 513.7μm. 5% NaCl sample anti- corrosion significantly improve the corrosion potential to improve by the original sample -1540mV to - 934.4mV . Due to the presence of a surface of aluminum to form a dense passivation film , isolation substrate, anodic dissolution process is affected, and the speed reduction of the dissolution of magnesium . The titanium : intense pulsed electron beam treatment of titanium surface crater morphology , surface microhardness value increases with the number of pulses , increased from the original sample 154HK 275HK . Compared with the original sample , the corrosion and wear resistance of the samples after treatment were clearly improved.

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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 magnesium and its alloys
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