Investigation of microstructure and mechanical properties of Al-2Ni-xMn alloys as substitute for hypoeutectic Al-4Ni alloy

Document Type : Original Research Article

Authors

1 MSc Graduated Student, , Department of Metallurgy and Materials Engineering, Imam Khomeini International University, Qazvin, Iran

2 Associate Professor, Department of Metallurgy and Materials Engineering, Imam Khomeini International University, Qazvin, Iran

3 Professor, Department of Metallurgy and Materials Engineering, Imam Khomeini International University, Qazvin, Iran

10.22034/frj.2021.303426.1138

Abstract

In the current study the microstructure and mechanical properties of Al-2Ni-xMn alloys was investigated as a substitute for Al-4Ni alloys. To this end, different melts containing 2 wt. % Ni and 1, 2, and 4 wt. % Mn were solidified at two cooling rates of 3.5 and 10.4 C/s. According to the results, under the low solidification rate, the tensile strength, fracture strain, and toughness of Al-2Ni-1Mn alloy are lower than those of Al-4Ni alloy by 26, 115, and 137%, respectively. However, further Mn addition impaired the tensile properties. Increasing the solidification cooling rate decreases the size and improves the distribution of Ni(Mn)-rich compounds and porosities within the microstructure and reduces the sizes of secondary dendrite arm spacing and grains. This substantially improved the mechanical properties of Mn-rich alloys. For instance, compared to Al-4Ni alloy solidified at 3.5 C/s, the tensile strength, fracture strain, and toughness of copper mold cast Al-2Ni-1Mn alloy increased by 50, 200, and 330%, respectively.

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References

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History

  • Receive Date: 06 September 2021
  • Revise Date: 01 October 2021
  • Accept Date: 07 November 2021

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