NDLI: Heat Treatment Influencing Porosity and Tensile Properties of Field Assisted Sintered AlSi7Mg0.6

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Heat Treatment Influencing Porosity and Tensile Properties of Field Assisted Sintered AlSi7Mg0.6

Content Provider	MDPI
Author	Hirsch, Sarah Johanna Winter, Lisa Grund, Thomas Lampke, Thomas
Copyright Year	2022
Description	In this study, an attempt was made to improve the mechanical properties and in particular the strength of a precipitation-hardenable aluminum alloy while still maintaining high ductility. For this purpose, AlSi7Mg0.6 (A357) powder with an average particle diameter of $d_{50}$ = 40 µm was consolidated using field assisted sintering technique (FAST), and two material conditions were compared: an as-sintered and an underaging heat treated condition (T61). Mechanical properties were determined using tensile tests and hardness measurements. In addition, the microstructure was investigated by optical microscopy. Further, porosity and density were analyzed after the different heat treatments. By the underaging heat treatment, the surface hardness was increased by 100% and the yield strength was increased by 80% compared to the as-sintered material. However, the elongation to failure dropped to one third of that of the as-sintered material. Presumably, this effect was a result of an increased porosity due to the heat treatment. It is assumed that the observed pores were generated by artefacts from the FAST process used to manufacture the samples. The internal gas pressure and equilibrium diffusion supported by heat treatment temperature, and the reduction in surface energy caused by coalescent micropores, led to the enlargement of previously undetectable inhomogeneities in the as-sintered material that resulted in pores in the heat-treated sintered alloy.
Starting Page	2503
e-ISSN	19961944
DOI	10.3390/ma15072503
Journal	Materials
Issue Number	7
Volume Number	15
Language	English
Publisher	MDPI
Publisher Date	2022-03-29
Access Restriction	Open
Subject Keyword	Materials Manufacturing Engineering Field Assisted Sintering Technique A357 Aluminum Alloy Mechanical Properties Microstructure Porosity
Content Type	Text
Resource Type	Article

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