Dissertation > Excellent graduate degree dissertation topics show

The Mutual Effects between Heat Treatment & Microarc Oxidation of AZ91D Magnesium Alloy with Permanent Mold Cast

Author: WangYongXin
Tutor: MaYing
School: Lanzhou University of Technology
Course: Materials Processing Engineering
Keywords: Metal AZ91D magnesium alloy Solution treatment Part of the solid solution Aging treatment Micro-arc oxidation Interactions
CLC: TG136.1
Type: Master's thesis
Year: 2008
Downloads: 175
Quote: 0
Read: Download Dissertation

Abstract


The subject combination AZ91D magnesium alloy heat treatment process of micro-arc oxidation process focuses on the interaction of metal AZ91D magnesium alloy heat treatment process of micro-arc oxidation process combination. Metal AZ91D magnesium alloy by the solid solution treatment at 415 ℃ after 24 hours, hard and brittle β phase dissolved in the matrix phase to form a supersaturated solid solution, the hardness of the material is decreased, increased strength and elongation. And then by 200 ° C to the artificial aging treatment for 16 hours, re-precipitation of the β-phase so that the material hardness, strength is improved, but the expense of some ductility. \In the case of the degree of improvement on the material properties is not strictly required, the use of the \\The same micro-arc oxidation process conditions, different heat treatment conditions of metal AZ91D magnesium alloy micro-arc oxidation film surface morphology, composition, phase composition remains unchanged. AZ91D magnesium alloy micro-arc oxidation is constantly out spray deposition process of gradual growth, the film surface hole injection and sediment particles gradually coarsening, while accumulation of a variety of internal stress and crack initiation. Solution treatment AZ91D magnesium alloy elements can be distributed evenly, reducing the accumulation of internal stress in the film, and bring a better film effect, and reduces the energy consumption of the micro-arc oxidation. The aging process does not change the quality of micro-arc oxidation ceramic injection sediment, but will cause a slow release of internal stress, causing a slight expansion of the surface crack. A solution and aging state-based micro-arc oxidation film thickness values ??to deal with the same time in the same electrical parameters is always smaller than the cast matrix and solid solution state matrix, its roughness is always the same electrical parameters of the same thickness between cast matrix and solid between dissolved state matrix. The micro-arc oxidation does not lead to a change of the metal AZ91D magnesium alloy matrix organization. MAO coatings matrix strengthening effect, but the strengthening effect. Matrix of the solid solution state micro-arc oxidation treatment, matrix tensile strength, once raised to the level of T61 treatment, but certain film thickness crack changes began to weaken this enhanced role. The elongation changes also first increased, then decreased. Aging treatment will have a solid solution after micro-arc oxidation state matrix, the internal stress in the film slow release material tensile strength gradually decreases with the thickening of the micro-arc oxidation film elongation slight fluctuations up and down. Micro-arc oxidation solution and aging heat treatment matrix tensile strength and elongation. Micro-arc oxidation film under tensile stress showing a layered fracture characteristics: dense layer has a certain toughness, well bonded to the substrate; loose layer of toughness, showing flaking characteristics.

Related Dissertations

  1. Preparation of Micro-Arc Oxidation Ceramic Coating on Mg Alloy and the Research of Galvanic Corrosion,TG174.453
  2. Study on the Hot Deformation Behaviour and Microstructure of GH600,TG132.32
  3. Preparation, Characterization and Performance of the Bio-coatings on the Surface of Pure Titanium Based on Micro Arc Oxidation,R318.08
  4. Study on the Management Model of Shandong Cultural Industry,G124
  5. Function Analysis of BL0033 and BL0034 in Fructose ABC Transporter System of Bifidobacterium Longum,Q935
  6. Electronic shell material magnesium alloy micro-arc oxidation and subsequent treatment process research,TG174
  7. Study on the High Temperature Brittleness and Optimization of Solution Treatment Temperature of Maraging Stainless Steel,TG142.71
  8. The Effect of Heat Treatment Processes on Microstructures and Properties of the Spray-deposition Ultrahigh Strength Aluminum Containing Sc,TG113
  9. Confirmation and Functional Exploration of the Interaction between Angiogenin and Fibulin Protein Family,R735.3
  10. Effects of Combined Oral Contraceptives Use, Dyslipidemia, Hereditary Susceptibility on the Risk of Hypertension in Women,R544.1
  11. Osseointegration of AZ91D Magnesium Alloy Modified by Micro-arc Oxidation of Osteoblast,TG174.451
  12. Effect of Grain Size on Behaviors of Solid Solution and Aging Treatment for AZ91 Alloy,TG156.92
  13. Study of Heat Treatment and Properties of Al-Mg-Si-Cu Based Aluminum Alloy Sheets,TG166.3
  14. Fabrication and Biocharacter of Composite Coating on Mg-Zn Based Alloy,TG174.4
  15. Surface Modification of ZK60 Mg Alloy by High Current Pulsed Electron Beam and/or MAO,TG174.4
  16. Research on Formation and Preparation of Materials of Magnesium Alloy Based on Biological Medical,TG146.22
  17. Study on Heat Treatments for High Strength 7475 Aluminum Alloy,TG166.3
  18. AZ91D magnesium alloy micro-arc oxidation Jin Duicheng bone cell adhesion , proliferation and ALP activity,R318.08
  19. Studies on Preparation and Properties of Micro-arc Oxidation Coating on Biomedical AZ31B Magnesium Alloy,TG174.4
  20. Fir of growth and environment interaction process visualization simulation study,S791.27
  21. Anti-Wear Ceramic Coating Prepared on the Surface of AZ31 Magnesium Alloy,TG174.453

CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > The alloy learn with a variety of properties of alloys > Special arts and crafts nature of the alloy > Casting alloys
© 2012 www.DissertationTopic.Net  Mobile