Outline

  • Abstract
  • Keywords
  • 1 Introduction
  • 2 Experimental Procedures
  • 3 Results and Discussion
  • 3.1 Microstructure
  • 4 Mechanical Properties
  • 4.1 Tensile Strength and Elongation
  • 5 Conclusion
  • References

رئوس مطالب

  • چکیده
  • 1. مقدمه
  • 2. روندهای تجربی
  • 3. نتایج و بحث
  • 3.1. میکرو ساختار
  • 4. خواص مکانیکی
  • 4.1. استحکام کشش و کشیدگی
  • 5. نتیجه گیری

Abstract

In this study, aluminum metal matrix composites reinforced with ZrO2 (Zirconium dioxide) nano-particles in volume fraction of 0.5, 0.75 and 1 % were manufactured through accumulative roll bonding (ARB) process. The results of composite microstructure indicated excellent ZrO2 particle distribution in the Al matrix after 10 cycles of ARB process. The X-ray diffraction results also showed that nanostructured Al/ZrO2 nanoparticles composite with the average crystallite size of 48.6 nm was successfully achieved after 10 cycles of ARB process. The tensile tests were conducted on the ARBed strips. The tensile strength increased 2.15 times more than the initial value. The elongation dropped abruptly at the first cycle, and then increased slightly. The SEM images observations from the fracture surface showed that after 10 cycles of ARB process the fracture was almost shear fracture mode with fine and stretched pores.

Keywords: - - - -

Conclusions

Al/Nano-ZrO2 composites manufactured through 10 cycles of cold roll-bonding process, which was an attempt to use pure metal particle-reinforced AMMCs. The microstructure and mechanical properties of the composites were investigated. The conclusions could be summarized as follows:

1. Proper distribution of ZrO2 reinforcing particles in aluminum was obtained after 10 cycles of ARB process.

2. The strength of the composite increased during ARB process. The strength of the specimen with 1 vol% ZrO2 reached to 191.5 MPa which was 2.15 times higher than non-ARB aluminum sheet.

3. Elongation of the composite decreased in the first cycles and then increased as the ARB process progressed. Finally, the elongation for in 0.5, 0.75 and 1.0 vol% obtained 10.8, 10.2 and 8.6 %, respectively.

4. XRD analysis results for the specimens showed that the crystallite size after 10 cycles of ARB process in the specimen with 0.5, 0.75 and 1.0 vol% ZrO2 was 85.5, 55.7 and 48.6 nm, respectively.

5. SEM images observations from the fracture surface showed that after 10 cycles of ARB process the fracture was almost shear fracture mode with fine and stretched pores.

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