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| Effect of Sn content on microstructure and mechanical properties of Al-Mg alloy
for automotive powder injection molding |
| MEN Dianyong1，LI Minggang2 |
| 1College of Intelligent Manufacturing and Automobile, Neijiang Vocational and Technical College,Neijiang
641000, China;2College of mechanical engineering, Sichuan university, Chengdu 610065, China |
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Abstract The Al-Mg alloy for automotive lightweight were prepared by the powder injection molding. The effects
of Sn content and solution treatment on microstructure and mechanical properties of Al-Mg alloy were studied.
The results show that the density of Al-Mg alloy sintered at 600~620 ℃ is higher than 98%. With the increasing
of Sn content, the density of Al-Mg alloy increases monotonically. When the Sn content is greater than 1%, the
increase is not obvious. At this time, more white particles are formed in the grain boundary area, mainly Sn accumulation.
Sn element can play a greater mechanical strengthening effect in the solution treatment process, the solution
treatment can significantly improve the tensile strength of Al-Mg alloy. The tensile strength of solid solution alloy
increases first and then decreases with the increasing of Sn amount. When 1% Sn is added, the tensile strength
reaches the maximum. The pore structure are formed in the solid solution tissues, and the spots phenomenon are appeared,
and the number of spots decreased with the increase of Sn content. When the amount of Sn is less than 1%,
higher mechanical strength can be obtained, but too much Sn will cause the decreasing of mechanical strength of
aluminum alloy.
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Received: 23 December 2019
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2021, Vol. 31 
