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Study on Modification of 2024 Al Alloy Surface Doped with Titanium and Nitrogen

Author: ZhangFanYong
Tutor: ZuoMuFu
School: Harbin Institute of Technology
Course: Materials Science
Keywords: 2024 aluminum alloy Composite modified Ti-Al diffusion Hardness Friction and wear
CLC: TG174.4
Type: Master's thesis
Year: 2010
Downloads: 70
Quote: 0
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Abstract


2024 aluminum alloy surface hardness , abrasion resistance and ion nitriding difficult problem, using closed field unbalanced magnetron sputtering prepared in the aluminum alloy surface layer of Ti film in advance , and then pulsed plasma nitriding treatment , to explore the aluminum alloy plated diffusion with the modified process . The surface Ti film of 2024 aluminum alloy and composite modified layer of tissue morphology, phase structure and the distribution of elements were OM , SEM observation and XRD, EDS analysis , and thin-film composite modified layer microhardness , wear-resistant sexual characterized . SEM, EDS and XRD results showed that the surface of the Ti film prepared in this experiment is smooth, and the hexagonal structure corresponding to the ( 002 ) planes at 2θ = 38.3 ° preferential growth ; plated infiltration composite modified layer on the surface appears crease was wormlike surface high N content . The composite modified layer mainly composed of TiN, Al18Ti2Mg3 and Al3Ti phase composition , and the higher the nitriding temperature , the longer the holding time , the modified layer Al18Ti2Mg3 Al3Ti phase the higher the content . The Ti film and the aluminum alloy matrix occurred obvious interdiffusion tissue was layered structure , wherein the outer surface of the Ti-rich area , the N content is high , close to the side of the base body Mg element enrichment zone ; , and the higher the nitriding temperature proliferation of the more obvious , the thicker composite modified layer . Test results show that the mechanical properties of 2024 aluminum alloy plated seepage composite modified sectional hardness and modulus of elasticity than that of the matrix substantial increase in the nitrogen- hydrogen ratio 0.1:0.3 after 460? C nitriding 4h after composite change 5μm at the distance from the surface hardness up to the layer HV1158; thickness of 4.8 μm after nitriding of a Ti film , near the surface of the nano - hardness up 12.374GPa , the modulus of elasticity of up to 211.73GPa . Aluminum alloy plated infiltration composite modified wear rate than the untreated state decreased slightly lower coefficient of friction , wear resistance is increased ; thickness of 6.33μm coated with titanium aluminum alloy modified after the lowest wear rate , untreated aluminum alloy compared to the wear rate , a decrease of 64.7% .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology
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