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Student Number 943403025
Author Chih-Ting Wu(§d§Ó®x)
Author's Email Address vincentwu555@yahoo.com.tw
Statistics This thesis had been viewed 830 times. Download 5 times.
Department Mechanical Engineering
Year 2010
Semester 2
Degree Ph.D.
Type of Document Doctoral Dissertation
Language English
Title Effects of Cu, Mg contents and heat treatment on tensile, thermal stability and
wear properties of Al-14.5Si-Cu-Mg alloys
Date of Defense 2011-07-15
Page Count 203
Keyword
  • Cu and Mg contents
  • Heat treatment
  • Hypereutectic
  • Iron-bearing phase
  • Tensile properties
  • Thermal stability
  • Wear
  • Abstract Three Al-14.5Si-Cu-Mg alloys with different copper and magnesium contents were prepared to investigate the effects of copper, magnesium contents and heat treatment on tensile, thermal stability and wear properties of Al-14.5Si-Cu-Mg alloys. The results indicated that the low copper to magnesium ratio alloy contained Al8Mg3FeSi6 and high copper to magnesium ratio alloy contained the acicular £]-Al5FeSi. The tensile strength and elongation of the low copper to magnesium ratio alloy is superior to those of the high copper to magnesium ratio alloy. The presence of the acicular £]-Al5FeSi and shrinkage porosity caused by acicular £]-Al5FeSi in the high copper to magnesium ratio alloy were responsible for the reduction in tensile strength and elongation.
     Due to its large amount of the hard Al2Cu and Al5Cu2Mg8Si6, the alloy with high copper and high magnesium contents had the highest hardness in as-cast condition. After T6 heat treatment, the hardness of the alloy which contained high copper and low magnesium contents was superior to that of the alloy which contained high copper and low magnesium contents. Adding more magnesium could increase the precipitation of £f¡¦(Al5Cu2Mg8Si6) but it also lowered that of £c¡¦(Al2Cu), decreasing the total precipitation of £f¡¦ and £c¡¦. The £f¡¦ and £c¡¦ strengthening precipitates converted to stable £f and £c phases led to a severe decrease in hardness following isothermal heat treatment at 300¢J for 100h. The thermal stability of the T6 heat-treated alloys was much worse than that of the as-cast alloys. In addition, increasing copper content could enhance the hardness of as-cast and T6 heat treated alloys after isothermal heat treatment. This result could not be obtained by increasing magnesium content.
     The specimens were isothermally heat-treated prior to wear test. The type of wear was abrasive wear under 10N applied load and adhesive wear was observed under 40N applied load. The wear rate markedly increased with increasing applied load. The T6 heat-treated alloy with low copper and low magnesium contents had highest wear rate; the as-cast alloy with high copper and high magnesium contents had the lowest wear rate. The wear rate decreased with the increase in the hardness. Increasing copper content could lower wear rate. The wear resistance of the as-cast alloys was better than that of the T6 heat-treated alloys.
    Table of Content ABSTRACT (in Chinese)               I
    ABSTRACT (in English)               II
    ACKNOWLEDGMENT                  IV
    CONTENTS                     V
    TABLE CAPTIONS                  VIII
    FIGURE CAPTIONS                  X
    1.INTRODUCTION
    1.1Background                   1
    1.2 Literature Survey               3
    1.3 Motivation of the Present Study        6
    2.THEORETICAL DEVELOPMENT
    2.1 Characteristics of Precipitation
    Hardened Aluminum alloys             15
    2.2 Precipitation of Al-Si-Cu-Mg alloys      16
    2.3 Intermetallic Compounds in Al-Si-Cu-Mg Alloy                       17
    2.4 Tensile Properties              18
    2.5 Thermal Stability               19
    2.6 Wear                     19
    3.EXPERIMENTAL PROCEDURE
    3.1 Alloy Preparation and Casting         21
    3.2 Heat Treatment                21
    3.3 Metallography                 22
    3.4 SEM/EPMA                   22
    3.5 Differential Scanning Calorimetry       22
    3.6 Electrical Conductivity            23
    3.7 Hardness                   23
    3.8 Tensile Testing                23
    3.9 Thermal stability Testing           23
    3.10 Wear Testing                 24
    4. MICROSTRUCTURE ANALYSIS
    4.1 Microstructure                31
    4.2 EPMA                     33
    4.3 Differential Scanning Calorimetry       36
    4.4 Electrical Conductivity            37
    4.5 Summary                    39
    5.TENSILE PROPERTIES
    5.1 Tensile Properties              51
    5.2 Fracture Surface Observations         52
    5.3 Summary                    55
    6. THERMAL STABILITY
    6.1 As-cast alloys                65
    6.2 T6 heat-treated alloys            67
    6.3 Summary                    71
    7. WEAR PROPERTIES
    7.1 As-Cast Alloys                83
    7.2 T6 Heat-Treated Alloys            84
    7.3 Summary                    87
    8. CONCLUSIONS                  95
    9. SUGGESTED FUTURE WORKS             97
    10. REFERENCES                  98
    11. APPENDIX
    Effects of Cu, Mg contents and heat treatment
    on tensile, thermal stability and wear properties
    of Al-14.5Si-Cu-Mg alloys (in Chinese)      109
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    Advisor
  • Sheng-Long Lee(§õ³Ó¶©)
  • Files
  • 943403025.pdf
  • disapprove authorization
    Date of Submission 2011-08-22

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