Abstract
Abstract Diecastings of the A356 aluminum alloy were produced by rheo-diecasting (RDC) and High pressure die casting (HPDC), the microstructures of primary solidification, secondary solidification and eutectic Si of diecastings with different pouring temperature were explored and the mechanical properties of different parameters were tested. The result shows that the primary α-Al grains in RDC with self-inoculation method (SIM) are smaller and rounder than the dendrite structure in HPDC. During the RDC process, the amount of primary α-Al grains, average grain size and the lamellar spacing of the eutectic Si increase with the decrease of the melt treatment temperature. While the average grain size and the shape factor are gradually increasing with the increase of melt treatment temperature. As a result, RDC can significantly improve the mechanical properties of the A356 aluminum alloy compared with HPDC, the mechanical properties are optimal at 600°Cwith the tensile strength and elongation are 268.67MPa and 6.8%, respectively.
Highlights
High pressure die casting (HPDC) is a kind of processing technology for forming metal parts, which applies high pressure to molten metal
In present work, based on the previous researches of semisolid forming[20,21], the RDC of A356 aluminum alloy was conducted combining semisolid slurry preparation by self-inoculation method (SIM) with HPDC. Microstructures of both primary solidification and secondary solidification of diecastings with different pouring temperature were analysed, the different morphology of eutectic Si caused by different pouring temperature was explored, and the mechanical properties of different parameters were tested to investigate the relationship between slurry pouring temperature, solidification behavior of remaining liquid phase and mechanical properties of the final parts
The pouring temperature settings of the A356 aluminum alloy is depend on its solidification curve, which is plotted by theorical values that is measured using Pandat-a thermodynamic calculation software
Summary
High pressure die casting (HPDC) is a kind of processing technology for forming metal parts, which applies high pressure to molten metal. In present work, based on the previous researches of semisolid forming[20,21], the RDC of A356 aluminum alloy was conducted combining semisolid slurry preparation by SIM with HPDC. Microstructures of both primary solidification and secondary solidification of diecastings with different pouring temperature were analysed, the different morphology of eutectic Si caused by different pouring temperature was explored, and the mechanical properties of different parameters were tested to investigate the relationship between slurry pouring temperature, solidification behavior of remaining liquid phase and mechanical properties of the final parts
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
